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

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Message-ID: <08baa5cd-943b-47cc-832d-1cf6520bef1b@paulmck-laptop>
Date: Mon, 5 Feb 2024 13:17:17 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Tejun Heo <tj@...nel.org>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>,
	Petr Mladek <pmladek@...e.com>,
	Jonas Oberhauser <jonas.oberhauser@...weicloud.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	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 Mon, Feb 05, 2024 at 10:30:25AM -1000, Tejun Heo wrote:
> Hello,
> 
> On Mon, Feb 05, 2024 at 11:41:10AM -0800, Paul E. McKenney wrote:
> > [    0.316453] ==================================================================
> > [    0.317646] BUG: KASAN: use-after-free in wq_update_node_max_active+0x123/0x810
> > [    0.318851] Read of size 8 at addr ffff88802109d788 by task swapper/0/0
> 
> Ah, that one is fixed by 15930da42f89 ("workqueue: Don't call
> cpumask_test_cpu() with -1 CPU in wq_update_node_max_active()"). I have a
> hard time imagining that having anything to do with console being quiet tho.
> It's a cpumask bit test targeting cpu -1 and the result gets overwritten
> later during boot.

Thank you for confirming!

If the silent console comes up again, I will beat up on that more.

							Thanx, Paul