[Mono-dev] Shutdown hangs

Mon Jul 18 22:09:50 UTC 2016

I too am interested in this.  We (naively) approached our Microsoft
contacts about getting this support, and it quickly went in a completely
different direction (why don¹t you run on Azure on Windows machines!).

Miguel, does Xamarin offer paid support for Mono on Linux as opposed to
Mobile?

― ― ― 

Glover E. George
Computer Scientist
Information Technology Laboratory
US Army Engineer Research and Development Center
Vicksburg, MS 39180
601-634-4730

On 7/18/16, 4:48 PM, "mono-devel-list-bounces at lists.dot.net on behalf of
Chris Swiedler" <mono-devel-list-bounces at lists.dot.net on behalf of
cswiedler at trionworlds.com> wrote:

>Does Xamarin (or anyone else) offer paid support for server-side mono
>issues like this? The support offerings on their website only mention
>mobile apps.
>
>chris
>
>-----Original Message-----
>From: Chris Swiedler
>Sent: Tuesday, July 12, 2016 9:19 AM
>To: 'Chris Swiedler' <cswiedler at trionworlds.com>; mono-devel-list
><mono-devel-list at lists.ximian.com>
>Subject: RE: Shutdown hangs
>
>Switching to mono 4.0.5 seems a little better, but the problem (or a
>similar problem) is still there, and I get segfaults and other problems
>with 4.0.
>
>Does anyone have any suggestions for brute-force ways to fix this
>problem? E.g., can I modify ves_icall_System_Environment_Exit or similar
>to just call exit()? I haven't looked at the code but from the call
>stacks it seems like this happens in an attempt to make an orderly
>shutdown of threads. While that would be nice, it's much more important
>to me for the application to actually exit. If I have to, I'll make the
>process kill itself with SIGKILL, but I'd rather not since then I lose
>the actual exit code.
>
>chris
>
>-----Original Message-----
>From: mono-devel-list-bounces at lists.ximian.com
>[mailto:mono-devel-list-bounces at lists.ximian.com] On Behalf Of Chris
>Swiedler
>Sent: Monday, June 13, 2016 9:55 AM
>To: mono-devel-list <mono-devel-list at lists.ximian.com>
>Subject: [Mono-dev] Shutdown hangs
>
>I'm getting semi-reliable shutdown hangs in a mono command-line app using
>mono 4.2.3 on Centos 7 64-bit. The app does different things at different
>times, and the shutdowns only seem to happen when it connects to our SQL
>server database (using the Mono database bindings, not ODBC). We've also
>seen an occasional segfault, also seemingly only when doing database
>work, though those may have gone away since upgrading to 4.2.3.
>
>Does anyone have any thoughts? Pstack output below.
>
>Thanks,
>chris
>
>
>Thread 5 (Thread 0x7f4c777ff700 (LWP 11658)):
>#0  pthread_cond_wait@@GLIBC_2.3.2 () at
>../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>#1  0x00000000005f786c in thread_func (thread_data=0x0) at
>sgen-thread-pool.c:118
>#2  0x00007f4c77ffedf5 in start_thread (arg=0x7f4c777ff700) at
>pthread_create.c:308
>#3  0x00007f4c77d2c1ad in clone () at
>../sysdeps/unix/sysv/linux/x86_64/clone.S:113
>
>Thread 4 (Thread 0x7f4c75560700 (LWP 11659)):
>#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>#1  0x000000000061aa37 in mono_sem_wait (sem=sem at entry=0x953c40
><finalizer_sem>, alertable=alertable at entry=1) at mono-semaphore.c:107
>#2  0x00000000005a1736 in finalizer_thread (unused=<optimized out>) at
>gc.c:1096
>#3  0x00000000005841e9 in start_wrapper_internal (data=<optimized out>)
>at threads.c:725
>#4  start_wrapper (data=<optimized out>) at threads.c:772
>#5  0x0000000000621026 in inner_start_thread (arg=0x7fffda0d42e0) at
>mono-threads-posix.c:97
>#6  0x00007f4c77ffedf5 in start_thread (arg=0x7f4c75560700) at
>pthread_create.c:308
>#7  0x00007f4c77d2c1ad in clone () at
>../sysdeps/unix/sysv/linux/x86_64/clone.S:113
>
>Thread 3 (Thread 0x7f4c74fd3700 (LWP 11660)):
>#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>#1  0x000000000061aa37 in mono_sem_wait (sem=sem at entry=0x7f4c68000940,
>alertable=alertable at entry=0) at mono-semaphore.c:107
>#2  0x000000000061f5ba in mono_thread_info_wait_for_resume
>(info=<optimized out>) at mono-threads.c:110
>#3  mono_thread_info_end_self_suspend () at mono-threads.c:692
>#4  0x0000000000583d2c in self_suspend_internal (thread=0x7f4c78a74330)
>at threads.c:4546
>#5  mono_thread_execute_interruption (thread=thread at entry=0x7f4c78a74330)
>at threads.c:4050
>#6  0x0000000000583f50 in mono_thread_interruption_checkpoint_request
>(bypass_abort_protection=bypass_abort_protection at entry=1) at
>threads.c:4184
>#7  0x0000000000584dae in mono_thread_force_interruption_checkpoint () at
>threads.c:4221
>
>Thread 2 (Thread 0x7f4c746ff700 (LWP 11661)):
>#0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>#1  0x000000000061aa37 in mono_sem_wait (sem=sem at entry=0x7f4c6c000940,
>alertable=alertable at entry=0) at mono-semaphore.c:107
>#2  0x000000000061f5ba in mono_thread_info_wait_for_resume
>(info=<optimized out>) at mono-threads.c:110
>#3  mono_thread_info_end_self_suspend () at mono-threads.c:692
>#4  0x0000000000583d2c in self_suspend_internal (thread=0x7f4c78a74430)
>at threads.c:4546
>#5  mono_thread_execute_interruption (thread=thread at entry=0x7f4c78a74430)
>at threads.c:4050
>#6  0x00000000005851f9 in
>ves_icall_System_Threading_Thread_Sleep_internal (ms=1000) at
>threads.c:1206
>#17 0x00007f4c756fa2e7 in System_Threading_Thread_Sleep_int
>(millisecondsTimeout=1000) at
>/home/cswiedler/mono-main/Extern/mono/source/external/referencesource/msco
>rlib/system/threading/thread.cs:715
>
>Thread 1 (Thread 0x7f4c78b34780 (LWP 11657)):
>#0  0x00007f4c7800599d in nanosleep () at
>../sysdeps/unix/syscall-template.S:81
>#1  0x0000000000632a5a in monoeg_g_usleep (microseconds=1935890) at
>gdate-unix.c:53
>#2  0x000000000061f2bb in suspend_sync_nolock
>(id=id at entry=139966347736832, interrupt_kernel=interrupt_kernel at entry=1)
>at mono-threads.c:870
>#3  0x000000000061f732 in mono_thread_info_safe_suspend_and_run
>(id=139966347736832, interrupt_kernel=interrupt_kernel at entry=1,
>callback=callback at entry=0x5813c0 <suspend_thread_critical>,
>user_data=user_data at entry=0x7fffda0d3a10) at mono-threads.c:891
>#4  0x0000000000581d29 in suspend_thread_internal (thread=0x7f4c78a74430,
>interrupt=1) at threads.c:4531
>#5  0x00000000005834ff in mono_thread_suspend_all_other_threads () at
>threads.c:3154
>#6  0x0000000000538176 in ves_icall_System_Environment_Exit (result=0) at
>icall.c:6006
>#7  0x0000000040731832 in ?? ()
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