Seems I was mistaken. This happens on 6.8 as well.
** Attachment added: "kern.log"
https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.5/+bug/2061091/+attachment/5773507/+files/kern.log
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Thanks for the update, could you bisect which commit fixes the issue
since upstream 6.8 works?
https://git-scm.com/docs/git-bisect
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Ok, I reproduced this on a rebuild of 6.5.0-34 with
CONFIG_PROVE_LOCKING. Here are some relevant-looking bits of the logs.
It looks like the wireplumber process and the usb_disconnect process
have deadlocked?
[Thinking about this further, possibly the action that triggers it is to
disconnect the
Oddly, I don't seem to be able to reproduce this problem on an upstream
6.8 kernel. I'll try with a rebuild of 6.5.0-27-generic instead.
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> And this call trace looks is related to current issue, I guess
snd_power_ref_and_wait was waiting for snd_card_disconnect which wakes
up power_sleep at the end of the code, but snd_card_disconnect ->
snd_device_disconnect_all -> snd_pcm_dev_disconnect was blocked for some
reason.
Yes,
Looks suspend/resume can be completed sometimes.
Apr 15 12:49:26 xps9320 kernel: [10214.971688] Freezing user space processes
completed (elapsed 0.002 seconds)
Apr 15 21:45:23 xps9320 kernel: [30355.137512] Freezing user space processes
completed (elapsed 0.015 seconds)
Apr 15 23:02:59 xps9320
And this call trace looks is related to current issue, I guess
snd_power_ref_and_wait was waiting for snd_card_disconnect which wakes
up power_sleep at the end of the code, but snd_card_disconnect ->
snd_device_disconnect_all -> snd_pcm_dev_disconnect was blocked for some
reason.
Apr 15 21:48:23
There is another calltrace in kern.log which might be another issue
(probably need a separated bug report).
Apr 15 21:45:23 xps9320 kernel: [43079.109011]
Apr 15 21:45:23 xps9320 kernel: [43079.112281] UBSAN:
Here's the kern.log since the last-but-one reboot.
** Attachment added: "kern.log"
https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-6.5/+bug/2061091/+attachment/5766127/+files/kern.log.gz
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rav@xps9320:~$ cat /proc/asound/modules
0 snd_soc_sof_sdw
1 snd_usb_audio
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https://bugs.launchpad.net/bugs/2061091
Title:
Freezing user space processes
Could you share which audio driver is used in the affected system by
"cat /proc/asound/modules"? And pls attach the full kern.log to check if
something is suspicious here.
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** Changed in: linux-signed-hwe-6.5 (Ubuntu)
Assignee: Anthony Wong (anthonywong) => GuoqingJiang (guoqingjiang)
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https://bugs.launchpad.net/bugs/2061091
** Changed in: linux-signed-hwe-6.5 (Ubuntu)
Assignee: (unassigned) => Anthony Wong (anthonywong)
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https://bugs.launchpad.net/bugs/2061091
Title:
I found a very similar report at
https://discussion.fedoraproject.org/t/freezing-user-space-processes-
failed-after-20-000-seconds-2-tasks-refusing-to-freeze-wq-busy-0/92672,
but no resolution there.
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