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Race in RuntimeTypeCache / metadata reading #81884

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marek-safar opened this issue Feb 9, 2023 · 8 comments · Fixed by #81947
Closed

Race in RuntimeTypeCache / metadata reading #81884

marek-safar opened this issue Feb 9, 2023 · 8 comments · Fixed by #81947
Labels
area-System.Reflection
Milestone
8.0.0

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@marek-safar
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It happened to me twice but could not reproduce it reliably.

__DistroRid: osx-arm64
  Determining projects to restore...
  Unhandled exception: System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
   ---> System.NullReferenceException: Object reference not set to an instance of an object.
     at System.RuntimeType.get_IsGenericTypeDefinition()
     at System.RuntimeType.MakeGenericType(Type[] instantiation)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.PopulateInterfaces(Filter filter)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.GetListByName(Char* pName, Int32 cNameLen, Byte* pUtf8Name, Int32 cUtf8Name, MemberListType listType, CacheType cacheType)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.Populate(String name, MemberListType listType, CacheType cacheType)
     at System.RuntimeType.GetInterfaces()
     at System.Text.Json.Reflection.ReflectionExtensions.GetCompatibleGenericInterface(Type type, Type interfaceType)
     at System.Text.Json.Serialization.IAsyncEnumerableConverterFactory.CanConvert(Type typeToConvert)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetBuiltInConverter(Type typeToConvert)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetConverterForType(Type typeToConvert, JsonSerializerOptions options, Boolean resolveJsonConverterAttribute)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.CreateJsonTypeInfo(Type type, JsonSerializerOptions options)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetTypeInfo(Type type, JsonSerializerOptions options)
     at System.Text.Json.JsonSerializerOptions.GetTypeInfoNoCaching(Type type)
     at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
     at System.Text.Json.JsonSerializerOptions.GetTypeInfoInternal(Type type, Boolean ensureConfigured, Boolean resolveIfMutable)
     at System.Text.Json.JsonSerializer.GetTypeInfo(JsonSerializerOptions options, Type inputType)
     at System.Text.Json.JsonSerializer.GetTypeInfo[T](JsonSerializerOptions options)
     at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
     at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.GetCacheTable(String packageCacheFile)
     at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.TryLoad(RestoredCommandIdentifier restoredCommandIdentifier, RestoredCommand& restoredCommand)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.PackageHasBeenRestored(ToolManifestPackage package, String targetFramework)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable`1 configFile)
     at System.Linq.Parallel.SelectQueryOperator`2.SelectQueryOperatorResults.GetElement(Int32 index)
     at System.Linq.Parallel.QueryResults`1.get_Item(Int32 index)
     at System.Linq.Parallel.PartitionedDataSource`1.ListContiguousIndexRangeEnumerator.MoveNext(T& currentElement, Int32& currentKey)
     at System.Linq.Parallel.StopAndGoSpoolingTask`2.SpoolingWork()
     at System.Linq.Parallel.SpoolingTaskBase.Work()
     at System.Linq.Parallel.QueryTask.BaseWork(Object unused)
     at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
  --- End of stack trace from previous location ---
     at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
     --- End of inner exception stack trace ---
     at System.Linq.Parallel.QueryTaskGroupState.QueryEnd(Boolean userInitiatedDispose)
     at System.Linq.Parallel.SpoolingTask.SpoolStopAndGo[TInputOutput,TIgnoreKey](QueryTaskGroupState groupState, PartitionedStream`2 partitions, SynchronousChannel`1[] channels, TaskScheduler taskScheduler)
     at System.Linq.Parallel.DefaultMergeHelper`2.System.Linq.Parallel.IMergeHelper<TInputOutput>.Execute()
     at System.Linq.Parallel.MergeExecutor`1.Execute()
     at System.Linq.Parallel.MergeExecutor`1.Execute[TKey](PartitionedStream`2 partitions, Boolean ignoreOutput, ParallelMergeOptions options, TaskScheduler taskScheduler, Boolean isOrdered, CancellationState cancellationState, Int32 queryId)
     at System.Linq.Parallel.PartitionedStreamMerger`1.Receive[TKey](PartitionedStream`2 partitionedStream)
     at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient)
     at System.Linq.Parallel.QueryOperator`1.ExecuteAndGetResultsAsArray()
     at System.Linq.ParallelEnumerable.ToArray[TSource](ParallelQuery`1 source)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.Execute()
     at System.CommandLine.Invocation.InvocationPipeline.<>c__DisplayClass4_0.<<BuildInvocationChain>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at Microsoft.DotNet.Cli.Parser.<>c__DisplayClass17_0.<<UseParseErrorReporting>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass11_0.<<UseHelp>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c.<<UseSuggestDirective>b__17_0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass15_0.<<UseParseDirective>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass7_0.<<UseExceptionHandler>b__0>d.MoveNext()

Version: 8.0.100-alpha.1.23068.1
@ghost ghost added the untriaged New issue has not been triaged by the area owner label Feb 9, 2023
@ghost
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ghost commented Feb 9, 2023

Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis
See info in area-owners.md if you want to be subscribed.

Issue Details

It happened to me twice but could not reproduce it reliably.

__DistroRid: osx-arm64
  Determining projects to restore...
  Unhandled exception: System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
   ---> System.NullReferenceException: Object reference not set to an instance of an object.
     at System.RuntimeType.get_IsGenericTypeDefinition()
     at System.RuntimeType.MakeGenericType(Type[] instantiation)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.PopulateInterfaces(Filter filter)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.GetListByName(Char* pName, Int32 cNameLen, Byte* pUtf8Name, Int32 cUtf8Name, MemberListType listType, CacheType cacheType)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.Populate(String name, MemberListType listType, CacheType cacheType)
     at System.RuntimeType.GetInterfaces()
     at System.Text.Json.Reflection.ReflectionExtensions.GetCompatibleGenericInterface(Type type, Type interfaceType)
     at System.Text.Json.Serialization.IAsyncEnumerableConverterFactory.CanConvert(Type typeToConvert)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetBuiltInConverter(Type typeToConvert)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetConverterForType(Type typeToConvert, JsonSerializerOptions options, Boolean resolveJsonConverterAttribute)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.CreateJsonTypeInfo(Type type, JsonSerializerOptions options)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetTypeInfo(Type type, JsonSerializerOptions options)
     at System.Text.Json.JsonSerializerOptions.GetTypeInfoNoCaching(Type type)
     at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
     at System.Text.Json.JsonSerializerOptions.GetTypeInfoInternal(Type type, Boolean ensureConfigured, Boolean resolveIfMutable)
     at System.Text.Json.JsonSerializer.GetTypeInfo(JsonSerializerOptions options, Type inputType)
     at System.Text.Json.JsonSerializer.GetTypeInfo[T](JsonSerializerOptions options)
     at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
     at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.GetCacheTable(String packageCacheFile)
     at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.TryLoad(RestoredCommandIdentifier restoredCommandIdentifier, RestoredCommand& restoredCommand)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.PackageHasBeenRestored(ToolManifestPackage package, String targetFramework)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable`1 configFile)
     at System.Linq.Parallel.SelectQueryOperator`2.SelectQueryOperatorResults.GetElement(Int32 index)
     at System.Linq.Parallel.QueryResults`1.get_Item(Int32 index)
     at System.Linq.Parallel.PartitionedDataSource`1.ListContiguousIndexRangeEnumerator.MoveNext(T& currentElement, Int32& currentKey)
     at System.Linq.Parallel.StopAndGoSpoolingTask`2.SpoolingWork()
     at System.Linq.Parallel.SpoolingTaskBase.Work()
     at System.Linq.Parallel.QueryTask.BaseWork(Object unused)
     at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
  --- End of stack trace from previous location ---
     at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
     --- End of inner exception stack trace ---
     at System.Linq.Parallel.QueryTaskGroupState.QueryEnd(Boolean userInitiatedDispose)
     at System.Linq.Parallel.SpoolingTask.SpoolStopAndGo[TInputOutput,TIgnoreKey](QueryTaskGroupState groupState, PartitionedStream`2 partitions, SynchronousChannel`1[] channels, TaskScheduler taskScheduler)
     at System.Linq.Parallel.DefaultMergeHelper`2.System.Linq.Parallel.IMergeHelper<TInputOutput>.Execute()
     at System.Linq.Parallel.MergeExecutor`1.Execute()
     at System.Linq.Parallel.MergeExecutor`1.Execute[TKey](PartitionedStream`2 partitions, Boolean ignoreOutput, ParallelMergeOptions options, TaskScheduler taskScheduler, Boolean isOrdered, CancellationState cancellationState, Int32 queryId)
     at System.Linq.Parallel.PartitionedStreamMerger`1.Receive[TKey](PartitionedStream`2 partitionedStream)
     at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient)
     at System.Linq.Parallel.QueryOperator`1.ExecuteAndGetResultsAsArray()
     at System.Linq.ParallelEnumerable.ToArray[TSource](ParallelQuery`1 source)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.Execute()
     at System.CommandLine.Invocation.InvocationPipeline.<>c__DisplayClass4_0.<<BuildInvocationChain>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at Microsoft.DotNet.Cli.Parser.<>c__DisplayClass17_0.<<UseParseErrorReporting>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass11_0.<<UseHelp>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c.<<UseSuggestDirective>b__17_0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass15_0.<<UseParseDirective>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass7_0.<<UseExceptionHandler>b__0>d.MoveNext()

Version: 8.0.100-alpha.1.23068.1

Author: marek-safar
Assignees: -
Labels:

area-System.Text.Json
Milestone: -

@marek-safar marek-safar added area-System.Reflection and removed untriaged New issue has not been triaged by the area owner area-System.Text.Json labels Feb 9, 2023
@ghost
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ghost commented Feb 9, 2023

Tagging subscribers to this area: @dotnet/area-system-reflection
See info in area-owners.md if you want to be subscribed.

Issue Details

It happened to me twice but could not reproduce it reliably.

__DistroRid: osx-arm64
  Determining projects to restore...
  Unhandled exception: System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
   ---> System.NullReferenceException: Object reference not set to an instance of an object.
     at System.RuntimeType.get_IsGenericTypeDefinition()
     at System.RuntimeType.MakeGenericType(Type[] instantiation)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.PopulateInterfaces(Filter filter)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.GetListByName(Char* pName, Int32 cNameLen, Byte* pUtf8Name, Int32 cUtf8Name, MemberListType listType, CacheType cacheType)
     at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.Populate(String name, MemberListType listType, CacheType cacheType)
     at System.RuntimeType.GetInterfaces()
     at System.Text.Json.Reflection.ReflectionExtensions.GetCompatibleGenericInterface(Type type, Type interfaceType)
     at System.Text.Json.Serialization.IAsyncEnumerableConverterFactory.CanConvert(Type typeToConvert)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetBuiltInConverter(Type typeToConvert)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetConverterForType(Type typeToConvert, JsonSerializerOptions options, Boolean resolveJsonConverterAttribute)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.CreateJsonTypeInfo(Type type, JsonSerializerOptions options)
     at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetTypeInfo(Type type, JsonSerializerOptions options)
     at System.Text.Json.JsonSerializerOptions.GetTypeInfoNoCaching(Type type)
     at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
     at System.Text.Json.JsonSerializerOptions.GetTypeInfoInternal(Type type, Boolean ensureConfigured, Boolean resolveIfMutable)
     at System.Text.Json.JsonSerializer.GetTypeInfo(JsonSerializerOptions options, Type inputType)
     at System.Text.Json.JsonSerializer.GetTypeInfo[T](JsonSerializerOptions options)
     at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
     at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.GetCacheTable(String packageCacheFile)
     at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.TryLoad(RestoredCommandIdentifier restoredCommandIdentifier, RestoredCommand& restoredCommand)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.PackageHasBeenRestored(ToolManifestPackage package, String targetFramework)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable`1 configFile)
     at System.Linq.Parallel.SelectQueryOperator`2.SelectQueryOperatorResults.GetElement(Int32 index)
     at System.Linq.Parallel.QueryResults`1.get_Item(Int32 index)
     at System.Linq.Parallel.PartitionedDataSource`1.ListContiguousIndexRangeEnumerator.MoveNext(T& currentElement, Int32& currentKey)
     at System.Linq.Parallel.StopAndGoSpoolingTask`2.SpoolingWork()
     at System.Linq.Parallel.SpoolingTaskBase.Work()
     at System.Linq.Parallel.QueryTask.BaseWork(Object unused)
     at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
  --- End of stack trace from previous location ---
     at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
     --- End of inner exception stack trace ---
     at System.Linq.Parallel.QueryTaskGroupState.QueryEnd(Boolean userInitiatedDispose)
     at System.Linq.Parallel.SpoolingTask.SpoolStopAndGo[TInputOutput,TIgnoreKey](QueryTaskGroupState groupState, PartitionedStream`2 partitions, SynchronousChannel`1[] channels, TaskScheduler taskScheduler)
     at System.Linq.Parallel.DefaultMergeHelper`2.System.Linq.Parallel.IMergeHelper<TInputOutput>.Execute()
     at System.Linq.Parallel.MergeExecutor`1.Execute()
     at System.Linq.Parallel.MergeExecutor`1.Execute[TKey](PartitionedStream`2 partitions, Boolean ignoreOutput, ParallelMergeOptions options, TaskScheduler taskScheduler, Boolean isOrdered, CancellationState cancellationState, Int32 queryId)
     at System.Linq.Parallel.PartitionedStreamMerger`1.Receive[TKey](PartitionedStream`2 partitionedStream)
     at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient)
     at System.Linq.Parallel.QueryOperator`1.ExecuteAndGetResultsAsArray()
     at System.Linq.ParallelEnumerable.ToArray[TSource](ParallelQuery`1 source)
     at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.Execute()
     at System.CommandLine.Invocation.InvocationPipeline.<>c__DisplayClass4_0.<<BuildInvocationChain>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at Microsoft.DotNet.Cli.Parser.<>c__DisplayClass17_0.<<UseParseErrorReporting>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass11_0.<<UseHelp>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c.<<UseSuggestDirective>b__17_0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass15_0.<<UseParseDirective>b__0>d.MoveNext()
  --- End of stack trace from previous location ---
     at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass7_0.<<UseExceptionHandler>b__0>d.MoveNext()

Version: 8.0.100-alpha.1.23068.1

Author: marek-safar
Assignees: -
Labels:

area-System.Reflection, area-System.Text.Json
Milestone: -

@marek-safar marek-safar added the untriaged New issue has not been triaged by the area owner label Feb 9, 2023
@jkotas
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jkotas commented Feb 9, 2023

@EgorBo This is likely caused by missing memory barrier when allocation RuntimeType objects on FOD. Could you please take a look?

@jkotas jkotas added this to the 8.0.0 milestone Feb 9, 2023
@ghost ghost removed the untriaged New issue has not been triaged by the area owner label Feb 9, 2023
@EgorBo
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EgorBo commented Feb 9, 2023

@EgorBo This is likely caused by missing memory barrier when allocation RuntimeType objects on FOD. Could you please take a look?

hm.. in general, RtunimeType objects are expected to be allocated and cached under a lock here https://github.com/dotnet/runtime/blob/main/src/coreclr/vm/typehandle.cpp#L366

@jkotas
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jkotas commented Feb 9, 2023

Here is what is likely happening:

Thread 1: Acquires the lock
Thread 1: Allocates, initializes and publishes the instance (without taking any memory barriers)

Thread 2: Observes the pointer to the published instance, but does not observe the initialized instance (the writes that are initializing the instance are still pending)
-> NullReferenceException caused by attempt to access null TypeHandle

Thread 1: Releases the lock that flushes pending memory writes

@jkotas
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jkotas commented Feb 9, 2023

BTW: We avoid this sort of problem for regular managed objects and managed references by issuing memory barrier as part of the GC write barrier.

@jkotas
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jkotas commented Feb 9, 2023

The fix should be to change this https://github.com/dotnet/runtime/blob/main/src/coreclr/vm/typehandle.cpp#L380 and other similar places to use VolatileStore.

@EgorBo
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EgorBo commented Feb 9, 2023

The fix should be to change this https://github.com/dotnet/runtime/blob/main/src/coreclr/vm/typehandle.cpp#L380 and other similar places to use VolatileStore.

Ok, I'll go check all the places I touched related to FOH for that, thanks for the analysis!

@EgorBo EgorBo mentioned this issue Feb 10, 2023
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@ghost ghost added the in-pr There is an active PR which will close this issue when it is merged label Feb 10, 2023
@ghost ghost removed the in-pr There is an active PR which will close this issue when it is merged label Feb 10, 2023
@ghost ghost locked as resolved and limited conversation to collaborators Mar 12, 2023
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Fix race condition in AllocateManagedClassObject EgorBo/runtime-1
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@marek-safar @EgorBo @jkotas