[Mono-dev] Native stack trace in mono-2-10

[Bassam Tabbara]

Hello,

We are seeing the following crash quite frequently on our test servers:

#0  0x00007fe188725165 in raise () from /lib/libc.so.6
#1  0x00007fe188727f70 in abort () from /lib/libc.so.6
#2  0x0000000000493298 in mono_handle_native_sigsegv (signal=2086645120, ctx=<value optimized out>) at mini-exceptions.c:2245
#3  0x00000000004e6c8d in mono_arch_handle_altstack_exception (sigctx=0x7fe18390fac0, fault_addr=<value optimized out>,
    stack_ovf=0) at exceptions-amd64.c:956
#4  0x0000000000417704 in mono_sigsegv_signal_handler (_dummy=11, info=0x7fe18390fbf0, context=0x7fe18390fac0) at mini.c:5881
#5  <signal handler called>
#6  0x00007fe1887fbc0b in ?? () from /lib/libc.so.6
#7  0x000000000041e751 in mono_jit_compile_method_with_opt (method=0x178c180, opt=51472895, ex=0x7fe15cd65040) at mini.c:5342
#8  0x000000000041eefe in mono_jit_compile_method (method=0x600311) at mini.c:5403
#9  0x0000000000496eaf in common_call_trampoline (regs=0x7fe15cd652f0, code=0x41ff0290 "\353", <incomplete sequence \344>,
    m=0x178c180, tramp=<value optimized out>, vt=0x0, vtable_slot=0x0, need_rgctx_tramp=0) at mini-trampolines.c:488
#10 0x00000000004977cd in mono_magic_trampoline (regs=0x600311, code=0x600311 "__icall_wrapper_", arg=0x5f,
    tramp=0x8 <Address 0x8 out of bounds>) at mini-trampolines.c:590
#11 0x0000000041d5116a in ?? ()
#12 0x00007fe15cd65158 in ?? ()
#13 0x00000000005e2d2b in monoeg_g_hash_table_lookup (hash=0x178c180, key=0x7fe15cd653e8) at ghashtable.c:280
#14 0x0000000041ff0290 in ?? ()
#15 0x0000000000000000 in ?? ()

The servers is an x64 running Debian Linux 6.

The back trace looks odd in that g_hash_table_lookup is calling a trampoline. Is this memory corruption? Any ideas on how to debug this?

Thanks!
Bassam

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