Alsa module blocks when joining thread on destruction. about baresip HOT 9 CLOSED

#
# baresip configuration
#

#------------------------------------------------------------------------------

# Core
poll_method     epoll       # poll, select, epoll ..

# SIP
sip_trans_bsize     128
#sip_listen     0.0.0.0:5060
#sip_certificate    cert.pem

# Audio
audio_player        alsa,default
audio_source        alsa,default
audio_alert     alsa,default
audio_srate     8000-48000
audio_channels      1-2
#ausrc_srate        48000
#auplay_srate       48000
#ausrc_channels     0
#auplay_channels        0

# Video
#video_source       v4l2,/dev/video0
#video_display      x11,nil
video_size      352x288
video_bitrate       500000
video_fps       25

# AVT - Audio/Video Transport
rtp_tos         184
#rtp_ports      10000-20000
#rtp_bandwidth      512-1024 # [kbit/s]
rtcp_enable     no
rtcp_mux        no
jitter_buffer_delay 5-10        # frames
rtp_stats       no

# Network
#dns_server     10.0.0.1:53
#net_interface      wlan0

# BFCP
#bfcp_proto     udp

#------------------------------------------------------------------------------
# Modules

#module_path        /usr/local/lib/baresip/modules

# UI Modules
module          stdio.so
#module         cons.so
#module         evdev.so
#module         httpd.so

# Audio codec Modules (in order)
#module         opus.so
#module         silk.so
#module         amr.so
#module         g7221.so
#module         g722.so
#module         g726.so
module          g711.so
#module         gsm.so
#module         l16.so
#module         speex.so
#module         bv32.so

# Audio filter Modules (in encoding order)
module          vumeter.so
#module         sndfile.so
#module         speex_aec.so
#module         speex_pp.so
#module         plc.so

# Audio driver Modules
module          alsa.so
#module         portaudio.so

# Video codec Modules (in order)
#module         avcodec.so
#module         vpx.so

# Video filter Modules (in encoding order)
#module         selfview.so

# Video source modules
#module         v4l.so
#module         v4l2.so
#module         x11grab.so
#module         cairo.so

# Video display modules
#module         x11.so
#module         sdl2.so

# Audio/Video source modules
#module         rst.so
#module         gst.so

# Media NAT modules
module          stun.so
module          turn.so
module          ice.so
module          natpmp.so

# Media encryption modules
#module         srtp.so
#module         dtls_srtp.so


#------------------------------------------------------------------------------
# Temporary Modules (loaded then unloaded)

module_tmp      uuid.so
module_tmp      account.so


#------------------------------------------------------------------------------
# Application Modules

module_app      auloop.so
module_app      contact.so
module_app      menu.so
#module_app     mwi.so
#module_app     natbd.so
#module_app     presence.so
#module_app     syslog.so
module_app      vidloop.so


#------------------------------------------------------------------------------
# Module parameters


cons_listen     0.0.0.0:5555

http_listen     0.0.0.0:8000

evdev_device        /dev/input/event0

# Speex codec parameters
speex_quality       7 # 0-10
speex_complexity    7 # 0-10
speex_enhancement   0 # 0-1
speex_mode_nb       3 # 1-6
speex_mode_wb       6 # 1-6
speex_vbr       0 # Variable Bit Rate 0-1
speex_vad       0 # Voice Activity Detection 0-1
speex_agc_level     8000

# Opus codec parameters
opus_bitrate        28000 # 6000-510000

# NAT Behavior Discovery
natbd_server        creytiv.com
natbd_interval      600     # in seconds

# Selfview
video_selfview      window # {window,pip}
#selfview_size      64x64

# ICE
ice_turn        no
ice_debug       no
ice_nomination      regular # {regular,aggressive}
ice_mode        full    # {full,lite}

$ pactl list | grep baresip
                application.name = "ALSA plug-in [baresip]"
                application.process.binary = "baresip"
                module-stream-restore.id = "sink-input-by-application-name:ALSA plug-in [baresip]"
                application.name = "ALSA plug-in [baresip]"
                application.process.binary = "baresip"
                module-stream-restore.id = "source-output-by-application-name:ALSA plug-in [baresip]"
                application.name = "ALSA plug-in [baresip]"
                application.process.binary = "baresip"
                application.name = "ALSA plug-in [baresip]"
                application.process.binary = "baresip"

Audio-loop: 8000Hz, 1ch
8000Hz 1ch  n_read=238 n_write=244 rw_ratio=0.97audio-loop stopped

(gdb) bt
#0  0x00007ffff6e664db in pthread_join (threadid=140737122633472, thread_return=0x0) at pthread_join.c:92
#1  0x00007ffff53504b6 in ausrc_destructor (arg=0x671790) at modules/alsa/alsa_src.c:40
#2  0x00007ffff7bbd584 in mem_deref (data=0x671790) at src/mem/mem.c:318
#3  0x00007ffff4441e21 in auloop_destructor (arg=0x660430) at modules/auloop/auloop.c:75
#4  0x00007ffff7bbd584 in mem_deref (data=0x660430) at src/mem/mem.c:318
#5  0x00007ffff4442851 in auloop_stop (pf=0x7ffff5b57550 <pf_stderr>, arg=0x7fffffffdd90) at modules/auloop/auloop.c:349
#6  0x00000000004113c2 in cmd_process (ctxp=0x6299f0 <uictx>, key=65 'A', pf=0x7ffff5b57550 <pf_stderr>) at src/cmd.c:302
#7  0x000000000041bd43 in ui_handler (key=65 'A', pf=0x7ffff5b57550 <pf_stderr>) at src/ui.c:17
#8  0x000000000041be40 in ui_input_key (key=65 'A', pf=0x7ffff5b57550 <pf_stderr>) at src/ui.c:83
#9  0x00007ffff5956d0f in report_key (ui=0x655ae0, key=65 'A') at modules/stdio/stdio.c:66
#10 0x00007ffff5956d9f in ui_fd_handler (flags=1, arg=0x655ae0) at modules/stdio/stdio.c:90
#11 0x00007ffff7bbb53f in fd_handler (re=0x7ffff7ddbcc0 <global_re>, fd=0, flags=1) at src/main/main.c:246
#12 0x00007ffff7bbc4f1 in fd_poll (re=0x7ffff7ddbcc0 <global_re>) at src/main/main.c:849
#13 0x00007ffff7bbc7ee in re_main (signalh=0x41f29b <signal_handler>) at src/main/main.c:992
#14 0x000000000041f54b in main (argc=1, argv=0x7fffffffe1b8) at src/main.c:169

    while (st->run) {
        err = snd_pcm_readi(st->read, st->sampv, num_frames);

-       err = snd_pcm_open(&st->read, st->device, SND_PCM_STREAM_CAPTURE, 0);
+       err = snd_pcm_open(&st->read, st->device, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);

static void ausrc_destructor(void *arg)
{
    struct ausrc_st *st = arg;

    if (st->read)
        snd_pcm_close(st->read);

    /* Wait for termination of other thread */
    if (st->run) {
        st->run = false;
        (void)pthread_join(st->thread, NULL);
    }

    mem_deref(st->sampv);
    mem_deref(st->device);
}