Comment 19 for bug 1663528

Created attachment 136388
(gdb) t a a bt; t a a bt f; info registers

Looking through the core dump files of one system with Debian 9 (Stretch), I noticed some of PulseAudio 10.0, where it terminates with SIGABRT.

```
Thread 3 (Thread 0x7f60175f1700 (LWP 9319)):
#0 0x00007f6028922771 in __GI_ppoll (fds=0x56233965ece0, nfds=4, timeout=<optimized out>, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1 0x00007f602a098df8 in ppoll (__ss=0x0, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
#2 pa_rtpoll_run (p=0x56233978bbe0) at pulsecore/rtpoll.c:314
#3 0x00007f6022189a73 in thread_func (userdata=0x56233978b9c0) at modules/alsa/alsa-source.c:1516
#4 0x00007f6029e302c8 in internal_thread_func (userdata=0x56233964bf50) at pulsecore/thread-posix.c:81
#5 0x00007f6029302494 in start_thread (arg=0x7f60175f1700) at pthread_create.c:333
#6 0x00007f602892baff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 2 (Thread 0x7f6017df2700 (LWP 9318)):
#0 0x00007f6028922771 in __GI_ppoll (fds=0x5623396d0b80, nfds=5, timeout=<optimized out>, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1 0x00007f602a098df8 in ppoll (__ss=0x0, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
#2 pa_rtpoll_run (p=0x562339750c60) at pulsecore/rtpoll.c:314
#3 0x00007f6022183575 in thread_func (userdata=0x562339750a10) at modules/alsa/alsa-sink.c:1799
#4 0x00007f6029e302c8 in internal_thread_func (userdata=0x562339668390) at pulsecore/thread-posix.c:81
#5 0x00007f6029302494 in start_thread (arg=0x7f6017df2700) at pthread_create.c:333
#6 0x00007f602892baff in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 1 (Thread 0x7f602a4684c0 (LWP 2624)):
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007f60288773fa in __GI_abort () at abort.c:89
#2 0x00007f602886ee37 in __assert_fail_base (fmt=<optimized out>, assertion=assertion@entry=0x7f60224748e8 "mixer", file=file@entry=0x7f6022474b79 "mixer.c", line=line@entry=929, function=function@entry=0x7f6022474e00 <__PRETTY_FUNCTION__.9666> "snd_mixer_elem_get_callback_private") at assert.c:92
#3 0x00007f602886eee2 in __GI___assert_fail (assertion=assertion@entry=0x7f60224748e8 "mixer", file=file@entry=0x7f6022474b79 "mixer.c", line=line@entry=929, function=function@entry=0x7f6022474e00 <__PRETTY_FUNCTION__.9666> "snd_mixer_elem_get_callback_private") at assert.c:101
#4 0x00007f60223f503d in snd_mixer_elem_get_callback_private (mixer=mixer@entry=0x0) at mixer.c:929
#5 0x00007f60226be60b in report_jack_state (melem=0x0, mask=mask@entry=0) at modules/alsa/module-alsa-card.c:362
#6 0x00007f60226beb1b in card_suspend_changed (c=<optimized out>, card=<optimized out>, u=0x5623395de220) at modules/alsa/module-alsa-card.c:628
#7 0x00007f602a08d60c in pa_hook_fire (hook=0x562339555948, data=data@entry=0x5623395d0a40) at pulsecore/hook-list.c:104
#8 0x00007f602a089d8a in pa_card_suspend (c=c@entry=0x5623395d0a40, suspend=suspend@entry=false, cause=cause@entry=PA_SUSPEND_SESSION) at pulsecore/card.c:390
#9 0x00007f60228c500c in verify_access (u=u@entry=0x5623395be700, d=0x5623395d30d0) at modules/module-udev-detect.c:362
#10 0x00007f60228c63e5 in inotify_cb (a=0x5623395545e8, e=<optimized out>, fd=14, events=<optimized out>, userdata=0x5623395be700) at modules/module-udev-detect.c:624
#11 0x00007f6029ba774c in dispatch_pollfds (m=0x562339554590) at pulse/mainloop.c:655
#12 pa_mainloop_dispatch (m=m@entry=0x562339554590) at pulse/mainloop.c:898
#13 0x00007f6029ba7b4c in pa_mainloop_iterate (m=0x562339554590, block=<optimized out>, retval=0x7ffc8077f948) at pulse/mainloop.c:929
#14 0x00007f6029ba7bf0 in pa_mainloop_run (m=0x562339554590, retval=0x7ffc8077f948) at pulse/mainloop.c:944
#15 0x000056233875bd8c in main (argc=<optimized out>, argv=<optimized out>) at daemon/main.c:1140
```

Please find the full backtraces attached.