Xamarin.Android.Build.Tasks:_Foo - Set Inputs and Outputs to fix .. #8
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.. incremental builds.
| <_SharedRuntimeAssemblies Include="@(SharedRuntimeBuildPath->'%(Identity)\\v1.0\*.dll');@(SharedRuntimeBuildPath->'%(Identity)\\v6.0\*.dll')"/> | ||
| </ItemGroup> | ||
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| <Target Name="_Foo" BeforeTargets="CoreCompile" |
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We really shouldn't call this target _Foo. Please rename to a better name. :-)
|
I had to create a new fork, thus a new PR :/ Closing this. |
radical
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Context: dotnet/java-interop#2 Context: dotnet/java-interop#8 From Issue #8: > I don't like JniMarshalInfo; it's too convoluted, makes the > simple cases hard. What do we mean by "hard"? We mean that it's use is error prone, because what you need to do depends on the values of the JniMarshalInfo members, which is best characterized by what JniArgumentMarshalInfo had to do to create a JNI Local refererence: JniObjectReference lref; var marshaler = JniRuntime.CurrentRuntime.ValueManager.GetJniMarshalInfoForType (type); if (info.CreateMarshalCollection != null) { var obj = info.CreateMarshalCollection (value); lref = obj.PeerReference; } else if (info.CreateLocalRef != null) { lref = info.CreateLocalRef (value); } else throw new NotSupportedException ("Don't know how to get a JNI Local Reference!"); // can now use `lref`... Need to pass as a method argument? Similar-yet-different. Then there's the cleanup code! The eventual intention is for tools/jnimarshalmethod-gen to post-process assemblies and generate Java > Managed marshal methods for all resolvable methods, and do this "dynamically" based on the actual types involved. This will allow "fixing" binding assemblies when involved types change, because binding assemblies won't be as "static" as they are in Xamarin.Android. (Which is why Issue #8 mentions using Expressions for the marshaling.) However, before we can get there we first need a rational marshaling abstrasction, something that is "pluggable" and readily extensible, so taht we can e.g. have a custom attribute to control which marshaler to use on types, parameters, and method return types. JniMarshalInfo wasn't that abstraction, and couldn't *be* that abstraction. To replace JniMarshalInfo, introduce JniValueMarshaler and JniValueMarshler<T>: public abstract partial class JniValueMarshaler { public abstract object CreateValue (ref JniObjectReference reference, JniObjectReferenceOptions options, Type targetType = null); public virtual JniValueMarshalerState CreateArgumentState (object value, ParameterAttributes synchronize = 0); public abstract JniValueMarshalerState CreateObjectReferenceArgumentState (object value, ParameterAttributes synchronize = 0); public abstract void DestroyArgumentState (object value, ref JniValueMarshalerState state, ParameterAttributes synchronize = 0); } public abstract partial class JniValueMarshaler<T> : JniValueMarshaler { public abstract T CreateGenericValue (ref JniObjectReference reference, JniObjectReferenceOptions options, Type targetType = null); public virtual JniValueMarshalerState CreateGenericArgumentState (T value, ParameterAttributes synchronize = 0); public abstract JniValueMarshalerState CreateGenericObjectReferenceArgumentState (T value, ParameterAttributes synchronize = 0); public abstract void DestroyGenericArgumentState (T value, ref JniValueMarshalerState state, ParameterAttributes synchronize = 0); public override object CreateValue (ref JniObjectReference reference, JniObjectReferenceOptions options, Type targetType = null); public override JniValueMarshalerState CreateArgumentState (object value, ParameterAttributes synchronize = 0); public override JniValueMarshalerState CreateObjectReferenceArgumentState (object value, ParameterAttributes synchronize = 0); public override void DestroyArgumentState (object value, ref JniValueMarshalerState state, ParameterAttributes synchronize = 0); } The intention is that a custom marshaler can be introduced by inheriting from JniValueMarshaler<T> and overriding three methods. This also provides a reasonable abstraction, e.g. to create a JNI Local Reference: var state = marshaler.CreateGenericObjectReferenceArgumentState (value); // state.ReferenceValue contains a JNI Object Reference // use, then cleanup: marshaler.DestroyGenericArgumentState (value, ref state); The methods are as follows: * CreateValue, CreateGenericValue: Java > Managed marshaler. Given a JniObjectReference, marshal the value to a type compatible with specified targetType, which should be either null or a class assignment compatible to T. The other methods use a JniValueMarshalerState type: public partial struct JniValueMarshalerState { public JniArgumentValue JniArgumentValue {get;} public JniObjectReference ReferenceValue {get;} public IJavaPeerable PeerableValue {get;} } The remaining methods of import are: * CreateArgumentState(), CreateGenericArgumentState(): Managed > Java marshaler. Used when the intention is to use JniValueMarshalerState.JniArgumentValue, which in turn is for use with JniEnvironment.*Methods.Call*Method(). * CreateObjectReferenceArgumentState(), CreateGenericObjectReferenceArgumentState(): Managed > Java marshaler. Used when the intention is to use JniValueMarshalerState.ReferenceValue. * DestroyArgumentState(), DestroyGenericArgumentState(): Generic resource cleanup mechanism for use with Create*ArgumentState(). The primary difference between Create*ArgumentState() and Create*ObjectReferenceArgumentState() is with builtin value types, e.g. `int`. Create*ArgumentState() will *only* provide a JniArgumentValue, while JniValueMarshalerState.ReferenceValue will be null. Create*ObjectReferenceArgumentState(), meanwhile, will "box" the value type, providing a valid JniValueMarshalerState.ReferenceValue. For all other types, these methods are identical. JniValueMarshaler and JniValueMarshalerState together combine to replace JniMarshalInfo and JniArgumentMarshalInfo, the latter of which (1) wasn't public, and (2) was "duplicated" between the generic marshalers and Java.Interop.Dynamic. JniValueMarshaler thus allows cleaning up this duplication. Along with the new JniValueMarshaler abstraction, we provide implementations for all builtin types, Nullable<T> for builtin types (which always box), arrays of the builtin types, JavaObjectArray<T>, IJavaPeerable, and `object`. The `object` marshaler supersedes the previous JniMarshal.GetValue<T>() semantics, using JavaProxyObject as needed. One thing to note is the ParameterAttributes parameters. This value is intended to correspond with System.Reflection.ParameterInfo.Attributes. jnimarshalmethod-gen can thus use the actual MethodInfo + ParameterInfo to encode parameter marshaling direction. For most types this won't be useful; this is largely intended for *arrays*, e.g. we could have an `[In] int[]` parameter which thus avoids the "copy out" behavior Xamarin.Android currently performs, thus avoiding an extra JNI transition. Or vice-versa, have an `[Out] int[]` parameter, which avoids a JNI transition to copy the managed `int[]` to the Java `int[]`, replacing it with the copy-out transition. Partially addressing Issue #2, this also introduces JniRuntime.JniValueManager.GetValue() and GetValue<T>() methods. GetObject() is not yet replaced, but will be in a future commit. Actual implementation will be done alongside introduction of CreateValue<T>() and cleaning up JniValueMarshaler.Create*Value() methods to always create values when able, simplifying the logic if JniValueMarshaler implementations.
radical
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May 8, 2018
Fixes: dotnet/java-interop#8 Extend the JniValueMarshaler abstraction from commit 77a6bf8 so that JniValueMarshaler can *also* marshal from/to Java via System.Linq.Expressions expression trees: partial class JniValueMarshaler { public virtual Type MarshalType {get;} public virtual Expression CreateParameterToManagedExpression (JniValueMarshalerContext context, ParameterExpression sourceValue, ParameterAttributes synchronize, Type targetType); public virtual Expression CreateParameterFromManagedExpression (JniValueMarshalerContext context, ParameterExpression sourceValue, ParameterAttributes synchronize); public virtual Expression CreateReturnValueFromManagedExpression (JniValueMarshalerContext context, ParameterExpression sourceValue); } The members: * MarshalType: The JNI type that this marshaler marshals from/to. The default value is typeof(IntPtr), making it suitable for marshaling reference types. * CreateParameterToManagedExpression(): Java > Managed marshaler. Convert the Java parameter `sourceValue`, of type `MarshalType`, to the managed type `targetType`. * CreateParameterFromManagedExpression(): Managed > Java marshaler. Convert the managed parameter `sourceValue` to `MarshalType`. * CreateReturnValueFromManagedExpression(): Managed > Java marshaler, for return values (not parameters). Convert the managed parameter `sourceValue` to `MarshalType`, suitable for use when returning to Java. The default implementation of these methods uses the marshaling behavior provided by the abstract JniValueMarshaler.CreateValue(), JniValueMarshaler.CreateArgumentState(), and JniValueMarshaler.DestroyArgumentState() methods. CreateParameterToManagedExpression() uses CreateValue(), while CreateParameterFromManagedExpression() and CreateReturnValueFromManagedExpression() uses both CreateArgumentState() and DestroyArgumentState() to marshal values. The purpose of using expression trees is to permit optimizations: Java.Interop.ExportedMemberBuilder uses expression trees in order to generate the Java > Managed marshaling code, so by extending JniValueMarshaler to use expression trees it's possible to use a smarter marshaling algorithm for specific types. For example, the builtin types don't need to do *anything*, as they're binary compatible with the JNI types. Conseequently, they only need to return the source parameter, instead of actually using JniValueManager.CreateValue()/etc. Similarly, the IJavaPeerable value marshaler can directly use JniRuntime.JniValueManager.GetValue<T>() for Java > managed marshaling and IJavaPeerable.PeerReference for Managed > Java marshaling. Finally, this doesn't *fully* fix Issue #8, but it fixes "enough" to close the issue. What's missing, but can be done later, is: > Do in conjunction w/ Java.Interop.Dynamic While Java.Interop.Dynamic can (should!) use JniValueManager.CreateParameterFromManagedExpression(), it doesn't currently because it doesn't even perform the JNI invocation via expression trees; it uses expression trees to invoke the intermediate helper method JavaClassInfo.TryInvokeMember(). This can be fixed, but doesn't need to be done yet. > Need to permit use of custom attributes on return types, parameter > types, "inline" into marshal methods. This will be done in a separate commit for a JniValueManagerAttribute custom attribute. (Let's try to keep commits single purpose, right?) > Use Expression<TDelegate> to make it easier to write marshalers. This isn't needed for the currently supported marshalers.
radical
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Mentioned in ff4053c was a feature to complete Issue #8: > Need to permit use of custom attributes on return types, parameter > types, "inline" into marshal methods. Let's do that. :-) The new Java.Interop.JniValueMarshalerAttribute custom attribute can be applied to: * Types: classes, enums, interfaces, structs This allows: [JniValueMarshaler (typeof (MyCustomMarshaler))] public class MySpecialClass /* NOT JavaObject! */ { } public partial class MyCustomMarshaler : JniValueMarshaler<MySpecialClass> { // ... } JniRuntime.JniValueManager.GetValueMarshaler(Type) has been updated to check for the JniValueMarshalerAttribute and, when present, will return a new instance of the specified JniValueMarshaler instance: var marshaler = JniRuntime.CurrentRuntime.ValueManager.GetValueMarshaler (typeof (MySpecialClass)); // marshaler ISA MyCustomMarshaler JniValueMarshalerAttribute can also be applied to: * Method parameters * Method return types Java.Interop.Export has been updated to check for the JniValueMarshalerAttribute custom attribute to marshal parameters and return types, allowing: // e.g. code from an existing library public class ExistingType { } public partial class ExistingTypeValueMarshaler : JniValueMarshaler<ExistingType> { // ... } [JavaCallable] public static [return: JniValueMarshaler (typeof (ExistingTypeValueMarshaler))] ExistingType Foo ([JniValueMarshaler (typeof (ExistingTypeValueMarshaler))] ExistingType value) { return value; } This allows one-off specification or overriding of value marshalers for method parameter and return types, particularly useful if you want to marshal a type that you don't control, and thus can't alter to contain a [JniValueMarshaler] declaration.
radical
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When `JniRuntime.CreationOptions.DestroyRuntimeOnDispose` is true,
`JavaVM::DestroyJavaVM()` will be invoked when the `JniRuntime`
instance is disposed *or* finalized.
`JreRuntime.CreateJreVM()` would *always* set
`DestroyRuntimeOnDispose` to true, because it called
`JNI_CreateJavaVM()`, so *of course* you'd want to destroy the
Java VM, right?
Which brings us to unit tests. I don't know of any "before all test
fixtures run" and "after all test fixtures run" extension points,
which means:
1. The JVM needs to be created implicitly, "on demand."
2. There's no good way to destroy the JVM created in (1) after all
tests have finished executing.
Which *really* means that the `JreRuntime` instance is *finalized*,
which sets us up for the unholy trifecta of AppDomain unloads,
finalizers, and JVM shutdown:
For unknown reasons, ~randomly, when running the unit tests (e.g.
`make run-tests`), the test runner will *hang*, indefinitely.
Attaching `lldb` and triggering a backtrace shows the unholy trifecta:
Finalization:
thread #4: tid = 0x403831, 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'tid_1403'
...
frame #10: 0x00000001001ccb4a mono64`mono_gc_run_finalize(obj=<unavailable>, data=<unavailable>) + 938 at gc.c:256 [opt]
frame #11: 0x00000001001cdd4a mono64`finalizer_thread [inlined] finalize_domain_objects + 51 at gc.c:681 [opt]
frame #12: 0x00000001001cdd17 mono64`finalizer_thread(unused=<unavailable>) + 295 at gc.c:730 [opt]
JVM destruction:
thread #4: tid = 0x403831, 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'tid_1403'
frame #0: 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fffa04d4728 libsystem_pthread.dylib`_pthread_cond_wait + 767
frame #2: 0x000000010ba5bc76 libjvm.dylib`os::PlatformEvent::park() + 192
frame #3: 0x000000010ba38e32 libjvm.dylib`ParkCommon(ParkEvent*, long) + 42
frame #4: 0x000000010ba39708 libjvm.dylib`Monitor::IWait(Thread*, long) + 168
frame #5: 0x000000010ba398f0 libjvm.dylib`Monitor::wait(bool, long, bool) + 246
frame #6: 0x000000010bb3dca2 libjvm.dylib`Threads::destroy_vm() + 80
frame #7: 0x000000010b8fd665 libjvm.dylib`jni_DestroyJavaVM + 254
AppDomain unload:
thread #37: tid = 0x4038fb, 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #0: 0x00007fff9656bdb6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fffa04d4728 libsystem_pthread.dylib`_pthread_cond_wait + 767
frame #2: 0x0000000100234a7f mono64`mono_os_cond_timedwait [inlined] mono_os_cond_wait(cond=0x0000000102016e50, mutex=0x0000000102016e10) + 11 at mono-os-mutex.h:105 [opt]
frame #3: 0x0000000100234a74 mono64`mono_os_cond_timedwait(cond=0x0000000102016e50, mutex=0x0000000102016e10, timeout_ms=<unavailable>) + 164 at mono-os-mutex.h:120 [opt]
frame #4: 0x0000000100234828 mono64`_wapi_handle_timedwait_signal_handle(handle=0x0000000000000440, timeout=4294967295, alertable=1, poll=<unavailable>, alerted=0x0000700000a286f4) + 536 at handles.c:1554 [opt]
frame #5: 0x0000000100246370 mono64`wapi_WaitForSingleObjectEx(handle=<unavailable>, timeout=<unavailable>, alertable=<unavailable>) + 592 at wait.c:189 [opt]
frame #6: 0x00000001001c832e mono64`mono_domain_try_unload [inlined] guarded_wait(timeout=4294967295, alertable=1) + 30 at appdomain.c:2390 [opt]
frame #7: 0x00000001001c8310 mono64`mono_domain_try_unload(domain=0x000000010127ccb0, exc=0x0000700000a287a0) + 416 at appdomain.c:2482 [opt]
frame #8: 0x00000001001c7db2 mono64`ves_icall_System_AppDomain_InternalUnload [inlined] mono_domain_unload(domain=<unavailable>) + 20 at appdomain.c:2379 [opt]
frame #9: 0x00000001001c7d9e mono64`ves_icall_System_AppDomain_InternalUnload(domain_id=<unavailable>) + 46 at appdomain.c:2039 [opt]
This randomly results in deadlock, and hung Jenkins bots.
Fix this behavior by altering `JreRuntime.CreateJreVM()` to *not*
override the value of
`JniRuntime.CreationOptions.DestroyRuntimeOnDispose`. This allows the
constructor of the `JreRuntime` instance to decide whether or not the
JVM is destroyed.
In the case of TestJVM, we *don't* want to destroy the JVM.
This prevents the JVM from being destroyed, which in turn prevents the
hang during process shutdown.
grendello
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Jul 18, 2018
Xamarin.Android uses the ILRepack task (https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task/) to repack/merge the `Xamarin.Android.Build.Tasks` assembly, a step that is performed after the `Xamarin.Android.Build.Tasks` project build completes. The step takes the project's output assembly and several other dependencies and merges them into one, replacing the original output assembly. For the majority of time it works flawlessly, however the scenario described below causes a Mono runtime crash (similar to this one mono/mono#9613, although not identical). The crash causes aren't yet know in every detail, but the high level overview of the issue is as follows. Mono runtime uses the `mmap(2)` system call on Unix to map the on-disk image of the assembly into memory. The mmapped area is used whenever the same assembly is loaded (e.g. via `Assembly.LoadFrom`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction - when an external process (or even the same Mono process) writes to the file that was mmapped. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard - the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored, on Linux, however, the write leads either to the SIGBUS signal being sent to the process or corruption to the mmapped memory area (details of how this happens are, as of yet, unknown - it's just a theory at this point). The problem occurs in our case when the `ILRepacker` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually leading to a segfault: #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 dotnet#4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 dotnet#5 <signal handler called> dotnet#6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 dotnet#7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 dotnet#8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 dotnet#9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 dotnet#10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 dotnet#11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 dotnet#12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 dotnet#13 0x00000000412f4007 in ?? () dotnet#14 0x00007f97440e1918 in ?? () dotnet#15 0x00007f9749bd1800 in ?? () dotnet#16 0x00000000e36e75af in ?? () dotnet#17 0x00007f974434fda8 in ?? () dotnet#18 0x00007f9749bd18e0 in ?? () dotnet#19 0x00007f96e0002820 in ?? () dotnet#20 0x00007f9712164160 in ?? () dotnet#21 0x00007f9712164010 in ?? () dotnet#22 0x0000000000000000 in ?? () The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks` assembbly's mmaped area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The situation can be detected by the runtime by using advisory locks and reporting the attempt to overwrite the mmapped area, however a fix would require creating a copy of all the assembly's in-memory data before the write is allowed and that might be too expensive. None of those measures are currently implemented by Mono (and it isn't sure if any of them will ever be implemented). The crash this commit fixes occurs in a very specific scenario - when building the `OpenTK.csproj` project *directly* (that is passing it as parameter to `msbuild`), which causes a the `Xamarin.Android.Build.Tasks` assembly to be loaded for use in the `<UsingTask/>` msbuild statement, but at the same time `OpenTK.csproj` references the `Xamarin.Android.Build.Tasks` *project* which causes the ILRepacker task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the ILRepacker target not run every time but only whenver the assembly has to be re-packed because it has just been rebuilt.
grendello
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that referenced
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Jul 19, 2018
Xamarin.Android uses the ILRepack task (https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task/) to repack/merge the `Xamarin.Android.Build.Tasks` assembly, a step that is performed after the `Xamarin.Android.Build.Tasks` project build completes. The step takes the project's output assembly and several other dependencies and merges them into one, replacing the original output assembly. For the majority of time it works flawlessly, however the scenario described below causes a Mono runtime crash (similar to this one mono/mono#9613, although not identical). The crash causes aren't yet know in every detail, but the high level overview of the issue is as follows. Mono runtime uses the `mmap(2)` system call on Unix to map the on-disk image of the assembly into memory. The mmapped area is used whenever the same assembly is loaded (e.g. via `Assembly.LoadFrom`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction - when an external process (or even the same Mono process) writes to the file that was mmapped. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard - the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored, on Linux, however, the write leads either to the SIGBUS signal being sent to the process or corruption to the mmapped memory area (details of how this happens are, as of yet, unknown - it's just a theory at this point). The problem occurs in our case when the `ILRepacker` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually leading to a segfault: #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 dotnet#4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 dotnet#5 <signal handler called> dotnet#6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 dotnet#7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 dotnet#8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 dotnet#9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 dotnet#10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 dotnet#11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 dotnet#12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 dotnet#13 0x00000000412f4007 in ?? () dotnet#14 0x00007f97440e1918 in ?? () dotnet#15 0x00007f9749bd1800 in ?? () dotnet#16 0x00000000e36e75af in ?? () dotnet#17 0x00007f974434fda8 in ?? () dotnet#18 0x00007f9749bd18e0 in ?? () dotnet#19 0x00007f96e0002820 in ?? () dotnet#20 0x00007f9712164160 in ?? () dotnet#21 0x00007f9712164010 in ?? () dotnet#22 0x0000000000000000 in ?? () The accompanying managed stacktrace looks as follows: Stacktrace: at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Reflection.Assembly.LoadFrom (string,bool) [0x0001b] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Reflection.Assembly.LoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:539 at System.Reflection.Assembly.UnsafeLoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:571 at Microsoft.Build.Shared.TypeLoader.LoadAssembly (Microsoft.Build.Shared.AssemblyLoadInfo) [0x0001e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes.ScanAssemblyForPublicTypes () [0x00007] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes/<>c__DisplayClass8_0.<GetLoadedTypeByTypeName>b__0 (string) [0x000b4] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Collections.Concurrent.ConcurrentDictionary`2<TKey_REF, TValue_REF>.GetOrAdd (TKey_REF,System.Func`2<TKey_REF, TValue_REF>) [0x00034] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes.GetLoadedTypeByTypeName (string) [0x0003c] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader.GetLoadedType (System.Collections.Concurrent.ConcurrentDictionary`2<System.Func`3<System.Type, object, bool>, System.Collections.Concurrent.ConcurrentDictionary`2<Microsoft.Build.Shared.AssemblyLoadInfo, Microsoft.Build.Shared.TypeLoader/AssemblyInfoToLoadedTypes>>,string,Microsoft.Build.Shared.AssemblyLoadInfo) [0x00042] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Shared.TypeLoader.Load (string,Microsoft.Build.Shared.AssemblyLoadInfo) [0x00008] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.AssemblyTaskFactory.InitializeFactory (Microsoft.Build.Shared.AssemblyLoadInfo,string,System.Collections.Generic.IDictionary`2<string, Microsoft.Build.Framework.TaskPropertyInfo>,string,System.Collections.Generic.IDictionary`2<string, string>,bool,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation,string) [0x00058] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry/RegisteredTaskRecord.GetTaskFactory (Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation,string) [0x000b8] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry/RegisteredTaskRecord.CanTaskBeCreatedByFactory (string,string,System.Collections.Generic.IDictionary`2<string, string>,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation) [0x0003b] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry.GetMatchingRegistration (string,System.Collections.Generic.List`1<Microsoft.Build.Execution.TaskRegistry/RegisteredTaskRecord>,string,System.Collections.Generic.IDictionary`2<string, string>,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation) [0x0001a] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry.GetTaskRegistrationRecord (string,string,System.Collections.Generic.IDictionary`2<string, string>,bool,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation,bool&) [0x00169] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.Execution.TaskRegistry.GetRegisteredTask (string,string,System.Collections.Generic.IDictionary`2<string, string>,bool,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.Construction.ElementLocation) [0x00010] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskExecutionHost.FindTaskInRegistry (System.Collections.Generic.IDictionary`2<string, string>) [0x00038] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.FindTask (System.Collections.Generic.IDictionary`2<string, string>) [0x0000b] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19.MoveNext () [0x0011e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19> (Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TaskBuilder.ExecuteBucket (Microsoft.Build.BackEnd.TaskHost,Microsoft.Build.BackEnd.ItemBucket,Microsoft.Build.BackEnd.TaskExecutionMode,System.Collections.Generic.Dictionary`2<string, string>) [0x00048] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18.MoveNext () [0x0016a] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18> (Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TaskBuilder.ExecuteTask (Microsoft.Build.BackEnd.TaskExecutionMode,Microsoft.Build.BackEnd.Lookup) [0x00037] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13.MoveNext () [0x00193] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13> (Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TaskBuilder.ExecuteTask (Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.BackEnd.BuildRequestEntry,Microsoft.Build.BackEnd.ITargetBuilderCallback,Microsoft.Build.Execution.ProjectTargetInstanceChild,Microsoft.Build.BackEnd.TaskExecutionMode,Microsoft.Build.BackEnd.Lookup,Microsoft.Build.BackEnd.Lookup,System.Threading.CancellationToken) [0x0006c] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52.MoveNext () [0x00091] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.BackEnd.WorkUnitResult>.Start<Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52> (Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:471 at Microsoft.Build.BackEnd.TargetEntry.ProcessBucket (Microsoft.Build.BackEnd.ITaskBuilder,Microsoft.Build.BackEnd.Logging.TargetLoggingContext,Microsoft.Build.BackEnd.TaskExecutionMode,Microsoft.Build.BackEnd.Lookup,Microsoft.Build.BackEnd.Lookup) [0x00051] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45.MoveNext () [0x002bb] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start<Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45> (Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45&) [0x0002c] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:316 at Microsoft.Build.BackEnd.TargetEntry.ExecuteTarget (Microsoft.Build.BackEnd.ITaskBuilder,Microsoft.Build.BackEnd.BuildRequestEntry,Microsoft.Build.BackEnd.Logging.ProjectLoggingContext,System.Threading.CancellationToken) [0x00048] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at Microsoft.Build.BackEnd.TargetBuilder/<ProcessTargetStack>d__21.MoveNext () [0x003a5] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<System.Threading.Tasks.VoidTaskResult>.TrySetResult (System.Threading.Tasks.VoidTaskResult) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<System.Threading.Tasks.VoidTaskResult>.SetResult (System.Threading.Tasks.VoidTaskResult) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<System.Threading.Tasks.VoidTaskResult>.SetResult (System.Threading.Tasks.Task`1<System.Threading.Tasks.VoidTaskResult>) [0x00010] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:636 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.SetResult () [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:378 at Microsoft.Build.BackEnd.TargetEntry/<ExecuteTarget>d__45.MoveNext () [0x00720] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TargetEntry/<ProcessBucket>d__52.MoveNext () [0x001d5] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__13.MoveNext () [0x0021e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteTask>d__18.MoveNext () [0x002be] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteBucket>d__19.MoveNext () [0x003e5] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<InitializeAndExecuteTask>d__24.MoveNext () [0x0012d] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.TaskBuilder/<ExecuteInstantiatedTask>d__26.MoveNext () [0x0065e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<bool>.TrySetResult (bool) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<bool>.SetResult (bool) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.MSBuild/<ExecuteInternal>d__76.MoveNext () [0x004dd] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<bool>.TrySetResult (bool) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<bool>.SetResult (bool) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.MSBuild/<BuildProjectsInParallel>d__77.MoveNext () [0x0014a] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<bool>.TrySetResult (bool) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<bool>.SetResult (bool) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.MSBuild/<ExecuteTargets>d__80.MoveNext () [0x00713] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<Microsoft.Build.Framework.BuildEngineResult>.TrySetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.Framework.BuildEngineResult>.SetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.TaskHost/<InternalBuildProjects>d__49.MoveNext () [0x0025c] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<Microsoft.Build.Framework.BuildEngineResult>.TrySetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<Microsoft.Build.Framework.BuildEngineResult>.SetResult (Microsoft.Build.Framework.BuildEngineResult) [0x0003d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:608 at Microsoft.Build.BackEnd.TaskHost/<BuildProjectFilesInParallelAsync>d__53.MoveNext () [0x004fb] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.RequestBuilder/<BuildProjects>d__33.MoveNext () [0x00263] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<TResult_REF>.TrySetResult (TResult_REF) [0x0004f] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1<TResult_REF>.SetResult (TResult_REF) [0x0003d] in <79002cfb0e6e431d8465d6dcea08995e>:0 at Microsoft.Build.BackEnd.RequestBuilder/<StartNewBuildRequests>d__51.MoveNext () [0x0020e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.InvokeMoveNext (object) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1094 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Runtime.CompilerServices.AsyncMethodBuilderCore/MoveNextRunner.Run () [0x00024] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1075 at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction (System.Action,bool,System.Threading.Tasks.Task&) [0x0001a] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/TaskContinuation.cs:680 at System.Threading.Tasks.Task.FinishContinuations () [0x00052] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:3198 at System.Threading.Tasks.Task.FinishStageThree () [0x0003c] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2247 at System.Threading.Tasks.Task`1<int>.TrySetResult (int) [0x0004f] in /home/grendel/vc/mono/mono/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:433 at System.Threading.Tasks.TaskCompletionSource`1<int>.TrySetResult (int) [0x00000] in /home/grendel/vc/mono/mono/external/corefx/src/Common/src/CoreLib/System/Threading/Tasks/TaskCompletionSource.cs:274 at Microsoft.Build.Shared.AwaitExtensions/<>c__DisplayClass7_2.<ToTask>b__0 (object,bool) [0x00038] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 at System.Threading.RegisteredWaitHandle.DoCallBack (object) [0x00008] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Threading/RegisteredWaitHandle.cs:103 at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context (object) [0x0000d] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:1308 at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00071] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:961 at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/executioncontext.cs:908 at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem () [0x00021] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:1285 at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00074] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:858 at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () [0x00000] in /home/grendel/vc/mono/mono/mcs/class/referencesource/mscorlib/system/threading/threadpool.cs:1213 at (wrapper runtime-invoke) <Module>.runtime_invoke_bool (object,intptr,intptr,intptr) [0x0001f] in <79002cfb0e6e431d8465d6dcea08995e>:0 The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks` assembbly's mmaped area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The situation can be detected by the runtime by using advisory locks and reporting the attempt to overwrite the mmapped area, however a fix would require creating a copy of all the assembly's in-memory data before the write is allowed and that might be too expensive. None of those measures are currently implemented by Mono (and it isn't sure if any of them will ever be implemented). The crash this commit fixes occurs in a very specific scenario - when building the `OpenTK.csproj` project *directly* (that is passing it as parameter to `msbuild`), which causes a the `Xamarin.Android.Build.Tasks` assembly to be loaded for use in the `<UsingTask/>` msbuild statement, but at the same time `OpenTK.csproj` references the `Xamarin.Android.Build.Tasks` *project* which causes the ILRepacker task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the ILRepacker target not run every time but only whenver the assembly has to be re-packed because it has just been rebuilt.
jonpryor
pushed a commit
that referenced
this pull request
Jul 19, 2018
Xamarin.Android uses the [ILRepack task][0] to repack/merge the `Xamarin.Android.Build.Tasks.dll` assembly (610ade7), a step that is performed after the `Xamarin.Android.Build.Tasks.csproj` project's `Build` target completes. The step takes the project's output assembly -- `Xamarin.Android.Build.Tasks.dll` -- and several other dependencies, then merges them into one, *replacing* the original output assembly. The majority of time it works flawlessly, however when building the `monodroid` repo we observe a Mono runtime crash, similar-but-not- identical to [mono issue 9613][m9613]. Not all details are understood, but the high level overview of the issue is as follows: Mono runtime uses the **mmap**(2) system call on Unix to map the on-disk image of the assembly into memory. The `mmapp`ed area is used whenever the same assembly is loaded (e.g. `Assembly.LoadFrom()`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction: when an external process (or even the same Mono process!) writes to the file that was `mmapp`ed. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard: the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored; on Linux, the write leads either to the `SIGBUS` signal being sent to the process or corruption to the `mmap`ped memory area (details of how this happens are, as of yet, unknown; it's just a theory at this point). The problem occurs in our case when the `<ILRepacker/>` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually crashing: ## native crash #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 #4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 #5 <signal handler called> #6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 #7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 #8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 #9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 #10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 #11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 #12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 ... ## managed stacktrace at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Reflection.Assembly.LoadFrom (string,bool) [0x0001b] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Reflection.Assembly.LoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:539 at System.Reflection.Assembly.UnsafeLoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:571 at Microsoft.Build.Shared.TypeLoader.LoadAssembly (Microsoft.Build.Shared.AssemblyLoadInfo) [0x0001e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 ... The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks.dll`s `mmap`ed area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The crash this commit fixes occurs in a very specific scenario: when building the `OpenTK.csproj` project *directly* (e.g. `msbuild OpenTK.csproj`), which causes the `Xamarin.Android.Build.Tasks.dll` assembly to be loaded for use in the `<UsingTask/>` MSBuild statement, but at the same time `OpenTK.csproj` has a `@(ProjectReference)` to `Xamarin.Android.Build.Tasks.csproj`, which caused the `<ILRepacker/>` task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the `ILRepacker` target not run every time but only whenever the assembly has to be re-packed because it has just been rebuilt. This also improves rebuild times. [0]: https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task [m9613]: mono/mono#9613
jonpryor
pushed a commit
that referenced
this pull request
Aug 3, 2018
Xamarin.Android uses the [ILRepack task][0] to repack/merge the `Xamarin.Android.Build.Tasks.dll` assembly (610ade7), a step that is performed after the `Xamarin.Android.Build.Tasks.csproj` project's `Build` target completes. The step takes the project's output assembly -- `Xamarin.Android.Build.Tasks.dll` -- and several other dependencies, then merges them into one, *replacing* the original output assembly. The majority of time it works flawlessly, however when building the `monodroid` repo we observe a Mono runtime crash, similar-but-not- identical to [mono issue 9613][m9613]. Not all details are understood, but the high level overview of the issue is as follows: Mono runtime uses the **mmap**(2) system call on Unix to map the on-disk image of the assembly into memory. The `mmapp`ed area is used whenever the same assembly is loaded (e.g. `Assembly.LoadFrom()`) into the application to save time and memory. The memory is mapped as private which means that anything written to the mapped area by the Mono process is effectively discarded, that is not reflected in the file on disk. The protection, however, doesn't work in the other direction: when an external process (or even the same Mono process!) writes to the file that was `mmapp`ed. Unfortunately, the OS kernel behavior in such instance is left undefined by the POSIX standard: the kernel can choose to reflect the on-disk change in the mapping or ignore it. On macOS the write is ignored; on Linux, the write leads either to the `SIGBUS` signal being sent to the process or corruption to the `mmap`ped memory area (details of how this happens are, as of yet, unknown; it's just a theory at this point). The problem occurs in our case when the `<ILRepacker/>` task overwrites the `Xamarin.Android.Build.Tasks.dll` assembly with its merged/repackaged form and that, somehow, corrupts Mono runtime's memory mapping of that assembly, eventually crashing: ## native crash #0 0x00007f974fd1b23a in __waitpid (pid=pid@entry=120561, stat_loc=stat_loc@entry=0x7f9712162b9c, options=options@entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30 #1 0x000055b471f36c96 in dump_native_stacktrace (ctx=0x7f97121637c0, signal=0x55b472147cd3 "SIGSEGV") at mini-posix.c:719 #2 0x000055b471f36df2 in mono_dump_native_crash_info (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-posix.c:742 #3 0x000055b471ecc620 in mono_handle_native_crash (signal=signal@entry=0x55b472147cd3 "SIGSEGV", ctx=ctx@entry=0x7f97121637c0, info=info@entry=0x7f97121638f0) at mini-exceptions.c:2938 #4 0x000055b471e4c82c in mono_sigsegv_signal_handler (_dummy=7, _info=0x7f97121638f0, context=0x7f97121637c0) at mini-runtime.c:3441 #5 <signal handler called> #6 __strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:199 #7 0x000055b471fb2105 in mono_assembly_names_equal_flags (l=l@entry=0x7f96e0004370, r=r@entry=0x7f97307edb60, flags=flags@entry=MONO_ANAME_EQ_IGNORE_CASE) at assembly.c:663 #8 0x000055b471fa7baf in mono_domain_assembly_search (aname=0x7f96e0004370, user_data=0x0) at appdomain.c:2242 #9 0x000055b471fb10f7 in mono_assembly_invoke_search_hook_internal (aname=aname@entry=0x7f96e0004370, requesting=requesting@entry=0x0, refonly=0, postload=postload@entry=0) at assembly.c:1755 #10 0x000055b471fb4526 in mono_assembly_load_from_predicate (image=image@entry=0x7f96e001aae0, fname=fname@entry=0x7f96e000bc50 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=asmctx@entry=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2638 #11 0x000055b471fb635c in mono_assembly_open_predicate (filename=<optimized out>, filename@entry=0x7f96e000ae40 "/home/grendel/vc/xamarin/monodroid/monodroid/external/xamarin-android/src/Xamarin.Android.Build.Tasks/../../packages/ILRepack.Lib.MSBuild.Task.2.0.15.4/build/ILRepack.Lib.MSBuild.Task.dll", asmctx=MONO_ASMCTX_LOADFROM, predicate=predicate@entry=0x0, user_data=user_data@entry=0x0, status=status@entry=0x7f9712163fd4) at assembly.c:2206 #12 0x000055b471fabd42 in ves_icall_System_Reflection_Assembly_LoadFrom (fname=..., refOnly=<optimized out>, error=0x7f9712164050) at appdomain.c:2272 ... ## managed stacktrace at <unknown> <0xffffffff> at (wrapper managed-to-native) System.Reflection.Assembly.LoadFrom (string,bool) [0x0001b] in <79002cfb0e6e431d8465d6dcea08995e>:0 at System.Reflection.Assembly.LoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:539 at System.Reflection.Assembly.UnsafeLoadFrom (string) [0x00000] in /home/grendel/vc/mono/mono/mcs/class/corlib/System.Reflection/Assembly.cs:571 at Microsoft.Build.Shared.TypeLoader.LoadAssembly (Microsoft.Build.Shared.AssemblyLoadInfo) [0x0001e] in <bdc5207a22bb42ae9fe3f3d07e82871e>:0 ... The crash occurs in frame 7, because the `r` parameter (an instance of the `MonoAssembly` structure) contains pointers that used to point to valid places in the `Xamarin.Android.Build.Tasks.dll`s `mmap`ed area, but now point to garbage data. One of those corrupted pointers is the ASCII assembly name - which is used by the function in frame 7. The crash this commit fixes occurs in a very specific scenario: when building the `OpenTK.csproj` project *directly* (e.g. `msbuild OpenTK.csproj`), which causes the `Xamarin.Android.Build.Tasks.dll` assembly to be loaded for use in the `<UsingTask/>` MSBuild statement, but at the same time `OpenTK.csproj` has a `@(ProjectReference)` to `Xamarin.Android.Build.Tasks.csproj`, which caused the `<ILRepacker/>` task to run unconditionally, attempting to repack the assemblies again and leading to the crash described above. The fix, courtesy of @jonpryor, is to make the `ILRepacker` target not run every time but only whenever the assembly has to be re-packed because it has just been rebuilt. This also improves rebuild times. [0]: https://www.nuget.org/packages/ILRepack.Lib.MSBuild.Task [m9613]: mono/mono#9613
lewurm
added a commit
to lewurm/xamarin-android
that referenced
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Nov 21, 2018
grendello
added a commit
to grendello/xamarin-android
that referenced
this pull request
Jun 25, 2020
Context: https://developer.android.com/preview/behavior-changes-11#netlink-mac Context: https://developer.android.com/reference/java/net/NetworkInterface#getNetworkInterfaces() If an application targets `Android 11`/`API 30` (and newer) then the number of reported interfaces as well as the amount of information about them change to include less detail. First of all, only interfaces with associated IP addresses will be reported by both the `NetworkInterface` Java API and the `getifaddrs(3)` native libc API: * Application targetting API 28 on API 30 device: * name: wlan0; type: Ethernet * name: dummy0; type: Ethernet * name: lo; type: Loopback * name: hwsim0; type: Unknown * name: ip6tnl0; type: Tunnel * name: sit0; type: Tunnel * name: ip6_vti0; type: Tunnel * name: ip_vti0; type: Tunnel * Application targetting API 30 on API 30 device: * name: wlan0; type: 0 * name: dummy0; type: 0 * name: lo; type: 0 Second of all, as can be seen above, device information does not include the type of interface. This bit of information is what the `DotNetInterfacesShouldEqualJavaInterfaces` test relied on so far. That change broke our `DotNetInterfacesShouldEqualJavaInterfaces` test: DotNetInterfacesShouldEqualJavaInterfaces Mono interfaces: [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=lo, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] Java interfaces: [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=lo, IsLoopback=True, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] Interface radio0: passed Interface wlan0: passed Interface dummy0: passed [FAIL] : dotnet#8.3 (lo not found in Java interfaces) Expected: True But was: False at System.NetTests.NetworkInterfacesTest.DotNetInterfacesShouldEqualJavaInterfaces () [0x00152] in <c0e2a2f723184a6080f550609db0528d>:0 at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) Note that both Java and Mono return the same number of interfaces, with the same names but the `lo` interface in Mono list is not marked as loopback (`IsLoopback=False`) while the corresponding Java entry reports the interface is a loopback. In order to account for the above Android changes, we now look not only at the hardware type but also at its name in order to determine whether the device is a loopback one or not.
grendello
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that referenced
this pull request
Jun 25, 2020
Context: https://developer.android.com/preview/behavior-changes-11#netlink-mac Context: https://developer.android.com/reference/java/net/NetworkInterface#getNetworkInterfaces() If an application targets `Android 11`/`API 30` (and newer) then the number of reported interfaces as well as the amount of information about them change to include less detail. First of all, only interfaces with associated IP addresses will be reported by both the `NetworkInterface` Java API and the `getifaddrs(3)` native libc API: * Application targetting API 28 on API 30 device: * name: wlan0; type: Ethernet * name: dummy0; type: Ethernet * name: lo; type: Loopback * name: hwsim0; type: Unknown * name: ip6tnl0; type: Tunnel * name: sit0; type: Tunnel * name: ip6_vti0; type: Tunnel * name: ip_vti0; type: Tunnel * Application targetting API 30 on API 30 device: * name: wlan0; type: 0 * name: dummy0; type: 0 * name: lo; type: 0 Second of all, as can be seen above, device information does not include the type of interface. This bit of information is what the `DotNetInterfacesShouldEqualJavaInterfaces` test relied on so far. That change broke our `DotNetInterfacesShouldEqualJavaInterfaces` test: DotNetInterfacesShouldEqualJavaInterfaces Mono interfaces: [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=lo, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] Java interfaces: [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=lo, IsLoopback=True, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] Interface radio0: passed Interface wlan0: passed Interface dummy0: passed [FAIL] : dotnet#8.3 (lo not found in Java interfaces) Expected: True But was: False at System.NetTests.NetworkInterfacesTest.DotNetInterfacesShouldEqualJavaInterfaces () [0x00152] in <c0e2a2f723184a6080f550609db0528d>:0 at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) Note that both Java and Mono return the same number of interfaces, with the same names but the `lo` interface in Mono list is not marked as loopback (`IsLoopback=False`) while the corresponding Java entry reports the interface is a loopback. In order to account for the above Android changes, we now look not only at the hardware type but also at its name in order to determine whether the device is a loopback one or not.
jonpryor
pushed a commit
that referenced
this pull request
Jun 25, 2020
Context: https://developer.android.com/preview/behavior-changes-11#netlink-mac Context: https://developer.android.com/reference/java/net/NetworkInterface#getNetworkInterfaces() If an application targets Android 11/API-30 (and later), then the number of reported network interfaces as well as the amount of information about those interfaces includes less detail. First of all, only interfaces with associated IP addresses will be reported by both the `NetworkInterface` Java API and the [**getifaddrs**(3)][0] native libc API: * Application targetting API-28 on API-30 device: * name: wlan0; type: Ethernet * name: dummy0; type: Ethernet * name: lo; type: Loopback * name: hwsim0; type: Unknown * name: ip6tnl0; type: Tunnel * name: sit0; type: Tunnel * name: ip6_vti0; type: Tunnel * name: ip_vti0; type: Tunnel * Application targetting API-30 on API-30 device: * name: wlan0; type: 0 * name: dummy0; type: 0 * name: lo; type: 0 Second of all, as can be seen above, device information does not include the type of interface. This bit of information is what the `DotNetInterfacesShouldEqualJavaInterfaces()` test relied on so far. That change breaks `DotNetInterfacesShouldEqualJavaInterfaces()`: DotNetInterfacesShouldEqualJavaInterfaces Mono interfaces: [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=lo, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] Java interfaces: [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=lo, IsLoopback=True, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] Interface radio0: passed Interface wlan0: passed Interface dummy0: passed [FAIL] : #8.3 (lo not found in Java interfaces) Expected: True But was: False at System.NetTests.NetworkInterfacesTest.DotNetInterfacesShouldEqualJavaInterfaces () at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) Note that both Java and Mono return the same number of interfaces, with the same names, but the `lo` interface in Mono list is not marked as a loopback (`IsLoopback=False`), while the corresponding Java entry reports the interface is a loopback. In order to account for the above Android changes, we now look not only at the hardware type but also at its name in order to determine whether the device is a loopback one or not. [0]: https://www.man7.org/linux/man-pages/man3/getifaddrs.3.html
jonpryor
pushed a commit
that referenced
this pull request
Jun 26, 2020
Context: https://developer.android.com/preview/behavior-changes-11#netlink-mac Context: https://developer.android.com/reference/java/net/NetworkInterface#getNetworkInterfaces() If an application targets Android 11/API-30 (and later), then the number of reported network interfaces as well as the amount of information about those interfaces includes less detail. First of all, only interfaces with associated IP addresses will be reported by both the `NetworkInterface` Java API and the [**getifaddrs**(3)][0] native libc API: * Application targetting API-28 on API-30 device: * name: wlan0; type: Ethernet * name: dummy0; type: Ethernet * name: lo; type: Loopback * name: hwsim0; type: Unknown * name: ip6tnl0; type: Tunnel * name: sit0; type: Tunnel * name: ip6_vti0; type: Tunnel * name: ip_vti0; type: Tunnel * Application targetting API-30 on API-30 device: * name: wlan0; type: 0 * name: dummy0; type: 0 * name: lo; type: 0 Second of all, as can be seen above, device information does not include the type of interface. This bit of information is what the `DotNetInterfacesShouldEqualJavaInterfaces()` test relied on so far. That change breaks `DotNetInterfacesShouldEqualJavaInterfaces()`: DotNetInterfacesShouldEqualJavaInterfaces Mono interfaces: [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=lo, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] Java interfaces: [InterfaceInfo: Name=dummy0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::4c41:86ff:fe93:6354%2>] [InterfaceInfo: Name=wlan0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::e00a:8bb6:415b:4c97%9, fec0::f925:950b:4c31:eea7, fec0::315a:4cc4:796:6915, 10.0.2.16>] [InterfaceInfo: Name=lo, IsLoopback=True, IsUp=True, HardwareAddress=<>, Addresses=<::1, 127.0.0.1>] [InterfaceInfo: Name=radio0, IsLoopback=False, IsUp=True, HardwareAddress=<>, Addresses=<fe80::d4d9:5aff:fe48:60be%11, fec0::d4d9:5aff:fe48:60be, fec0::397c:d582:6278:ca2c, 10.0.2.15>] Interface radio0: passed Interface wlan0: passed Interface dummy0: passed [FAIL] : #8.3 (lo not found in Java interfaces) Expected: True But was: False at System.NetTests.NetworkInterfacesTest.DotNetInterfacesShouldEqualJavaInterfaces () at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&) Note that both Java and Mono return the same number of interfaces, with the same names, but the `lo` interface in Mono list is not marked as a loopback (`IsLoopback=False`), while the corresponding Java entry reports the interface is a loopback. In order to account for the above Android changes, we now look not only at the hardware type but also at its name in order to determine whether the device is a loopback one or not. [0]: https://www.man7.org/linux/man-pages/man3/getifaddrs.3.html
grendello
added a commit
to grendello/xamarin-android
that referenced
this pull request
Nov 22, 2022
It won't fix the failure, but extra logging might be useful at some
point. The current failure is:
droid.NET_Test: java_vm_ext.cc:570] JNI DETECTED ERROR IN APPLICATION: use of invalid jobject 0x7100941bb830
backtrace:
#00 pc 00000000000943f8 /apex/com.android.runtime/lib64/bionic/libc.so (syscall+24) (BuildId: a08a19770d6696739c847e29c3f5f650)
#1 pc 0000000000097146 /apex/com.android.runtime/lib64/bionic/libc.so (abort+182) (BuildId: a08a19770d6696739c847e29c3f5f650)
#2 pc 000000000055321f /apex/com.android.runtime/lib64/libart.so (art::Runtime::Abort(char const*)+2399) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
#3 pc 000000000000c873 /system/lib64/libbase.so (android::base::LogMessage::~LogMessage()+611) (BuildId: 40d2b536dbf0730fdc31abd2b469f94f)
dotnet#4 pc 00000000003ede64 /apex/com.android.runtime/lib64/libart.so (art::JavaVMExt::JniAbort(char const*, char const*)+1604) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#5 pc 00000000003ee16a /apex/com.android.runtime/lib64/libart.so (art::JavaVMExt::JniAbortF(char const*, char const*, ...)+234) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#6 pc 00000000005adf7b /apex/com.android.runtime/lib64/libart.so (art::Thread::DecodeJObject(_jobject*) const+875) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#7 pc 00000000003def7b /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckInstance(art::ScopedObjectAccess&, art::(anonymous namespace)::ScopedCheck::InstanceKind, _jobject*, bool)+91) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#8 pc 00000000003de1e5 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckPossibleHeapValue(art::ScopedObjectAccess&, char, art::(anonymous namespace)::JniValueType)+485) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#9 pc 00000000003de2d4 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckPossibleHeapValue(art::ScopedObjectAccess&, char, art::(anonymous namespace)::JniValueType)+724) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#10 pc 00000000003dd712 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::Check(art::ScopedObjectAccess&, bool, char const*, art::(anonymous namespace)::JniValueType*)+690) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#11 pc 00000000003e28c0 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::CheckJNI::CheckCallArgs(art::ScopedObjectAccess&, art::(anonymous namespace)::ScopedCheck&, _JNIEnv*, _jobject*, _jclass*, _jmethodID*, art::InvokeType, art::(anonymous namespace)::VarArgs const*)+160) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#12 pc 00000000003e1a9e /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::CheckJNI::CallMethodV(char const*, _JNIEnv*, _jobject*, _jclass*, _jmethodID*, __va_list_tag*, art::Primitive::Type, art::InvokeType)+910) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#13 pc 00000000003cf551 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::CheckJNI::CallObjectMethod(_JNIEnv*, _jobject*, _jmethodID*, ...)+177) (BuildId: 8bb3225e7c408f2ca23abac3db0417f2)
dotnet#14 pc 00000000000013ec /data/app/Mono.Android.NET_Tests--O9vgexkYeCx3nX-AuvLTQ==/split_config.x86_64.apk!libreuse-threads.so (offset 0xa8d000) (BuildId: 562d86d81ebdd3bb6b7528e2a9235ff84827294e)
dotnet#15 pc 0000000000100fce /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+30) (BuildId: a08a19770d6696739c847e29c3f5f650)
dotnet#16 pc 0000000000098fe7 /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+55) (BuildId: a08a19770d6696739c847e29c3f5f650)
jonpryor
added a commit
that referenced
this pull request
Jan 26, 2024
Context: dotnet/java-interop@6b3637d The story so far is that some of our unit tests are crashing, and have been in one form or another since 4332ea0 (the bump to dotnet/java-interop@def5bc0). The current crash, from the PR build for 7b46391: D monodroid-assembly: typemap: assembly 'Java.Interop-Tests' hasn't been loaded yet, attempting a full load W monodroid-assembly: typemap: failed to load managed assembly 'Java.Interop-Tests.dll'. No such file or directory E monodroid-assembly: typemap: unable to load assembly 'Java.Interop-Tests' when looking up managed type corresponding to Java type 'java/lang/Object' I monodroid-timing: [1/5] Typemap.java_to_managed: end, total time; elapsed: 0:0::260000 W monodroid-assembly: typemap: called from W monodroid-assembly: at Java.Interop.TypeManager.GetJavaToManagedType(String ) W monodroid-assembly: at Java.Interop.TypeManager.CreateInstance(IntPtr , JniHandleOwnership , Type ) W monodroid-assembly: at Java.Lang.Object.GetObject(IntPtr , JniHandleOwnership , Type ) W monodroid-assembly: at Java.Lang.Object._GetObject[IIterator](IntPtr , JniHandleOwnership ) W monodroid-assembly: at Java.Lang.Object.GetObject[IIterator](IntPtr handle, JniHandleOwnership transfer) W monodroid-assembly: at Android.Runtime.JavaSet.Iterator() W monodroid-assembly: at Android.Runtime.JavaSet`1[[System.String, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].GetEnumerator() W monodroid-assembly: at Xamarin.Android.UnitTests.TestInstrumentation`1[[Xamarin.Android.UnitTests.NUnit.NUnitTestRunner, TestRunner.NUnit.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].ProcessArguments() W monodroid-assembly: at Xamarin.Android.UnitTests.TestInstrumentation`1[[Xamarin.Android.UnitTests.NUnit.NUnitTestRunner, TestRunner.NUnit.NET, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].OnCreate(Bundle arguments) W monodroid-assembly: at Android.App.Instrumentation.n_OnCreate_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_arguments) W monodroid-assembly: at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V(_JniMarshal_PPL_V callback, IntPtr jnienv, IntPtr klazz, IntPtr p0) E droid.NET_Test: JNI ERROR (app bug): accessed stale Local 0x75 (index 7 in a table of size 7) F droid.NET_Test: java_vm_ext.cc:570] JNI DETECTED ERROR IN APPLICATION: use of deleted local reference 0x75 There are *three* "concerning" items here: 1. typemaps are trying to load `Java.Interop-Tests`, and failing: typemap: failed to load managed assembly 'Java.Interop-Tests.dll'. No such file or directory @grendello is looking into this. 2. The binding for `java/lang/Object` is coming from Java.Interop-Tests, not Mono.Android (?!) typemap: unable to load assembly 'Java.Interop-Tests' when looking up managed type corresponding to Java type 'java/lang/Object' dotnet/java-interop#1181 has a fix for this, and we're not applying the fix yet because we believe that it will hide (1). 3. The JNI error, which crashes the process: F droid.NET_Test: java_vm_ext.cc:570] JNI DETECTED ERROR IN APPLICATION: use of deleted local reference 0x75 F droid.NET_Test: java_vm_ext.cc:570] from void crc643df67da7b13bb6b1.TestInstrumentation_1.n_onCreate(android.os.Bundle) F droid.NET_Test: runtime.cc:630] Runtime aborting... F droid.NET_Test: runtime.cc:630] Dumping all threads without mutator lock held F droid.NET_Test: runtime.cc:630] All threads: F droid.NET_Test: runtime.cc:630] DALVIK THREADS (14): F droid.NET_Test: runtime.cc:630] "main" prio=5 tid=1 Runnable F droid.NET_Test: runtime.cc:630] | group="" sCount=0 dsCount=0 flags=0 obj=0x729e9d98 self=0x7567e0f51000 F droid.NET_Test: runtime.cc:630] | sysTid=9143 nice=0 cgrp=default sched=0/0 handle=0x7567e14daed8 F droid.NET_Test: runtime.cc:630] | state=R schedstat=( 1270418000 334229000 139 ) utm=16 stm=110 core=0 HZ=100 F droid.NET_Test: runtime.cc:630] | stack=0x7ffcbb3e4000-0x7ffcbb3e6000 stackSize=8192KB F droid.NET_Test: runtime.cc:630] | held mutexes= "abort lock" "mutator lock"(shared held) F droid.NET_Test: runtime.cc:630] native: #00 pc 000000000048df4e /apex/com.android.runtime/lib64/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, int, BacktraceMap*, char const*, art::ArtMethod*, void*, bool)+126) F droid.NET_Test: runtime.cc:630] native: #1 pc 00000000005a77c3 /apex/com.android.runtime/lib64/libart.so (art::Thread::DumpStack(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, bool, BacktraceMap*, bool) const+675) F droid.NET_Test: runtime.cc:630] native: #2 pc 00000000005c49cb /apex/com.android.runtime/lib64/libart.so (art::DumpCheckpoint::Run(art::Thread*)+859) F droid.NET_Test: runtime.cc:630] native: #3 pc 00000000005bcf28 /apex/com.android.runtime/lib64/libart.so (art::ThreadList::RunCheckpoint(art::Closure*, art::Closure*)+456) F droid.NET_Test: runtime.cc:630] native: #4 pc 00000000005bc2e1 /apex/com.android.runtime/lib64/libart.so (art::ThreadList::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char>>&, bool)+1601) F droid.NET_Test: runtime.cc:630] native: #5 pc 0000000000552eb9 /apex/com.android.runtime/lib64/libart.so (art::Runtime::Abort(char const*)+1529) F droid.NET_Test: runtime.cc:630] native: #6 pc 000000000000c873 /system/lib64/libbase.so (android::base::LogMessage::~LogMessage()+611) F droid.NET_Test: runtime.cc:630] native: #7 pc 00000000003ede84 /apex/com.android.runtime/lib64/libart.so (art::JavaVMExt::JniAbort(char const*, char const*)+1604) F droid.NET_Test: runtime.cc:630] native: #8 pc 00000000003ee18a /apex/com.android.runtime/lib64/libart.so (art::JavaVMExt::JniAbortF(char const*, char const*, ...)+234) F droid.NET_Test: runtime.cc:630] native: #9 pc 00000000005adf31 /apex/com.android.runtime/lib64/libart.so (art::Thread::DecodeJObject(_jobject*) const+785) F droid.NET_Test: runtime.cc:630] native: #10 pc 00000000003def9b /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckInstance(art::ScopedObjectAccess&, art::(anonymous namespace)::ScopedCheck::InstanceKind, _jobject*, bool)+91) F droid.NET_Test: runtime.cc:630] native: #11 pc 00000000003de205 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckPossibleHeapValue(art::ScopedObjectAccess&, char, art::(anonymous namespace)::JniValueType)+485) F droid.NET_Test: runtime.cc:630] native: #12 pc 00000000003dd732 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::Check(art::ScopedObjectAccess&, bool, char const*, art::(anonymous namespace)::JniValueType*)+690) F droid.NET_Test: runtime.cc:630] native: #13 pc 00000000003ce865 /apex/com.android.runtime/lib64/libart.so (art::(anonymous namespace)::CheckJNI::GetObjectClass(_JNIEnv*, _jobject*)+837) F droid.NET_Test: runtime.cc:630] native: #14 pc 0000000000017196 /data/app/Mono.Android.NET_Tests-LUUW792fOvX745oAS4jeRQ==/split_config.x86_64.apk (offset 331000) (???) F droid.NET_Test: runtime.cc:630] at crc643df67da7b13bb6b1.TestInstrumentation_1.n_onCreate(Native method) As per `native #13`, we're (somehow) passing an invalid JNI reference to `JNIEnv::GetObjectClass()`. ***HOW*** are we passing an invalid JNI reference to `JNIEnv::GetObjectClass()`? Attempt to investigate (3) further, by: 1. Reviewing all calls to `JNIEnv::GetObjectClass()` within this repo to see if we could potentially be passing an invalid value. The "most obvious" candidate is `TypeManager.CreateInstance()`, which calls `JNIEnv::GetObjectClass()` in a loop. I'm still not sure if that could possibly be the cause, but Just In Case™… "Cleanup" some C++ code so that calls to `JNIEnv::DeleteLocalReference()` are closer to the `JNIEnv::GetObjectClass()` calls. 2. Update `tests/Mono.Android-Tests/Runtime-Microsoft.Android.Sdk/Mono.Android.NET-Tests.csproj` to add an `@(AndroidEnvironment)` item, which sets `debug.mono.log=gref+,lref+`. This will enable LREF and GREF logging within `adb logcat`, which *may* allow us to track down where "local reference 0x75" came from.
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.. incremental builds.