linux-kernel - Linux 5.10.5 hung task

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Date:   Thu, 7 Jan 2021 22:35:41 +0100
From:   Udo Steinberg <udo@...ervisor.org>
To:     LKML <linux-kernel@...r.kernel.org>
Subject: Linux 5.10.5 hung task

Hi all,

(Please CC: me as I'm not subscribed to LKML)

I'm getting frequent hangs under X11 with Linux 5.10.5 on a Lenovo X1 Carbon
6th Gen laptop with Intel KBL graphics.

Below is a trace of what hangs.

Any pointers for how to debug this further or any patches are appreciated.

Thanks,
Udo

[ 2602.016651] INFO: task kworker/3:1H:373 blocked for more than 20 seconds.
[ 2602.016653]       Not tainted 5.10.5 #1
[ 2602.016653] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2602.016654] task:kworker/3:1H    state:D stack:    0 pid:  373 ppid:     2 flags:0x00004000
[ 2602.016659] Workqueue: events_highpri intel_atomic_cleanup_work
[ 2602.016660] Call Trace:
[ 2602.016663]  __schedule+0x1d7/0x520
[ 2602.016665]  schedule+0x40/0xe0
[ 2602.016666]  schedule_preempt_disabled+0xf/0x20
[ 2602.016667]  __ww_mutex_lock.constprop.0+0x4a3/0x830
[ 2602.016668]  ? acpi_idle_do_entry+0x50/0x50
[ 2602.016669]  intel_unpin_fb_vma+0x20/0xa0
[ 2602.016672]  drm_atomic_helper_cleanup_planes+0x4a/0x60
[ 2602.016673]  intel_atomic_cleanup_work+0x54/0x100
[ 2602.016675]  process_one_work+0x1a8/0x2f0
[ 2602.016676]  ? rescuer_thread+0x410/0x410
[ 2602.016677]  worker_thread+0x48/0x3d0
[ 2602.016678]  ? rescuer_thread+0x410/0x410
[ 2602.016679]  kthread+0x136/0x160
[ 2602.016681]  ? __kthread_bind_mask+0x60/0x60
[ 2602.016682]  ret_from_fork+0x1f/0x30
[ 2622.496742] INFO: task kworker/3:1H:373 blocked for more than 40 seconds.
[ 2622.496744]       Not tainted 5.10.5 #1
[ 2622.496744] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 2622.496745] task:kworker/3:1H    state:D stack:    0 pid:  373 ppid:     2 flags:0x00004000
[ 2622.496750] Workqueue: events_highpri intel_atomic_cleanup_work
[ 2622.496751] Call Trace:
[ 2622.496754]  __schedule+0x1d7/0x520
[ 2622.496756]  schedule+0x40/0xe0
[ 2622.496757]  schedule_preempt_disabled+0xf/0x20
[ 2622.496758]  __ww_mutex_lock.constprop.0+0x4a3/0x830
[ 2622.496759]  ? acpi_idle_do_entry+0x50/0x50
[ 2622.496760]  intel_unpin_fb_vma+0x20/0xa0
[ 2622.496763]  drm_atomic_helper_cleanup_planes+0x4a/0x60
[ 2622.496764]  intel_atomic_cleanup_work+0x54/0x100
[ 2622.496766]  process_one_work+0x1a8/0x2f0
[ 2622.496767]  ? rescuer_thread+0x410/0x410
[ 2622.496768]  worker_thread+0x48/0x3d0
[ 2622.496769]  ? rescuer_thread+0x410/0x410
[ 2622.496771]  kthread+0x136/0x160
[ 2622.496772]  ? __kthread_bind_mask+0x60/0x60
[ 2622.496773]  ret_from_fork+0x1f/0x30