[Mono-dev] Mono crash

mono user mono.user789 at gmail.com
Fri Aug 22 15:42:59 UTC 2014 

> Can you provide a test case?

The crash is in a closed-source proprietary application. Furthermore, it is
triggered by a specific input that certainly cannot be published.

I may be able to provide an example if the problem can be isolated to a
small part of the application. I am afraid that different runs on the same
input tend to produce very different stacktraces, so I am not too
optimistic about that. But if someone could suggest where to look, that
would be a start.

I suppose that the example would need to be an executable with instructions
that say "run this until it crashes". Maybe I could do whatever the next
step in finding the problem would be on my computer, and report the results?


On 22 August 2014 15:57, Juan Cristóbal Olivares <cristobal at cxsoftware.com>
wrote:

> Can you provide a test case?
>
>
> On Fri, Aug 22, 2014 at 10:55 AM, mono user <mono.user789 at gmail.com>
> wrote:
>
>> Is there anything I can do to avoid the following crash? I am running
>> Mono 3.6.0. I am not using any native libraries that don't ship witth Mono.
>> Many thanks.
>>
>>
>> Stacktrace:
>>
>>
>> Native stacktrace:
>>
>>
>> Debug info from gdb:
>>
>> Mono support loaded.
>> [Thread debugging using libthread_db enabled]
>> [New Thread 0x7fba882d4700 (LWP 7103)]
>> [New Thread 0x7fba88315700 (LWP 7102)]
>> [New Thread 0x7fba833d0700 (LWP 7100)]
>> [New Thread 0x7fba88b0e700 (LWP 7099)]
>> 0x00007fba90992cd4 in sigsuspend () from /lib64/libc.so.6
>>   5 Thread 0x7fba88b0e700 (LWP 7099)  0x00007fba90992cd4 in sigsuspend ()
>> from /lib64/libc.so.6
>>   4 Thread 0x7fba833d0700 (LWP 7100)  0x00007fba90d032ad in waitpid ()
>> from /lib64/libpthread.s        o.0
>>   3 Thread 0x7fba88315700 (LWP 7102)  0x00007fba90a49163 in epoll_wait ()
>> from /lib64/libc.so.6
>>   2 Thread 0x7fba882d4700 (LWP 7103)  0x00007fba90d01a21 in sem_timedwait
>> () from /lib64/libpth        read.so.0
>> * 1 Thread 0x7fba917ab780 (LWP 7098)  0x00007fba90992cd4 in sigsuspend ()
>> from /lib64/libc.so.6
>>
>> Thread 5 (Thread 0x7fba88b0e700 (LWP 7099)):
>> #0  0x00007fba90992cd4 in sigsuspend () from /lib64/libc.so.6
>> #1  0x00000000005cac54 in suspend_thread (sig=<value optimized out>,
>> siginfo=<value optimized o        ut>, context=0x7fba88b0d780) at
>> sgen-os-posix.c:113
>> #2  suspend_handler (sig=<value optimized out>, siginfo=<value optimized
>> out>, context=0x7fba88        b0d780) at sgen-os-posix.c:140
>> #3  <signal handler called>
>> #4  0x00007fba90d0192e in sem_wait () from /lib64/libpthread.so.0
>> #5  0x000000000062c488 in mono_sem_wait (sem=0x977ca0, alertable=1) at
>> mono-semaphore.c:101
>> #6  0x00000000005a501a in finalizer_thread (unused=<value optimized out>)
>> at gc.c:1073
>> #7  0x00000000005823ab in start_wrapper_internal (data=<value optimized
>> out>) at threads.c:660
>> #8  start_wrapper (data=<value optimized out>) at threads.c:707
>> #9  0x0000000000631b16 in inner_start_thread (arg=<value optimized out>)
>> at mono-threads-posix.        c:100
>> #10 0x00007fba90cfb9d1 in start_thread () from /lib64/libpthread.so.0
>> #11 0x00007fba90a48b6d in clone () from /lib64/libc.so.6
>>
>> Thread 4 (Thread 0x7fba833d0700 (LWP 7100)):
>> #0  0x00007fba90d032ad in waitpid () from /lib64/libpthread.so.0
>> #1  0x00000000004a33f8 in mono_handle_native_sigsegv (signal=<value
>> optimized out>, ctx=<value         optimized out>) at mini-exceptions.c:2305
>> #2  0x00000000005005cf in mono_arch_handle_altstack_exception
>> (sigctx=0x7fba9173bac0, fault_add        r=<value optimized out>,
>> stack_ovf=0) at exceptions-amd64.c:905
>> #3  0x0000000000415b69 in mono_sigsegv_signal_handler (_dummy=11,
>> info=0x7fba9173bbf0, context=        0x7fba9173bac0) at mini.c:6842
>> #4  <signal handler called>
>> #5  alloc_sb (heap=0x979530) at lock-free-alloc.c:166
>> #6  alloc_from_new_sb (heap=0x979530) at lock-free-alloc.c:415
>> #7  mono_lock_free_alloc (heap=0x979530) at lock-free-alloc.c:459
>> #8  0x00000000005d4bc7 in sgen_alloc_internal (type=<value optimized
>> out>) at sgen-internal.c:1        69
>> #9  0x00000000005eda92 in sgen_gray_object_alloc_queue_section
>> (queue=0x978ba0) at sgen-gray.c:        58
>> #10 0x00000000005edadd in sgen_gray_object_enqueue (queue=0x978ba0,
>> obj=<value optimized out>)         at sgen-gray.c:96
>> #11 0x00000000005d0a1c in pin_objects_from_addresses
>> (section=0x7fba91744010, start=<value opti        mized out>,
>> end=0x7fb481428040, start_nursery=<value optimized out>, end_nursery=<value
>> optimiz        ed out>, ctx=...) at sgen-gc.c:987
>> #12 0x00000000005d0afb in sgen_pin_objects_in_section
>> (section=0x7fba91744010, ctx=...) at sgen        -gc.c:1025
>> #13 0x00000000005d2d81 in collect_nursery (unpin_queue=0x0,
>> finish_up_concurrent_mark=0) at sge        n-gc.c:2284
>> #14 0x00000000005d3d88 in sgen_perform_collection (requested_size=4096,
>> generation_to_collect=0        , reason=0x706be2 "Nursery full",
>> wait_to_finish=<value optimized out>) at sgen-gc.c:3174
>> #15 0x00000000005f0c64 in mono_gc_alloc_obj_nolock (vtable=0x7fb78073c190
>> 0xbcc240
>> 0xbcc240
>> 0x7fb78073c190
>> 0x7fb78073c190
>> vtable(%s), size=<value optimized out>) at sgen-alloc.c:314
>> #16 0x00000000005f1074 in mono_gc_alloc_obj (vtable=0x7fb78073c190
>> 0xbcc240
>> 0xbcc240
>> 0x7fb78073c190
>> 0x7fb78073c190
>> vtable(%s), size=40) at sgen-alloc.c:490
>> #17 0x0000000041e50e83 in ?? ()
>> #18 0x00007fb9fc0025d0 in ?? ()
>> #19 0x00007fb44dd3cda8 in ?? ()
>> #20 0x0000000000000028 in ?? ()
>> #21 0x00007fba8a778ef0 in ?? ()
>> #22 0x00007fba83279d20 in ?? ()
>> #23 0x00007fba8a553e58 in ?? ()
>> #24 0x00007fba8a553e30 in ?? ()
>> #25 0x00007fba833d06e0 in ?? ()
>> #26 0x00007fb780721a38 in ?? ()
>> #27 0x0000000041e4d004 in ?? ()
>> #28 0x00007fb4e5be8c70 in ?? ()
>> #29 0x0000000000000000 in ?? ()
>>
>> Thread 3 (Thread 0x7fba88315700 (LWP 7102)):
>> #0  0x00007fba90a49163 in epoll_wait () from /lib64/libc.so.6
>> #1  0x0000000000585e0a in tp_epoll_wait (p=0x9776a0) at
>> ../../mono/metadata/tpool-epoll.c:118
>> #2  0x00000000005823ab in start_wrapper_internal (data=<value optimized
>> out>) at threads.c:660
>> #3  start_wrapper (data=<value optimized out>) at threads.c:707
>> #4  0x0000000000631b16 in inner_start_thread (arg=<value optimized out>)
>> at mono-threads-posix.        c:100
>> #5  0x00007fba90cfb9d1 in start_thread () from /lib64/libpthread.so.0
>> #6  0x00007fba90a48b6d in clone () from /lib64/libc.so.6
>>
>> Thread 2 (Thread 0x7fba882d4700 (LWP 7103)):
>> #0  0x00007fba90d01a21 in sem_timedwait () from /lib64/libpthread.so.0
>> #1  0x000000000062c59c in mono_sem_timedwait (sem=0x977808,
>> timeout_ms=<value optimized out>, a        lertable=1) at
>> mono-semaphore.c:64
>> #2  0x00000000005870ea in async_invoke_thread (data=0x0) at
>> threadpool.c:1566
>> #3  0x00000000005823ab in start_wrapper_internal (data=<value optimized
>> out>) at threads.c:660
>> #4  start_wrapper (data=<value optimized out>) at threads.c:707
>> #5  0x0000000000631b16 in inner_start_thread (arg=<value optimized out>)
>> at mono-threads-posix.        c:100
>> #6  0x00007fba90cfb9d1 in start_thread () from /lib64/libpthread.so.0
>> #7  0x00007fba90a48b6d in clone () from /lib64/libc.so.6
>>
>> Thread 1 (Thread 0x7fba917ab780 (LWP 7098)):
>> #0  0x00007fba90992cd4 in sigsuspend () from /lib64/libc.so.6
>> #1  0x00000000005cac54 in suspend_thread (sig=<value optimized out>,
>> siginfo=<value optimized o        ut>, context=0x7fff0cb35880) at
>> sgen-os-posix.c:113
>> #2  suspend_handler (sig=<value optimized out>, siginfo=<value optimized
>> out>, context=0x7fff0c        b35880) at sgen-os-posix.c:140
>> #3  <signal handler called>
>> #4  0x00007fba90cff5ba in pthread_cond_wait@@GLIBC_2.3.2 () from
>> /lib64/libpthread.so.0
>> #5  0x000000000060c34c in _wapi_handle_timedwait_signal_handle
>> (handle=0x280a, timeout=0x0, ale        rtable=1, poll=<value optimized
>> out>) at handles.c:1596
>> #6  0x000000000061e7fb in WaitForSingleObjectEx (handle=0x280a,
>> timeout=4294967295, alertable=1        ) at wait.c:194
>> #7  0x000000000058122c in ves_icall_System_Threading_Thread_Join_internal
>> (this=0x7fba917102d0,         ms=-1, thread=0x280a) at threads.c:1306
>> #8  0x0000000041e653f9 in ?? ()
>> #9  0x0000000000a16d80 in ?? ()
>> #10 0x00007fff0cb363f0 in ?? ()
>> #11 0x00007fba8a4514a8 in ?? ()
>> #12 0x00007fff0cb36190 in ?? ()
>> #13 0x00007fff0cb35f80 in ?? ()
>> #14 0x0000000000a23e40 in ?? ()
>> #15 0x0000000000000000 in ?? ()
>>
>> =================================================================
>> Got a SIGSEGV while executing native code. This usually indicates
>> a fatal error in the mono runtime or one of the native libraries
>> used by your application.
>> =================================================================
>>
>>
>> _______________________________________________
>> Mono-devel-list mailing list
>> Mono-devel-list at lists.ximian.com
>> http://lists.ximian.com/mailman/listinfo/mono-devel-list
>>
>>
>
>
> --
> Atte,
> Juan Cristóbal Olivares
>
>
> *cxsoftware.com <http://www.cxsoftware.com/>*
> Skype: cxsoftware6001
> Celular: +56-9 9871 7277
> Central: +56-2 2348 7642
>
>
>
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