Mackie Onyx 1640i: Long run playback results in xrun and hang.

[AreYouLoco?]

Hi,

I am using custom build real-time kernel 5.12.2-rt3-fw. JACK with ALSA 
backend on Mackie Onyx 1640i.
Lenovo Thinkpad T420 with FireWire. Debian Bullseye (11.0 - stable) 
JACKD version 1.9.17.
I am using 512 samples 3 periods @48kHz.

The problem is that long run playback only around 1h (but the time 
differs), result in
XRUN detected by JACK logs and the whole audio stops. So I have to 
restart JACK in order to make it work.
DMESG is silent about that issue. But sometimes I get:

snd_oxfw fw1.0: Detect discontinuity of CIP: E8 00
And different hex values there.

Here is interesting part from the log:

Sun Sep 12 22:10:12 2021: Jack: JackRequest::Notification
Sun Sep 12 22:10:12 2021: Jack: **** alsa_pcm: xrun of at least 0.027 msecs
Sun Sep 12 22:10:12 2021: Jack: Repreparing capture
Sun Sep 12 22:10:12 2021: Jack: Repreparing playback
Sun Sep 12 22:10:12 2021: Jack: ALSA XRun wait_status = 0
Sun Sep 12 22:10:12 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 22:10:12 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 22:10:12 2021: Jack: JackClient::ClientNotify ref = 2 name = 
dbusapi notify = 3
Sun Sep 12 22:10:12 2021: Jack: JackClient::kXRunCallback
Sun Sep 12 22:10:12 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 22:10:12 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 22:10:12 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 22:10:12 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 22:10:28 2021: ERROR: ALSA: poll time out, polled for 
15998655 usecs, Retrying with a recovery, retry cnt = 1
Sun Sep 12 22:10:44 2021: ERROR: ALSA: poll time out, polled for 
15998654 usecs, Retrying with a recovery, retry cnt = 2
Sun Sep 12 22:11:00 2021: ERROR: ALSA: poll time out, polled for 
15998659 usecs, Retrying with a recovery, retry cnt = 3
Sun Sep 12 22:11:16 2021: ERROR: ALSA: poll time out, polled for 
15998649 usecs, Retrying with a recovery, retry cnt = 4

Anyone have idea what might be the cause of this XRUN? Or how to debug that?

Its reproducible on my setup. Another log catched the same issue:

Sun Sep 12 16:50:44 2021: Jack: **** alsa_pcm: xrun of at least 0.030 msecs
Sun Sep 12 16:50:44 2021: Jack: Repreparing capture
Sun Sep 12 16:50:44 2021: Jack: Repreparing playback
Sun Sep 12 16:50:44 2021: Jack: ALSA XRun wait_status = 0
Sun Sep 12 16:50:44 2021: Jack: JackRequest::Notification
Sun Sep 12 16:50:44 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 16:50:44 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 16:50:44 2021: Jack: JackClient::ClientNotify ref = 2 name = 
dbusapi notify = 3
Sun Sep 12 16:50:44 2021: Jack: JackClient::kXRunCallback
Sun Sep 12 16:50:44 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 16:50:44 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 16:50:44 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 16:50:44 2021: Jack: JackEngine::ClientNotify: no callback 
for notification = 3
Sun Sep 12 16:51:00 2021: ERROR: ALSA: poll time out, polled for 
15998366 usecs, Retrying with a recovery, retry cnt = 1
Sun Sep 12 16:51:16 2021: ERROR: ALSA: poll time out, polled for 
15998353 usecs, Retrying with a recovery, retry cnt = 2
Sun Sep 12 16:51:32 2021: ERROR: ALSA: poll time out, polled for 
15998352 usecs, Retrying with a recovery, retry cnt = 3
Sun Sep 12 16:51:48 2021: ERROR: ALSA: poll time out, polled for 
15998367 usecs, Retrying with a recovery, retry cnt = 4
Sun Sep 12 16:52:04 2021: ERROR: ALSA: poll time out, polled for 
15998353 usecs, Retrying with a recovery, retry cnt = 5
Sun Sep 12 16:52:20 2021: ERROR: ALSA: poll time out, polled for 
15998371 usecs, Reached max retry cnt = 5, Exiting
Sun Sep 12 16:52:20 2021: ERROR: JackAudioDriver::ProcessAsync: read 
error, stopping...
Sun Sep 12 16:52:20 2021: Jack: JackPosixThread::ThreadHandler : exit

I am willing to provide additional info.

Thank you in advance,

AreYouLoco?