linux-kernel - Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue

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Message-ID: <627e37090198cee91bf79c41b1cd8c20c2e2d71f.camel@gmx.de>
Date: Fri, 13 Sep 2024 18:39:30 +0200
From: Mike Galbraith <efault@....de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Luis Machado <luis.machado@....com>, Dietmar Eggemann
 <dietmar.eggemann@....com>, Vincent Guittot <vincent.guittot@...aro.org>, 
 Hongyan Xia <hongyan.xia2@....com>, mingo@...hat.com,
 juri.lelli@...hat.com, rostedt@...dmis.org,  bsegall@...gle.com,
 mgorman@...e.de, vschneid@...hat.com,  linux-kernel@...r.kernel.org,
 kprateek.nayak@....com, wuyun.abel@...edance.com, 
 youssefesmat@...omium.org, tglx@...utronix.de
Subject: Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue

On Thu, 2024-09-12 at 16:00 +0200, Mike Galbraith wrote:
>
> Oho, I just hit a pick_eevdf() returns NULL in pick_next_entity() and
> we deref it bug in tip that I recall having seen someone else mention
> them having hit.  LTP was chugging away doing lord knows what when
> evolution apparently decided to check accounts, which didn't go well.

BTW, what LTP was up to was cfs_bandwidth01.  I reproduced the crash
using it on master with the full patch set pretty quickly, but rebased
tip 4c293d0fa315 (sans sched/eevdf: More PELT vs DELAYED_DEQUEUE) seems
to be stable.

	-Mike