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

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Message-ID: <faa9e4ef-05f5-4db1-8c36-e901e156caea@w6rz.net>
Date: Wed, 22 Jan 2025 03:11:40 -0800
From: Ron Economos <re@...z.net>
To: Peter Zijlstra <peterz@...radead.org>, Arnd Bergmann <arnd@...db.de>
Cc: Naresh Kamboju <naresh.kamboju@...aro.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 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>, 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 1/22/25 02:59, Peter Zijlstra wrote:
> On Wed, Jan 22, 2025 at 11:56:13AM +0100, Arnd Bergmann wrote:
>> 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")
> This one reworks reweight_entity(), but I've been running with that on
> top of 13-rc6 for a week or so and not seen this.

The offending commit is 6d71a9c6160479899ee744d2c6d6602a191deb1f 
"sched/fair: Fix EEVDF entity placement bug causing scheduling lag"

It works fine on 6.13, at least on RISC-V (which is the only arch I test).

It's already been reverted and 6.12.11-rc2 has been pushed out.