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Date:   Tue, 22 Jun 2021 18:47:59 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Oleksandr Natalenko <oleksandr@natalenko.name>
Cc:     stable@vger.kernel.org, Johannes Weiner <hannes@cmpxchg.org>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: Backport d583d360a6 into 5.12 stable
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On Tue, Jun 22, 2021 at 06:30:46PM +0200, Oleksandr Natalenko wrote:
> Hello.
> 
> I'd like to nominate d583d360a6 ("psi: Fix psi state corruption when 
> schedule() races with cgroup move") for 5.12 stable tree.
> 
> Recently, I've hit this:
> 
> ```
> kernel: psi: inconsistent task state! task=2667:clementine cpu=21 psi_flags=0 
> clear=1 set=0
> ```
> 
> and after that PSI IO went crazy high. That seems to match the symptoms 
> described in the commit message.

But this says it fixes 4117cebf1a9f ("psi: Optimize task switch inside
shared cgroups") which did not show up until 5.13-rc1, so how are you
hitting this issue?

Did you try this patch on 5.12.y and see that it solved your problem?

thanks,

greg k-h