.
Thread 3 (process 6692):
#0  0x00007fc8e9b32421 in ?? () from /lib64/ld-linux-x86-64.so.2
#1  0x00007fc8e9b39332 in ?? () from /lib64/ld-linux-x86-64.so.2
#2  0x00007fc8e62187e6 in ?? () from /usr/lib/libgthread-2.0.so.0
#3  0x0000000000000000 in ?? ()
.
Thread 2 (process 6700):
#0  0x00007fc8e4e70537 in __pthread_mutex_cond_lock ()
   from /lib/libpthread.so.0
#1  0x00007fc8e4e6b374 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#2  0x00007fc8e1ce280b in pa_threaded_mainloop_wait ()
   from /usr/lib/libpulse.so.0
#3  0x00007fc8e1f19302 in pulse_wait_operation ()
   from /usr/lib/alsa-lib/libasound_module_pcm_pulse.so
#4  0x00007fc8e1f18613 in ?? ()
   from /usr/lib/alsa-lib/libasound_module_pcm_pulse.so
#5  0x00007fc8e21ac037 in ?? () from /usr/lib/libasound.so.2
#6  0x00007fc8e216d6f6 in snd_pcm_close () from /usr/lib/libasound.so.2
#7  0x00007fc8e23fe071 in ?? () from /usr/lib/libcanberra/libcanberra-alsa.so
#8  0x00007fc8e23fe631 in ?? () from /usr/lib/libcanberra/libcanberra-alsa.so
#9  0x00007fc8e4e673ea in start_thread () from /lib/libpthread.so.0
#10 0x00007fc8e4bd4b9d in clone () from /lib/libc.so.6
#11 0x0000000000000000 in ?? ()
.
Thread 1 (process 6699):
#0  0x00007fc8e1cfd9f9 in ?? () from /usr/lib/libpulse.so.0
#1  0x00007fc8e1cf7410 in ?? () from /usr/lib/libpulse.so.0
#2  0x00007fc8e1cf5f53 in ?? () from /usr/lib/libpulse.so.0
#3  0x00007fc8e1cd866d in pa_mainloop_dispatch () from /usr/lib/libpulse.so.0
#4  0x00007fc8e1cd88f6 in pa_mainloop_iterate () from /usr/lib/libpulse.so.0
#5  0x00007fc8e1cd89b0 in pa_mainloop_run () from /usr/lib/libpulse.so.0
#6  0x00007fc8e1ce2d6d in ?? () from /usr/lib/libpulse.so.0
#7  0x00007fc8e1cff400 in ?? () from /usr/lib/libpulse.so.0
#8  0x00007fc8e4e673ea in start_thread () from /lib/libpthread.so.0
#9  0x00007fc8e4bd4b9d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()