[Mono-dev] FW: Random hangs while running mono app

[Burkhard Linke]

Hi,

any updates on this? The bug affects the latest stable packages in the 
official xamarin repository, and nightly builds or building from source 
are not options.

Regards,
Burkhard

On 05/19/2016 04:30 PM, Burkhard Linke wrote:
> Hi,
>
> On 04/29/2016 04:12 PM, Rodrigo Kumpera wrote:
>> This looks like a shutdown bug in mono.
>>
>> Do you have a reliable way to reproduce it?
>> How loaded are the machines running your workload?
>
> We have encountered the same(?) bug on our compute cluster. 
> Applications process data, write output files, but do not terminate.
>
> (gdb) info threads
>   Id   Target Id         Frame
>   6    Thread 0x2b1f83200700 (LWP 63141) "mono" 
> pthread_cond_wait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   5    Thread 0x2b1f84cf3700 (LWP 63142) "Finalizer" sem_wait () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
>   4    Thread 0x2b1f87ee1700 (LWP 63143) "mono" 
> pthread_cond_timedwait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
>   3    Thread 0x2b1f8c81d700 (LWP 63148) "Timer-Scheduler" 
> pthread_cond_wait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
>   2    Thread 0x2b1fe1133700 (LWP 63248) "mono" 
> pthread_cond_wait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> * 1    Thread 0x2b1f81c98580 (LWP 63140) "mono" 
> pthread_cond_wait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> (gdb) thread apply all bt
>
> Thread 6 (Thread 0x2b1f83200700 (LWP 63141)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00000000005f9aec in ?? ()
> #2  0x00002b1f8259b182 in start_thread (arg=0x2b1f83200700) at 
> pthread_create.c:312
> #3  0x00002b1f828ab47d in clone () at 
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
>
> Thread 5 (Thread 0x2b1f84cf3700 (LWP 63142)):
> #0  sem_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S:85
> #1  0x000000000061de28 in mono_sem_wait ()
> #2  0x00000000005a2076 in ?? ()
> #3  0x00000000005843d3 in ?? ()
> #4  0x0000000000624666 in ?? ()
> #5  0x00002b1f8259b182 in start_thread (arg=0x2b1f84cf3700) at 
> pthread_create.c:312
> #6  0x00002b1f828ab47d in clone () at 
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
>
> Thread 4 (Thread 0x2b1f87ee1700 (LWP 63143)):
> #0  pthread_cond_timedwait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
> #1  0x00002b1f867ce29c in cl_thread_wait_for_thread_condition () from 
> /usr/lib/gridengine-drmaa/lib/libdrmaa.so
> #2  0x00002b1f867ce6d3 in cl_thread_wait_for_event () from 
> /usr/lib/gridengine-drmaa/lib/libdrmaa.so
> #3  0x00002b1f867b297f in ?? () from 
> /usr/lib/gridengine-drmaa/lib/libdrmaa.so
> #4  0x00002b1f8259b182 in start_thread (arg=0x2b1f87ee1700) at 
> pthread_create.c:312
> #5  0x00002b1f828ab47d in clone () at 
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
>
> Thread 3 (Thread 0x2b1f8c81d700 (LWP 63148)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at 
> ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00000000005fef47 in ?? ()
> #2  0x000000000061101b in ?? ()
> #3  0x000000000058415e in ?? ()
> #4  0x0000000000585309 in ?? ()
> #5  0x0000000041806ecd in ?? ()
> #6  0x00002b1f90004990 in ?? ()
> #7  0xffffffffffffffff in ?? ()
> #8  0x7fffffffffffffff in ?? ()
> #9  0x00002b1f82e1b1b0 in ?? ()
> #10 0xffffffffffffffff in ?? ()
> #11 0x00002b1f90004880 in ?? ()
> #12 0x0000000041806e4a in ?? ()
> #13 0x00002b1f8c81c780 in ?? ()
> #14 0x00002b1f8c81c6f0 in ?? ()
> /build/buildd/gdb-7.7.1/gdb/dwarf2-frame.c:692: internal-error: 
> Unknown CFI encountered.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
> Quit this debugging session? (y or n)
>
> (The gbd crash might or might not be part of the problem).
>
> OS is Ubuntu 14.04, with mono from the xamarin repositories:
> # mono --version
> Mono JIT compiler version 4.2.3 (Stable 4.2.3.4/832de4b Wed Mar 16 
> 13:19:08 UTC 2016)
> Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. 
> www.mono-project.com
>     TLS:           __thread
>     SIGSEGV:       altstack
>     Notifications: epoll
>     Architecture:  amd64
>     Disabled:      none
>     Misc:          softdebug
>     LLVM:          supported, not enabled.
>     GC:            sgen
>
> The process is still running if you need further debugging 
> information. The problem does not affect all instance, but about 20%. 
> It is thus cannot be reproduced reliably.
>
> Regards,
> Burkhard
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