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Strange case of Segfault #1147

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brandy125 opened this issue Sep 24, 2021 · 4 comments
Closed

Strange case of Segfault #1147

brandy125 opened this issue Sep 24, 2021 · 4 comments

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@brandy125
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I am getting constantly segmentation fault with my programs (that use call_externals) and various GDL versions.
Who could help me to debug this?

With GDL version
GDL> !gdl
{ 1.0.0-rc.2 Sep 24 2021 1632452400 1 0 1}

I get following result when calling with valgrind:

==22407== Warning: client switching stacks? SP change: 0x1ffeffd5c0 --> 0x1ffe7fd528
==22407== to suppress, use: --max-stackframe=8388760 or greater
==22407== Invalid write of size 8
==22407== at 0xC9215C: lib::copy_basic(char const*, char const*) (in /usr/local/bin/gdl)
==22407== Address 0x1ffe7fd528 is on thread 1's stack
==22407==
==22407== Can't extend stack to 0x1ffe7fc5e8 during signal delivery for thread 1:
==22407== no stack segment
==22407==
==22407== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==22407== Access not within mapped region at address 0x1FFE7FC5E8
==22407== at 0xC9215C: lib::copy_basic(char const*, char const*) (in /usr/local/bin/gdl)
==22407== If you believe this happened as a result of a stack
==22407== overflow in your program's main thread (unlikely but
==22407== possible), you can try to increase the size of the
==22407== main thread stack using the --main-stacksize= flag.
==22407== The main thread stack size used in this run was 20480000.
==22407== Invalid write of size 8
==22407== at 0x4835110: _vgnU_freeres (in /usr/libexec/valgrind/vgpreload_core-amd64-linux.so)
==22407== Address 0x1ffe7fd4a0 is on thread 1's stack
==22407==
==22407==
==22407== Process terminating with default action of signal 11 (SIGSEGV)
==22407== Access not within mapped region at address 0x1FFE7FD4A0
==22407== at 0x4835110: _vgnU_freeres (in /usr/libexec/valgrind/vgpreload_core-amd64-linux.so)
==22407== If you believe this happened as a result of a stack
==22407== overflow in your program's main thread (unlikely but
==22407== possible), you can try to increase the size of the
==22407== main thread stack using the --main-stacksize= flag.
==22407== The main thread stack size used in this run was 20480000.
==22407==
==22407== HEAP SUMMARY:
==22407== in use at exit: 66,605,152 bytes in 152,630 blocks
==22407== total heap usage: 9,330,418 allocs, 9,177,788 frees, 3,032,494,405 bytes allocated
==22407==
==22407== LEAK SUMMARY:
==22407== definitely lost: 126,308 bytes in 236 blocks
==22407== indirectly lost: 53,482 bytes in 25 blocks
==22407== possibly lost: 3,072 bytes in 8 blocks
==22407== still reachable: 66,349,658 bytes in 151,844 blocks
==22407== of which reachable via heuristic:
==22407== newarray : 776 bytes in 1 blocks
==22407== multipleinheritance: 335,872 bytes in 2 blocks
==22407== suppressed: 0 bytes in 0 blocks
==22407== Rerun with --leak-check=full to see details of leaked memory
==22407==
==22407== Use --track-origins=yes to see where uninitialised values come from
==22407== For lists of detected and suppressed errors, rerun with: -s
==22407== ERROR SUMMARY: 7 errors from 3 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)

Running with gdb gdl I get:

(gdb) bt
#0 0x00007ffff57e7f68 in _int_malloc (av=av@entry=0x7ffff5920a00 <main_arena>, bytes=bytes@entry=31) at malloc.c:3894
#1 0x00007ffff57e92f1 in __GI___libc_malloc (bytes=31) at malloc.c:3237
#2 0x00007ffff5a4396c in operator new(unsigned long) () at /lib64/libstdc++.so.6
#3 0x00007ffff5ad77d2 in std::__cxx11::basic_string<char, std::char_traits, std::allocator >::_M_assign(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&) () at /lib64/libstdc++.so.6
#4 0x0000000000c70c0c in DNode::initialize(int, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&) ()
#5 0x0000000001056ad6 in antlr::ASTFactory::create(int, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&) ()
#6 0x00000000006f2cc9 in GDLParser::primary_expr() ()
#7 0x00000000006f3b89 in GDLParser::decinc_expr() ()
#8 0x00000000006f4808 in GDLParser::exponential_expr() ()
#9 0x00000000006f4e7d in GDLParser::multiplicative_expr() ()
#10 0x00000000006ced61 in GDLParser::signed_multiplicative_expr() ()
#11 0x00000000006cf6dc in GDLParser::additive_expr() ()
#12 0x00000000006d05ca in GDLParser::relational_expr() ()
#13 0x00000000006d163a in GDLParser::boolean_expr() ()
#14 0x00000000006d212a in GDLParser::logical_expr() ()
#15 0x00000000006d2a01 in GDLParser::expr() ()
#16 0x00000000006d4026 in GDLParser::parameter_def() ()
#17 0x00000000006d4acb in GDLParser::parameter_def_list() ()
#18 0x00000000006d5610 in GDLParser::formal_function_call() ()
#19 0x00000000006efb94 in GDLParser::primary_expr_tail() ()
#20 0x00000000006f0f98 in GDLParser::primary_expr_deref() ()
#21 0x00000000006f2a15 in GDLParser::primary_expr() ()
#22 0x00000000006f3b89 in GDLParser::decinc_expr() ()
#23 0x00000000006f4808 in GDLParser::exponential_expr() ()
#24 0x00000000006f4e7d in GDLParser::multiplicative_expr() ()
#25 0x00000000006ced61 in GDLParser::signed_multiplicative_expr() ()
#26 0x00000000006cf6dc in GDLParser::additive_expr() ()
#27 0x00000000006d05ca in GDLParser::relational_expr() ()
#28 0x00000000006d163a in GDLParser::boolean_expr() ()
#29 0x00000000006d212a in GDLParser::logical_expr() ()
#30 0x00000000006d2a01 in GDLParser::expr() ()
#31 0x00000000006f9210 in GDLParser::statement() ()
#32 0x00000000006fd2e9 in GDLParser::compound_statement() ()
#33 0x00000000006fe550 in GDLParser::statement_list() ()
#34 0x00000000006ff054 in GDLParser::procedure_def() ()
#35 0x0000000000700e44 in GDLParser::translation_unit() ()
#36 0x0000000000c68065 in GDLInterpreter::CompileFile(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, bool) ()
#37 0x0000000000c6bf1a in GDLInterpreter::SearchCompilePro(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, bool) ()
#38 0x0000000000c6c215 in GDLInterpreter::GetProIx(ProgNode*) ()
#39 0x0000000000c6c7d9 in GDLInterpreter::SetProIx(ProgNode*) ()
#40 0x0000000000f8f7e4 in PCALLNode::Run() ()
#41 0x000000000068b5e6 in GDLInterpreter::statement(ProgNode*) ()
#42 0x000000000068c908 in GDLInterpreter::call_pro(ProgNode*) ()
#43 0x0000000000f8f963 in PCALLNode::Run() ()
#44 0x000000000068b5e6 in GDLInterpreter::statement(ProgNode*) ()
#45 0x000000000068b868 in GDLInterpreter::interactive(ProgNode*) ()
#46 0x0000000000c6a630 in DInterpreter::ExecuteLine(std::istream*, unsigned long long) ()
#47 0x0000000000c6b526 in DInterpreter::InterpreterLoop(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::allocator<std::__cxx11::basic_string<char, std::char_traits, std::allocator > > >&, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&) ()
#48 0x0000000000647811 in main ()

This is what I get with GDL version

GDL> !gdl
{
"RELEASE": "1.0.0 Git",
"BUILD_DATE": "Sep 23 2021",
"EPOCH": 1632366000,
"GDL_USE_DSFMT": 1,
"GDL_USE_WX": 1,
"GDL_POSIX": 1
}

==13621== Mismatched free() / delete / delete []
==13621== at 0x484171B: operator delete(void*) (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==13621== by 0x1086307: lib::draw_polyline(GDLGStream*, Data_, Data_, double, double, bool, bool, bool, int, bool, bool, Data_) (in /usr/local/bin/gdl)
==13621== by 0x1043EC8: lib::oplot_call::old_body(EnvT, GDLGStream*) (in /usr/local/bin/gdl)
==13621== by 0x104270E: lib::oplot(EnvT*) (in /usr/local/bin/gdl)
==13621== by 0x1094CC8: PCALL_LIBNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== Address 0xff3eaf0 is 0 bytes inside a block of size 20 alloc'd
==13621== at 0x483E7B5: malloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==13621== by 0x1085928: lib::draw_polyline(GDLGStream*, Data_, Data_, double, double, bool, bool, bool, int, bool, bool, Data_) (in /usr/local/bin/gdl)
==13621== by 0x1043EC8: lib::oplot_call::old_body(EnvT, GDLGStream*) (in /usr/local/bin/gdl)
==13621== by 0x104270E: lib::oplot(EnvT*) (in /usr/local/bin/gdl)
==13621== by 0x1094CC8: PCALL_LIBNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621==
==13621== Mismatched free() / delete / delete []
==13621== at 0x484171B: operator delete(void*) (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==13621== by 0x1043EC8: lib::oplot_call::old_body(EnvT*, GDLGStream*) (in /usr/local/bin/gdl)
==13621== by 0x104270E: lib::oplot(EnvT*) (in /usr/local/bin/gdl)
==13621== by 0x1094CC8: PCALL_LIBNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A0B07: GDLInterpreter::interactive(ProgNode*) (in /usr/local/bin/gdl)
==13621== Address 0xfaff520 is 0 bytes inside a block of size 20 alloc'd
==13621== at 0x483E7B5: malloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==13621== by 0x108591D: lib::draw_polyline(GDLGStream*, Data_, Data_, double, double, bool, bool, bool, int, bool, bool, Data_) (in /usr/local/bin/gdl)
==13621== by 0x1043EC8: lib::oplot_call::old_body(EnvT, GDLGStream*) (in /usr/local/bin/gdl)
==13621== by 0x104270E: lib::oplot(EnvT*) (in /usr/local/bin/gdl)
==13621== by 0x1094CC8: PCALL_LIBNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x6A1BA7: GDLInterpreter::call_pro(ProgNode*) (in /usr/local/bin/gdl)
==13621== by 0x1098AA2: PCALLNode::Run() (in /usr/local/bin/gdl)
==13621== by 0x6A0885: GDLInterpreter::statement(ProgNode*) (in /usr/local/bin/gdl)
==13621==

and later on

==13621== Warning: client switching stacks? SP change: 0x1ffeffd580 --> 0x1ffe7fd4e8
==13621== to suppress, use: --max-stackframe=8388760 or greater
==13621== Invalid write of size 8
==13621== at 0xCB60CC: lib::copy_basic(char const*, char const*) (in /usr/local/bin/gdl)
==13621== Address 0x1ffe7fd4e8 is on thread 1's stack
==13621==
==13621==
==13621== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==13621== Access not within mapped region at address 0x1FFE7FD4E8
==13621== at 0xCB60CC: lib::copy_basic(char const*, char const*) (in /usr/local/bin/gdl)
==13621== If you believe this happened as a result of a stack
==13621== overflow in your program's main thread (unlikely but
==13621== possible), you can try to increase the size of the
==13621== main thread stack using the --main-stacksize= flag.
==13621== The main thread stack size used in this run was 20480000.
==13621== Invalid write of size 8
==13621== at 0x4835110: _vgnU_freeres (in /usr/libexec/valgrind/vgpreload_core-amd64-linux.so)
==13621== Address 0x1ffe7fd4e0 is on thread 1's stack
==13621==
==13621==
==13621== Process terminating with default action of signal 11 (SIGSEGV)
==13621== Access not within mapped region at address 0x1FFE7FD4E0
==13621== at 0x4835110: _vgnU_freeres (in /usr/libexec/valgrind/vgpreload_core-amd64-linux.so)
==13621== If you believe this happened as a result of a stack
==13621== overflow in your program's main thread (unlikely but
==13621== possible), you can try to increase the size of the
==13621== main thread stack using the --main-stacksize= flag.
==13621== The main thread stack size used in this run was 20480000.
==13621==
==13621== HEAP SUMMARY:
==13621== in use at exit: 66,359,568 bytes in 169,506 blocks
==13621== total heap usage: 9,344,636 allocs, 9,175,130 frees, 3,017,718,309 bytes allocated
==13621==
==13621== LEAK SUMMARY:
==13621== definitely lost: 239,620 bytes in 696 blocks
==13621== indirectly lost: 135,229 bytes in 5,338 blocks
==13621== possibly lost: 5,890 bytes in 79 blocks
==13621== still reachable: 65,885,021 bytes in 162,720 blocks
==13621== of which reachable via heuristic:
==13621== newarray : 776 bytes in 1 blocks
==13621== multipleinheritance: 270,336 bytes in 1 blocks
==13621== suppressed: 0 bytes in 0 blocks
==13621== Rerun with --leak-check=full to see details of leaked memory
==13621==
==13621== For lists of detected and suppressed errors, rerun with: -s
==13621== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)

How could I debug further?
With which parameters should I call valgrind?
Is GDB better for debugging?

Any hint is welcome.
Thanks
@GillesDuvert
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it looks like a double free() in draw_polyline. Would you by any chance use PLOT or PLOTS on a data array that has been retrieved externally (through call_external as you mention it)?

@alaingdl
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alaingdl commented Sep 25, 2021 •
edited
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Thanks for the report :(
Could you try to extract the line or the few lines in GDL which give the crash ?
After that, it is very simple locally to check with Valgring or when adding flags at compilation.
Without being able to reproduce/trigger the issue, it is more difficult.
As an illustration #1030 (comment)

@brandy125
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brandy125 commented Sep 27, 2021 via email

@brandy125
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Well, for now it seems like if I do:
GDL>.compile program_b
GDL>program_a
GDL>program_b

does not lead to segfault.
I tried already some combinations and no segfault any more if I compile the program(s) in the beginning.

@GillesDuvert GillesDuvert changed the title getting constantly segmentation fault. Please help Strange case of Segfault Dec 2, 2021
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@GillesDuvert @alaingdl @brandy125