linux-kernel - WQ_UNBOUND warning since recent workqueue refactoring

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Message-ID: <f7e21caa-e98d-e5b5-932a-fe12d27fde9b@gmail.com>
Date:   Wed, 30 Aug 2023 16:57:42 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: WQ_UNBOUND warning since recent workqueue refactoring

Recently I started to see the following warning on linux-next and presumably
this may be related to the refactoring of the workqueue core code.

[   56.900223] workqueue: output_poll_execute [drm_kms_helper] hogged CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[   56.923226] workqueue: i915_hpd_poll_init_work [i915] hogged CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[   97.860430] workqueue: output_poll_execute [drm_kms_helper] hogged CPU for >10000us 8 times, consider switching to WQ_UNBOUND
[   97.884453] workqueue: i915_hpd_poll_init_work [i915] hogged CPU for >10000us 8 times, consider switching to WQ_UNBOUND

Adding WQ_UNBOUND to these queues didn't change the behavior.
Maybe relevant: I run the affected system headless.