linux-kernel - Re: [BUG] workqueues and printk not playing nice since next-20240130

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Date: Mon, 5 Feb 2024 22:25:15 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Petr Mladek <pmladek@...e.com>
Cc: "Paul E. McKenney" <paulmck@...nel.org>, Tejun Heo <tj@...nel.org>,
	Jonas Oberhauser <jonas.oberhauser@...weicloud.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, rcu@...r.kernel.org
Subject: Re: [BUG] workqueues and printk not playing nice since next-20240130

On (24/02/05 14:07), Petr Mladek wrote:
> > Good point, if it does recur, I could try it on bare metal.
> 
> Please, me, John, and Sergey know if anyone see this again. I do not
> feel comfortable when there is problem which might make consoles calm.

Agreed.

> Bisection identified this commit:
> 5797b1c18919 ("workqueue: Implement system-wide nr_active enforcement for unbound workqueues")

That commit triggered early boot use-after-free (per kasan) on
my system, which probably could derail some things.