Comment 2 for bug 849990

StacktraceTop:
 inMixerShort1 (buffer=0x7f67e0438f88, ipt=0x7f67d0a8e000, nsamp=32, N=<optimized out>) at AudioInput.cpp:250
 AudioInput::addMic (this=0x188efc0, data=0x7f67d0a8e000, nsamp=32) at AudioInput.cpp:373
 PulseAudioSystem::read_callback (s=0x7f67e001e2f0, bytes=<optimized out>, userdata=0x13957c0) at PulseAudio.cpp:449
 pstream_memblock_callback (p=<optimized out>, channel=<optimized out>, offset=0, seek=PA_SEEK_RELATIVE, chunk=0x7f67da8fac50, userdata=0x137d320) at pulse/context.c:365
 do_read (p=0x138ef70) at pulsecore/pstream.c:844