linux-kernel - Re: [PATCH 6.12 000/122] 6.12.11-rc1 review

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Message-Id: <cc947edf-bece-498c-bcb0-5bc403141257@app.fastmail.com>
Date: Wed, 22 Jan 2025 11:56:13 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc: stable@...r.kernel.org, patches@...ts.linux.dev,
 linux-kernel@...r.kernel.org,
 "Linus Torvalds" <torvalds@...ux-foundation.org>,
 "Andrew Morton" <akpm@...ux-foundation.org>,
 "Guenter Roeck" <linux@...ck-us.net>, shuah <shuah@...nel.org>,
 patches@...nelci.org, lkft-triage@...ts.linaro.org,
 "Pavel Machek" <pavel@...x.de>, "Jon Hunter" <jonathanh@...dia.com>,
 "Florian Fainelli" <f.fainelli@...il.com>,
 "Sudip Mukherjee" <sudipm.mukherjee@...il.com>, srw@...dewatkins.net,
 rwarsow@....de, "Conor Dooley" <conor@...nel.org>, hargar@...rosoft.com,
 "Mark Brown" <broonie@...nel.org>, "Peter Zijlstra" <peterz@...radead.org>,
 "Anders Roxell" <anders.roxell@...aro.org>,
 "Vincent Guittot" <vincent.guittot@...aro.org>,
 "Dan Carpenter" <dan.carpenter@...aro.org>
Subject: Re: [PATCH 6.12 000/122] 6.12.11-rc1 review

On Wed, Jan 22, 2025, at 11:04, Naresh Kamboju wrote:
> On Tue, 21 Jan 2025 at 23:28, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:

> 0000000000000000
> <4>[  160.712071] Call trace:
> <4>[ 160.712597] place_entity (kernel/sched/fair.c:5250 (discriminator 1))
> <4>[ 160.713221] reweight_entity (kernel/sched/fair.c:3813)
> <4>[ 160.713802] update_cfs_group (kernel/sched/fair.c:3975 (discriminator 1))
> <4>[ 160.714277] dequeue_entities (kernel/sched/fair.c:7091)
> <4>[ 160.714903] dequeue_task_fair (kernel/sched/fair.c:7144 (discriminator 1))
> <4>[ 160.716502] move_queued_task.isra.0 (kernel/sched/core.c:2437
> (discriminator 1))

I don't see anything that immediately sticks out as causing this,
but I do see five scheduler patches backported in stable-rc
on top of v6.12.8, these are the original commits:

66951e4860d3 ("sched/fair: Fix update_cfs_group() vs DELAY_DEQUEUE")
30dd3b13f9de ("sched_ext: keep running prev when prev->scx.slice != 0")
a2a3374c47c4 ("sched_ext: idle: Refresh idle masks during idle-to-idle transitions")
68e449d849fd ("sched_ext: switch class when preempted by higher priority scheduler")
6268d5bc1035 ("sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()")

      Arnd