Description of problem: Using alsa->pulse I have triggered something that looks like BZ #534130 again. An application pjsua from https://github.com/pjsip/pjproject compiled to use alsa hangs when closing the capture device alsa->pulse in poll() inside snd1_pcm_wait_nocheck(). pjsua used to work under Fedora 27. The same issue occurs if using the binary compiled on F27 and recompiling under Fedora 28. Version-Release number of selected component (if applicable): alsa-lib-1.1.6-2.fc28.x86_64 alsa-plugins-pulseaudio-1.1.6-3.fc28.x86_64 How reproducible: Always Steps to Reproduce: 1. Build pjsua on F27/F28 with alsa sound driver 2. Run pjsua, make a call, and try to exit gracefully 3. Actual results: Hang (gdb) bt #0 0x00007ff0f0cba929 in poll () at /lib64/libc.so.6 #1 0x00007ff0f164e293 in snd1_pcm_wait_nocheck () at /lib64/libasound.so.2 #2 0x00007ff0f1698274 in snd_pcm_ioplug_drain () at /lib64/libasound.so.2 #3 0x00007ff0f457a868 in ca_thread_func (arg=0x15236a8) at ../src/pjmedia-audiodev/alsa_dev.c:596 #4 0x00007ff0f2c1dca9 in thread_main (param=0x15367c0) at ../src/pj/os_core_unix.c:541 #5 0x00007ff0f1902564 in start_thread () at /lib64/libpthread.so.0 #6 0x00007ff0f0cc531f in clone () at /lib64/libc.so.6 Expected results: App exits gracefully Additional info: Works fine with native Alsa devices, i.e., blacklist device from pulse in pavucontrol At the hanging point the app is trying to close a capture device; the thread function that blocks looks like static int ca_thread_func (void *arg) { struct alsa_stream* stream = (struct alsa_stream*) arg; snd_pcm_t* pcm = stream->ca_pcm; int size = stream->ca_buf_size; snd_pcm_uframes_t nframes = stream->ca_frames; void* user_data = stream->user_data; char* buf = stream->ca_buf; pj_timestamp tstamp; int result; struct sched_param param; pthread_t* thid; thid = (pthread_t*) pj_thread_get_os_handle (pj_thread_this()); param.sched_priority = sched_get_priority_max (SCHED_RR); PJ_LOG (5,(THIS_FILE, "ca_thread_func(%u): Set thread priority " "for audio capture thread.", (unsigned)syscall(SYS_gettid))); result = pthread_setschedparam (*thid, SCHED_RR, ¶m); if (result) { if (result == EPERM) PJ_LOG (5,(THIS_FILE, "Unable to increase thread priority, " "root access needed.")); else PJ_LOG (5,(THIS_FILE, "Unable to increase thread priority, " "error: %d", result)); } pj_bzero (buf, size); tstamp.u64 = 0; TRACE_((THIS_FILE, "ca_thread_func(%u): Started", (unsigned)syscall(SYS_gettid))); snd_pcm_prepare (pcm); TRACE_((THIS_FILE, "ca_thread_func(%u): Started", (unsigned)syscall(SYS_gettid))); snd_pcm_prepare (pcm); while (!stream->quit) { pjmedia_frame frame; pj_bzero (buf, size); result = snd_pcm_readi (pcm, buf, nframes); if (result == -EPIPE) { PJ_LOG (4,(THIS_FILE, "ca_thread_func: overrun!")); snd_pcm_prepare (pcm); continue; } else if (result < 0) { PJ_LOG (4,(THIS_FILE, "ca_thread_func: error reading data!")); } if (stream->quit) break; frame.type = PJMEDIA_FRAME_TYPE_AUDIO; frame.buf = (void*) buf; frame.size = size; frame.timestamp.u64 = tstamp.u64; frame.bit_info = 0; result = stream->ca_cb (user_data, &frame); if (result != PJ_SUCCESS || stream->quit) break; tstamp.u64 += nframes; } snd_pcm_drain (pcm); TRACE_((THIS_FILE, "ca_thread_func: Stopped")); return PJ_SUCCESS; } The hang seems to be in snd_pcm_drain(pcm)
F28 versions: portaudio-19-27.fc28.x86_64 alsa-plugins-pulseaudio-1.1.6-3.fc28.x86_64 Reverting shared objects to those of F27 portaudio-19-26.fc27.x86_64 /usr/lib64/pulse-11.1/modules: libalsa-util.so module-alsa-card.so module-alsa-sink.so module-alsa-source.so alsa-plugins-pulseaudio-1.1.5-1.fc27.x86_64 /usr/lib64/alsa-lib/: libasound_module_conf_pulse.so libasound_module_ctl_pulse.so libasound_module_pcm_pulse.so makes the application work again.
False positive alas. Further testing with the Fedora 27 binaries also exhibit the same problem.
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Fedora 28 changed to end-of-life (EOL) status on 2019-05-28. Fedora 28 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.