linux-kernel - Re: [PATCH][RFC] workqueue: Fix kernel panic on CPU hot-unplug

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Message-ID: <ZcEenNqfJo2lSuNK@slm.duckdns.org>
Date: Mon, 5 Feb 2024 07:45:00 -1000
From: Tejun Heo <tj@...nel.org>
To: Helge Deller <deller@....de>
Cc: Helge Deller <deller@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH][RFC] workqueue: Fix kernel panic on CPU hot-unplug

Hello,

On Mon, Feb 05, 2024 at 10:58:26AM +0100, Helge Deller wrote:
> It seems the commit 0921244f6f4f ("parisc: Only list existing CPUs in cpu_possible_mask")
> is the culprit. Reverting that patch makes cpu hot-unplug work again.
> Furthermore this commit breaks the cpumask Kunit test as reported by Guenter:
> https://lkml.org/lkml/2024/2/4/146
> 
> So, I've added the revert to the parisc git tree and if my further tests
> go well I'll push it upstream.

Yeah, it probably just needs to happen way earlier so that the
cpu_possible_mask doesn't change while the kernel is already half
initialized.

Thanks.

-- 
tejun