linux-kernel - Re: [PATCH] sched: Fix yet more sched

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Date:   Thu, 17 Feb 2022 11:50:31 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Borislav Petkov <bp@...e.de>,
        Tadeusz Struk <tadeusz.struk@...aro.org>,
        x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        zhangqiao22@...wei.com, tj@...nel.org
Subject: Re: [PATCH] sched: Fix yet more sched_fork() races

On 17/02/2022 09:51, Peter Zijlstra wrote:
> On Mon, Feb 14, 2022 at 10:16:57AM +0100, Peter Zijlstra wrote:
>> Zhang, Tadeusz, TJ, how does this look?
> 
> *sigh* I was hoping for some Tested-by, since I've no idea how to
> operate this cgroup stuff properly.

At least the reproducer from
https://syzkaller.appspot.com/bug?id=9d9c27adc674e3a7932b22b61c79a02da82cbdc1
doesn't barf with this patch but it does on 5.17-rc2 on Arm64 Juno-r0.

sched: Fix yet more sched_fork() races (2022-02-17 Peter Zijlstra)
13765de8148f - sched/fair: Fix fault in reweight_entity (2022-02-06
Tadeusz Struk)
26291c54e111 - Linux 5.17-rc2 (2022-01-30 Linus Torvalds)

Tested-by: Dietmar Eggemann <dietmar.eggemann@....com>

[...]