linux-kernel - Re: sched: update_entity_lag does not handle corner case with task in PI chain

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Message-ID: <1fa78304-b194-4d34-888a-c387859ef72d@amd.com>
Date: Fri, 24 Oct 2025 09:30:02 +0530
From: K Prateek Nayak <kprateek.nayak@....com>
To: "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
CC: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>, Phil Auld <pauld@...hat.com>, "Valentin
 Schneider" <vschneid@...hat.com>, Steven Rostedt <rostedt@...dmis.org>,
	Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann
	<dietmar.eggemann@....com>, Ben Segall <bsegall@...gle.com>, Mel Gorman
	<mgorman@...e.de>, Shizhao Chen <shichen@...hat.com>,
	<linux-kernel@...r.kernel.org>, Omar Sandoval <osandov@...com>, Xuewen Yan
	<xuewen.yan@...soc.com>
Subject: Re: sched: update_entity_lag does not handle corner case with task in
 PI chain

Hello Luis,

On 10/22/2025 6:05 AM, Luis Claudio R. Goncalves wrote:
>> v6.18 kernels will get rid of this issue as a part of per-task throttle
>> feature and stable should pick up the fix for same on the thread soon. 
> 
> Thank you! You were right, your patch in that thread seems to have fixed
> the issue I reported.
> 
> I read the thread you mentioned, built a test kernel with the patch and have
> been running tests for more than 6h now without a single backtrace. As reported
> earlier, I was able to hit the bug within 15 minutes without the patch.

Thank you for confirming! Greg has picked the patches for both
v6.17 stable and v6.12 stable so the upcoming stable releases and the
RT releases based on them should solve this issues. Thank you again
for testing the fix.

-- 
Thanks and Regards,
Prateek