Hey Felix,

You should install the debug symbols from your distro as there's nothing we
can say from an incomplete backtrace.

--
Rodrigo

On Thu, Sep 22, 2016 at 2:18 AM, Felix Berlakovich <fe...@berlakovich.at>
wrote:

> Hi!
>
>
>
> I have a problem with a ASP.NET ServiceStack (3.9.72) application and
> mod-mono-server. I am running the application on Debian 8.5 with Apache
> 2.4.10 and mono 4.6 with Debian packages from mono-project.com.
> Everything works as expected except for a shutdown of the mod-mono-server.
> The shutdown occurs either on apache restart, apache stop or
> mod-mono-server –terminate. My application is shutdown properly
> (Application_End is executed), but then the mono process goes into a CPU
> loop. In case of apache restart a new process is spawned afterwards, but
> the hanging process remains. The hanging process can only be killed with
> kill -9.
>
>
>
> My observations so far:
>
> ·         The hang does not occur with nginx + hyperfastcgi, so it cannot
> be a general problem with my application. I would strongly prefer apache
> though.
>
> ·         The hang does not occur with the mono ASP.NET example
> application
>
> ·         The hang occurs only after my application was loaded by
> mod-mono-server, i.e. at least one request to the application is needed
> before the shutdown
>
> ·         mod-mono-server logs a “mod-mono-server received a shutdown
> message” message before the hang
>
>
>
> I have traced a shutdown of mod-mono-server and attached the tail of the
> log at [1]. Furthermore I attached to the hanging process with gdb and
> issued a thread apply all bt. The output is attached at [2]. I am
> completely out of ideas on how to further troubleshoot this problem.
>
>
>
> Regards
>
>
>
> Felix
>
>
>
> [1] tail of a traced mod-mono-server shutdown:
>
>
>
> [Thread debugging using libthread_db enabled]
>
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>
> sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>
> 85      ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Datei oder
> Verzeichnis nicht gefunden.
>
>   Id   Target Id         Frame
>
>   10   Thread 0x7f76d6fff700 (LWP 17622) "SGen worker" 
> pthread_cond_wait@@GLIBC_2.3.2
> () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>
>   9    Thread 0x7f76d4fd2700 (LWP 17623) "Finalizer" sem_wait () at
> ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>
>   8    Thread 0x7f76cffff700 (LWP 17625) "Main" 0x00007f76d83bdaed in poll
> () at ../sysdeps/unix/syscall-template.S:81
>
>   7    Thread 0x7f76cffbe700 (LWP 17626) "Main" pthread_cond_timedwait@
> @GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_
> timedwait.S:238
>
>   6    Thread 0x7f76cff7d700 (LWP 17627) "Threadpool work"
> 0x00007f76d83afbb7 in sched_yield () at ../sysdeps/unix/syscall-
> template.S:81
>
>   5    Thread 0x7f76cfd7c700 (LWP 17628) "Threadpool work"
> 0x00007f76d88ae4c9 in __libc_waitpid (pid=17645, stat_loc=0x7f76d91f411c,
> options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:40
>
>   4    Thread 0x7f76cfb7b700 (LWP 17629) "Threadpool work"
> 0x00007f76d83b9bbd in read () at ../sysdeps/unix/syscall-template.S:81
>
>   3    Thread 0x7f76ce6fb700 (LWP 17633) "Timer-Scheduler"
> pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/
> linux/x86_64/pthread_cond_timedwait.S:238
>
>   2    Thread 0x7f76d423f700 (LWP 17644) "Threadpool work"
> 0x00007f76d83afbb7 in sched_yield () at ../sysdeps/unix/syscall-
> template.S:81
>
> * 1    Thread 0x7f76d93d8740 (LWP 17621) "Main" sem_wait () at
> ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>
>
>
> Thread 10 (Thread 0x7f76d6fff700 (LWP 17622)):
>
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/
> linux/x86_64/pthread_cond_wait.S:185
>
> #1  0x0000000000623dc7 in ?? ()
>
> #2  0x00007f76d88a70a4 in start_thread (arg=0x7f76d6fff700) at
> pthread_create.c:309
>
> #3  0x00007f76d83c662d in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:111
>
>
>
> Thread 9 (Thread 0x7f76d4fd2700 (LWP 17623)):
>
> #0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>
> #1  0x00000000005bbc99 in ?? ()
>
> #2  0x000000000059c87c in ?? ()
>
> #3  0x0000000000653eec in ?? ()
>
> #4  0x00007f76d88a70a4 in start_thread (arg=0x7f76d4fd2700) at
> pthread_create.c:309
>
> #5  0x00007f76d83c662d in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:111
>
>
>
> Thread 8 (Thread 0x7f76cffff700 (LWP 17625)):
>
> #0  0x00007f76d83bdaed in poll () at ../sysdeps/unix/syscall-template.S:81
>
> #1  0x00000000005a2d8f in ?? ()
>
> #2  0x00000000005a3da3 in ?? ()
>
> #3  0x000000000059c87c in ?? ()
>
> #4  0x0000000000653eec in ?? ()
>
> #5  0x00007f76d88a70a4 in start_thread (arg=0x7f76cffff700) at
> pthread_create.c:309
>
> #6  0x00007f76d83c662d in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:111
>
>
>
> Thread 7 (Thread 0x7f76cffbe700 (LWP 17626)):
>
> #0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/
> linux/x86_64/pthread_cond_timedwait.S:238
>
> #1  0x0000000000652375 in ?? ()
>
> #2  0x00000000005a12e8 in ?? ()
>
> #3  0x000000000059c87c in ?? ()
>
> #4  0x0000000000653eec in ?? ()
>
> #5  0x00007f76d88a70a4 in start_thread (arg=0x7f76cffbe700) at
> pthread_create.c:309
>
> #6  0x00007f76d83c662d in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:111
>
>
>
> Thread 6 (Thread 0x7f76cff7d700 (LWP 17627)):
>
> #0  0x00007f76d83afbb7 in sched_yield () at ../sysdeps/unix/syscall-
> template.S:81
>
> #1  0x0000000000653dd9 in ?? ()
>
> #2  0x0000000000479f05 in ?? ()
>
> #3  0x000000004067e4ac in ?? ()
>
> #4  0x00007f76ce7abe98 in ?? ()
>
> #5  0x00007f76cff7c6e8 in ?? ()
>
> #6  0x0000000000000031 in ?? ()
>
> #7  0x00007f76cff7c6e0 in ?? ()
>
> #8  0x0000000000000031 in ?? ()
>
> #9  0x00007f76cff7c6c0 in ?? ()
>
> #10 0x0000000000000000 in ?? ()
>
>
>
> Thread 5 (Thread 0x7f76cfd7c700 (LWP 17628)):
>
> #0  0x00007f76d88ae4c9 in __libc_waitpid (pid=17645,
> stat_loc=0x7f76d91f411c, options=0) at ../sysdeps/unix/sysv/linux/
> waitpid.c:40
>
> #1  0x00000000004acd59 in ?? ()
>
> #2  0x00000000005040fe in ?? ()
>
> #3  0x00000000004275d7 in ?? ()
>
> #4  <signal handler called>
>
> #5  0x000000000047a2b8 in ?? ()
>
> #6  0x0000000040cb8984 in ?? ()
>
> #7  0x00007f76cdce92b0 in ?? ()
>
> #8  0x0000000002c294a0 in ?? ()
>
> #9  0x0000000000000000 in ?? ()
>
>
>
> Thread 4 (Thread 0x7f76cfb7b700 (LWP 17629)):
>
> #0  0x00007f76d83b9bbd in read () at ../sysdeps/unix/syscall-template.S:81
>
> #1  0x0000000040692807 in ?? ()
>
> #2  0x00007f76d73246f8 in ?? ()
>
> #3  0x00007f76b8001950 in ?? ()
>
> #4  0x00007f76d7324688 in ?? ()
>
> #5  0x00007f76cfb7a780 in ?? ()
>
> #6  0x00007f76cfb7a730 in ?? ()
>
> #7  0x00007f76d73246f8 in ?? ()
>
> #8  0x00007f76d7324688 in ?? ()
>
> #9  0x00007f76d7325a48 in ?? ()
>
> #10 0x0000000000000020 in ?? ()
>
> #11 0x00007f76d7324610 in ?? ()
>
> #12 0x00007f76cfb7a820 in ?? ()
>
> #13 0x000000004069259c in ?? ()
>
> #14 0x00000000000000ff in ?? ()
>
> #15 0xffffffffffffffff in ?? ()
>
> #16 0xe000fa03dd00fa03 in ?? ()
>
> #17 0x0000000000000000 in ?? ()
>
>
>
> Thread 3 (Thread 0x7f76ce6fb700 (LWP 17633)):
>
> #0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/
> linux/x86_64/pthread_cond_timedwait.S:238
>
> #1  0x000000000062a1c8 in ?? ()
>
> #2  0x000000000063fedd in ?? ()
>
> #3  0x000000000059c5b7 in ?? ()
>
> #4  0x000000000059d876 in ?? ()
>
> #5  0x000000004070d1ec in ?? ()
>
> #6  0x00007f76d70eafa8 in ?? ()
>
> #7  0x00007f76ac001950 in ?? ()
>
> #8  0x00007f76d70eafa8 in ?? ()
>
> #9  0x00007f76ce6fa540 in ?? ()
>
> #10 0x00007f76ce6fa4f0 in ?? ()
>
> #11 0x0000000000000001 in ?? ()
>
> #12 0x00007f76d70eafa8 in ?? ()
>
> #13 0x00007f76d70eaf70 in ?? ()
>
> #14 0x00000000000003e6 in ?? ()
>
> #15 0x0000000000000000 in ?? ()
>
>
>
> Thread 2 (Thread 0x7f76d423f700 (LWP 17644)):
>
> #0  0x00007f76d83afbb7 in sched_yield () at ../sysdeps/unix/syscall-
> template.S:81
>
> #1  0x0000000000653dd9 in ?? ()
>
> #2  0x0000000000479f05 in ?? ()
>
> #3  0x000000004058ef64 in ?? ()
>
> #4  0x0000000000000000 in ?? ()
>
>
>
> Thread 1 (Thread 0x7f76d93d8740 (LWP 17621)):
>
> #0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>
> #1  0x0000000000650e50 in ?? ()
>
> #2  0x0000000000599e1d in ?? ()
>
> #3  0x000000000059ea63 in mono_thread_manage ()
>
> #4  0x000000000047eb52 in mono_main ()
>
> #5  0x0000000000422258 in ?? ()
>
> #6  0x00007f76d82ffb45 in __libc_start_main (main=0x422160, argc=9,
> argv=0x7ffd524d96c8, init=<optimized out>, fini=<optimized out>,
> rtld_fini=<optimized out>, stack_end=0x7ffd524d96b8) at libc-start.c:287
>
> #7  0x0000000000422651 in _start ()
>
>
>
> =================================================================
>
> 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.
>
> =================================================================
>
>
>
> [0x7f76cfd7c700: 9,79980 14] ENTER: (wrapper delegate-invoke)
> <Module>:invoke_void_object_EventArgs (object,System.EventArgs)(
> this:0x7f76cdce92b0[System.EventHandler a005241e],
>
>
>
>
>
> [2] gdb thread apply all bt in the hanging mono process
>
>
>
> Thread 5 (Thread 0x7fa95d7ff700 (LWP 17716)):
>
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/
> linux/x86_64/pthread_cond_wait.S:185
>
> #1  0x0000000000623dc7 in ?? ()
>
> #2  0x00007fa95ecfa0a4 in start_thread (arg=0x7fa95d7ff700) at
> pthread_create.c:309
>
> #3  0x00007fa95e81962d in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:111
>
>
>
> Thread 4 (Thread 0x7fa95b434700 (LWP 17771)):
>
> #0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>
> #1  0x00000000005bbc99 in ?? ()
>
> #2  0x000000000059c87c in ?? ()
>
> #3  0x0000000000653eec in ?? ()
>
> #4  0x00007fa95ecfa0a4 in start_thread (arg=0x7fa95b434700) at
> pthread_create.c:309
>
> #5  0x00007fa95e81962d in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:111
>
>
>
> Thread 3 (Thread 0x7fa95a1f3700 (LWP 17783)):
>
> #0  sem_timedwait () at ../nptl/sysdeps/unix/sysv/
> linux/x86_64/sem_timedwait.S:101
>
> #1  0x0000000000651868 in ?? ()
>
> #2  0x0000000000652b14 in ?? ()
>
> #3  0x0000000000598fac in ?? ()
>
> #4  0x000000000059b93e in ?? ()
>
> #5  0x0000000000546146 in ?? ()
>
> #6  0x0000000042501901 in ?? ()
>
> #7  0x0000000000000000 in ?? ()
>
>
>
> Thread 2 (Thread 0x7fa931cff700 (LWP 17795)):
>
> #0  0x00007fa95e7663e2 in do_sigsuspend (set=0x98c340) at
> ../sysdeps/unix/sysv/linux/sigsuspend.c:31
>
> #1  __GI___sigsuspend (set=0x98c340) at ../sysdeps/unix/sysv/linux/
> sigsuspend.c:45
>
> #2  0x00000000006543de in ?? ()
>
> #3  <signal handler called>
>
> #4  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/
> linux/x86_64/pthread_cond_wait.S:185
>
> #5  0x000000000062a2e1 in ?? ()
>
> #6  0x0000000000640044 in ?? ()
>
> #7  0x00000000005a1f3b in ?? ()
>
> #8  0x00000000005b597f in ?? ()
>
> #9  0x0000000000653eec in ?? ()
>
> #10 0x00007fa95ecfa0a4 in start_thread (arg=0x7fa931cff700) at
> pthread_create.c:309
>
> #11 0x00007fa95e81962d in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:111
>
>
>
> Thread 1 (Thread 0x7fa95f82b740 (LWP 17711)):
>
> #0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>
> #1  0x0000000000650e50 in ?? ()
>
> #2  0x0000000000599e1d in ?? ()
>
> #3  0x000000000059ea63 in mono_thread_manage ()
>
> #4  0x000000000047eb52 in mono_main ()
>
> #5  0x0000000000422258 in ?? ()
>
> #6  0x00007fa95e752b45 in __libc_start_main (main=0x422160, argc=9,
> argv=0x7ffccf689c28, init=<optimized out>, fini=<optimized out>,
> rtld_fini=<optimized out>, stack_end=0x7ffccf689c18) at libc-start.c:287
>
> #7  0x0000000000422651 in _start ()
>
> _______________________________________________
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>
>
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