[Mono-dev] Mono hangs on shutdown when /dev/ttySx ports were opened.

[Leszek Ciesielski]

Hi,

kill -SIGUSR1 PID prints

User definied signal 1

And Mono terminates. Does this suggest no managed threads were left
(there are 10 or 11 while the application is running)? gdb native
stack trace follows:

0xffffe430 in __kernel_vsyscall ()
(gdb) thread apply all bt

Thread 4 (Thread 0xb7573b90 (LWP 25150)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7ee73f6 in nanosleep () from /lib/libpthread.so.0
#2  0x081a91f8 in collection_thread (unused=0x0) at collection.c:34
#3  0xb7ee01b5 in start_thread () from /lib/libpthread.so.0
#4  0xb7e263be in clone () from /lib/libc.so.6

Thread 3 (Thread 0xb754fb90 (LWP 25151)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7ee5ef5 in sem_wait@@GLIBC_2.1 () from /lib/libpthread.so.0
#2  0x0812eed9 in finalizer_thread (unused=0x0) at gc.c:1058
#3  0x08153188 in start_wrapper (data=0x8305078) at threads.c:623
#4  0x081c5d66 in thread_start_routine (args=0x82faaa4) at threads.c:286
#5  0x081e5aa5 in GC_start_routine (arg=0x26f20) at pthread_support.c:1382
#6  0xb7ee01b5 in start_thread () from /lib/libpthread.so.0
#7  0xb7e263be in clone () from /lib/libc.so.6

Thread 2 (Thread 0xb565ab90 (LWP 25339)):
#0  0xb7efe3da in clock_gettime () from /lib/librt.so.1
#1  0x081d5705 in mono_100ns_ticks () at mono-time.c:107
#2  0xb568bf66 in ?? ()
#3  0xb568bf23 in ?? ()
#4  0xb568af80 in ?? ()
#5  0xb7916ba0 in ?? ()
#6  0x08110f14 in mono_runtime_delegate_invoke (delegate=0x1a6b712,
params=0xb565a2e4, exc=0x0)
    at object.c:2943
#7  0x0815320f in start_wrapper (data=0x0) at threads.c:629
#8  0x081c5d66 in thread_start_routine (args=0x82faff4) at threads.c:286
#9  0x081e5aa5 in GC_start_routine (arg=0x2dffe0) at pthread_support.c:1382
#10 0xb7ee01b5 in start_thread () from /lib/libpthread.so.0
#11 0xb7e263be in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7d206f0 (LWP 25117)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb7ee3c35 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x081af0b1 in _wapi_handle_timedwait_signal_handle (handle=0x400,
timeout=0x0, alertable=1,
    poll=0) at handles.c:1605
#3  0x081af1b7 in _wapi_handle_wait_signal (poll=0) at handles.c:1534
#4  0x081cac2b in WaitForMultipleObjectsEx (numobjects=2,
handles=0x8c0a900, waitall=1,
    timeout=4294967295, alertable=0) at wait.c:723
#5  0x081510b1 in wait_for_tids (wait=0x8c0a900, timeout=365) at threads.c:2443
#6  0x0815488c in mono_thread_manage () at threads.c:2733
#7  0x080b25cd in mono_main (argc=2, argv=0xbfafbdb4) at driver.c:1648
#8  0x0805af21 in main (argc=Cannot access memory at address 0x80
) at main.c:34
#0  0xffffe430 in __kernel_vsyscall ()

Regards,

skolima

On Thu, Sep 17, 2009 at 12:25 PM, Zoltan Varga <vargaz at gmail.com> wrote:
> Hi,
>
>   You can attach to the hung process with gdb and type
> 'thread apply all bt' to get a native backtrace, and/or
> send a SIGUSR1 signal to the process to print a manager backtrace.
>
>                Zoltan
>
> On Thu, Sep 17, 2009 at 12:15 PM, Leszek Ciesielski <skolima at gmail.com>
> wrote:
>>
>> Hi,
>>
>> we have tried to isolate the problem for almost a month, the best we
>> managed to get is a hardware configuration for our application that
>> hangs on every exit - but this is with about 8MB of binaries, probably
>> over 100k SLOC. What I am hoping for now are some gdb guidelines to
>> pinpoint the problem.
>>
>> Regards
>>
>> On Thu, Sep 17, 2009 at 12:02 PM, Zoltan Varga <vargaz at gmail.com> wrote:
>> > Hi,
>> >
>> >   Could you create some kind of test case to help us debug this issue ?
>> >
>> >             Zoltan
>> >
>> > On Thu, Sep 17, 2009 at 11:28 AM, Leszek Ciesielski <skolima at gmail.com>
>> > wrote:
>> >>
>> >> Hi,
>> >>
>> >> I am experiencing Mono hangup when my application should terminate.
>> >> The application opens multiple serial ports, but the bug has also
>> >> manifested when network sockets were hanging on reads or writes - it
>> >> seems to be related to a pending I/O operation, asynchronous
>> >> networking helps somewhat. Anyway, the managed code exits, Mono CPU
>> >> usage jumps to 100%, /proc/PID/status shows 4 threads and the
>> >> application never exits. kill -3 PID prints:
>> >>
>> >> "0" tid=0x0xb7d0f6f0 this=0x0x2fed8 thread handle 0x404 state: waiting
>> >> on 0x400 : Event owns ()
>> >>
>> >> and that's all. What can I do to help debug this?
>> >>
>> >> BTW this happens on 1.9 (Debian and Gentoo) and 2.4.2.3 (Debian and
>> >> OpenSuse) [so I'm pretty sure it's not distribution-specific], more
>> >> often if the application uses System.Windows.Forms.
>> >>
>> >> Regards,
>> >>
>> >> Leszek 'skolima' Ciesielski
>> >> _______________________________________________
>> >> Mono-devel-list mailing list
>> >> Mono-devel-list at lists.ximian.com
>> >> http://lists.ximian.com/mailman/listinfo/mono-devel-list
>> >
>> >
>
>