linux-kernel - Workqueue regression

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Date: Thu, 1 Feb 2024 21:57:59 +0100
From: Konrad Dybcio <konradybcio@...nel.org>
To: Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
 Naohiro.Aota@....com, kernel-team@...a.com
Cc: Bjorn Andersson <andersson@...nel.org>
Subject: Workqueue regression

Hi,

So, commit "Implement system-wide nr_active enforcement for unbound workqueues"
broke *something* and now performing a suspend-wakeup cycle on a Qualcomm
SC8280XP-based (arm64) platform hangs when performing the resume tasks,
presumably somewhere near PCIe reinitialization (but that may be a red herring).

Reverting the commit (and the ones on top of it due to conflicts) fixes
the issue on next-20240130 and later (plus some out-of-tree patches that
are largely unrelated).

Not sure where to start looking.

Konrad