linux-kernel - Re: DEBUG_ATOMIC_SLEEP spew in cgroup_task

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Message-ID: <aQtqXfMfy8SWjS67@mozart.vkv.me>
Date: Wed, 5 Nov 2025 07:16:45 -0800
From: Calvin Owens <calvin@...nvd.org>
To: Tejun Heo <tj@...nel.org>
Cc: linux-kernel@...r.kernel.org, Dan Schatzberg <dschatzberg@...a.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: DEBUG_ATOMIC_SLEEP spew in cgroup_task_dead() on next-20251104

On Tuesday 11/04 at 09:30 -1000, Tejun Heo wrote:
> Hello, Calvin! How are you?

Still here. Sorry to appear only with problems not solutions :)

I wonder... how much work would it be to make the debugging
instrumentation throw a splat for this class of problem without actually
having to compile the kernel with PREEMPT_RT?

> On Tue, Nov 04, 2025 at 10:11:14AM -0800, Calvin Owens wrote:
> > I'm guessing this is related to d245698d727a ("cgroup: Defer task cgroup
> > unlink until after the task is done switching out")? Is there any other
> > useful info I can provide?
> 
> Ah, I need to make css_set_lock a raw one. I'll reply with patches.
> 
> Thanks.
> 
> -- 
> tejun