[alsa-devel] FiiO E10k (Digihub USB Audio), occasional system hang.

[Valni]

First off, I apologize if I'm reporting this bug to the wrong list or in
the wrong manner; I have never done this before.

I've got a Skylake system (kernel 4.3.3-2-ARCH) using Pulseaudio and
ALSA which uses a FiiO E10k Olympus 2 (external DAC/AMP) as  the soundcard.
Very seldom the system will fall to it's knees and ultimately hang,
requiring a hard reboot.
Checking the system logs gives an error and a dump from alsa-util.c,
which is attached to this mail.

I'm unsure if there is anymore info that you would need. If more is
required, please, do ask.
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Jan 14 18:17:10 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: snd_pcm_avail() returned a value that is exceptionally large: 11328 bytes (59 ms).
Jan 14 18:17:10 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers.
Jan 14 18:17:10 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: snd_pcm_dump():
Jan 14 18:17:10 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: Hardware PCM card 0 'DigiHug USB Audio' device 0 subdevice 0
Jan 14 18:17:10 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: Its setup is:
Jan 14 18:17:10 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   stream       : PLAYBACK
Jan 14 18:17:10 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   access       : MMAP_INTERLEAVED
Jan 14 18:17:11 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   format       : S16_LE
Jan 14 18:17:11 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   subformat    : STD
Jan 14 18:17:11 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   channels     : 2
Jan 14 18:17:11 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   rate         : 48000
Jan 14 18:17:11 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   exact rate   : 48000 (48000/1)
Jan 14 18:17:11 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   msbits       : 16
Jan 14 18:17:11 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   buffer_size  : 440
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_size  : 88
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_time  : 1833
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   tstamp_mode  : ENABLE
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   tstamp_type  : MONOTONIC
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_step  : 1
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   avail_min    : 88
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_event : 1
Jan 14 18:17:12 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   start_threshold  : -1
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   stop_threshold   : 7926335344172072960
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   silence_threshold: 0
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   silence_size : 0
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   boundary     : 7926335344172072960
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   appl_ptr     : 309131528
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   hw_ptr       : 309134448
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: snd_pcm_delay() returned a value that is exceptionally large: -14656 bytes (-76 ms).
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers.
Jan 14 18:17:13 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: snd_pcm_dump():
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: Hardware PCM card 0 'DigiHug USB Audio' device 0 subdevice 0
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c: Its setup is:
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   stream       : PLAYBACK
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   access       : MMAP_INTERLEAVED
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   format       : S16_LE
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   subformat    : STD
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   channels     : 2
Jan 14 18:17:14 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   rate         : 48000
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   exact rate   : 48000 (48000/1)
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   msbits       : 16
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   buffer_size  : 440
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_size  : 88
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_time  : 1833
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   tstamp_mode  : ENABLE
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   tstamp_type  : MONOTONIC
Jan 14 18:17:15 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_step  : 1
Jan 14 18:17:16 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   avail_min    : 88
Jan 14 18:17:16 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   period_event : 1
Jan 14 18:17:16 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   start_threshold  : -1
Jan 14 18:17:16 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   stop_threshold   : 7926335344172072960
Jan 14 18:17:16 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   silence_threshold: 0
Jan 14 18:17:16 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   silence_size : 0
Jan 14 18:17:16 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   boundary     : 7926335344172072960
Jan 14 18:17:17 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   appl_ptr     : 309185120
Jan 14 18:17:17 den pulseaudio[6298]: E: [alsa-sink-USB Audio] alsa-util.c:   hw_ptr       : 309191472