[Mono-dev] Mono crash

mono user mono.user789 at gmail.com
Fri Sep 5 17:26:48 UTC 2014 

It was suggested I try the boehm garbage collector. My code dies quickly,
saying "Too many heap sections: Increase MAXHINCR or MAX_HEAP_SECTS"

It was also suggested the reason might be that I am running out of memory.
That is a possibility, though I now have a crash that happens when Mono is
using about 12G of virtual space on a 64G machine. I still wanted to verify
if the reason was a failed allocation, and ran mono in a debugger. The code
then executed fine, suggesting that lack of resources might not be the
reason for the crashes. The same code fails reliably when started from the
command line. Having said that, something probably does think that memory
has run out. I have seen error messages along the lines of "Error: Garbage
collector could not allocate 16384 bytes of memory for major heap section."
even though there is plenty of memory available. I have also seen clean
out-of-memory crashes (i.e. my code terminates cleanly with a clear error
message and no mono stacktrace(s)).

I am afraid I cannot provide an example, except possibly if we can narrow
down the cause so I can reproduce the crash using a small amount of code
and without using any proprietary data (that is currently needed to
reproduce the crashes). I am running 3.0.8.

Many thanks for any help/suggestions/etc.



On 22 August 2014 15:55, 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.
> =================================================================
>
>
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