I just hit this too:
(gdb) backtrace
#0 0x00f13422 in __kernel_vsyscall ()
#1 0x009ab4d1 in *__GI_raise (sig=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#2 0x009ae932 in *__GI_abort () at abort.c:92
#3 0x00c5ff78 in pa_memblock_unref (b=0xb705d000) at pulsecore/memblock.c:575
#4 0x00c62f1f in drop_block (bq=0xae4a01a8, q=0x94aeda0) at
pulsecore/memblockq.c:207
#5 0x00c64bc8 in drop_backlog (bq=0xae4a01a8, length=19428) at
pulsecore/memblockq.c:222
#6 pa_memblockq_drop (bq=0xae4a01a8, length=19428) at pulsecore/memblockq.c:555
#7 0x00653049 in pa_sink_input_drop (i=0xae49c700, nbytes=19428) at
pulsecore/sink-input.c:733
#8 0x0065d6c4 in inputs_drop (s=<value optimized out>, info=<value optimized
out>, n=1, result=0xb7d5e214) at pulsecore/sink.c:810
#9 0x0065fed1 in pa_sink_render_into (s=0x93d6a90, target=0xb7d5e214) at
pulsecore/sink.c:1039
#10 0x00660b3c in pa_sink_render_into_full (s=0x93d6a90, target=0xb7d5e2b4) at
pulsecore/sink.c:1069
#11 0x003c6428 in mmap_write (userdata=0x93bfd88) at
modules/alsa/alsa-sink.c:601
#12 thread_func (userdata=0x93bfd88) at modules/alsa/alsa-sink.c:1359
#13 0x00c7b872 in internal_thread_func (userdata=0x93e0550) at
pulsecore/thread-posix.c:72
#14 0x0043e80e in start_thread (arg=0xb7d5eb70) at pthread_create.c:300
#15 0x00a4d81e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
pulsecore/memblock.c:575 is:
pa_assert(PA_REFCNT_VALUE(b) > 0);
--
pulseaudio crashed with SIGABRT in __kernel_vsyscall()
https://bugs.launchpad.net/bugs/424880
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