linux-kernel - Re: [REGRESSION] Re: [PATCH 17/24] sched/fair: Implement delayed dequeue

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Message-ID: <9adb9245-612e-4bd9-b4bc-7eb3ec42624c@leemhuis.info>
Date: Sun, 22 Sep 2024 18:01:29 +0200
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Chris Bainbridge <chris.bainbridge@...il.com>,
 Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, bsegall@...gle.com,
 dietmar.eggemann@....com, efault@....de, juri.lelli@...hat.com,
 kprateek.nayak@....com, mgorman@...e.de, mingo@...hat.com,
 rostedt@...dmis.org, tglx@...utronix.de, vincent.guittot@...aro.org,
 vschneid@...hat.com, wuyun.abel@...edance.com, youssefesmat@...omium.org,
 spasswolf@....de, regressions@...ts.linux.dev,
 Johannes Weiner <hannes@...xchg.org>
Subject: Re: [REGRESSION] Re: [PATCH 17/24] sched/fair: Implement delayed
 dequeue

On 22.09.24 17:45, Chris Bainbridge wrote:
> On Fri, Aug 30, 2024 at 02:34:56PM +0200, Bert Karwatzki wrote:
>> Since linux next-20240820 the following messages appears when booting:
>>
>> [    T1] smp: Bringing up secondary CPUs ...
>> [    T1] smpboot: x86: Booting SMP configuration:
>> [    T1] .... node  #0, CPUs:        #2  #4  #6  #8 #10 #12 #14  #1
>> This is the line I'm concerend about:
>> [    T1] psi: inconsistent task state! task=61:cpuhp/3 cpu=0 psi_flags=4 clear=0 set=4
>> [    T1]   #3  #5  #7  #9 #11 #13 #15
>> [    T1] Spectre V2 : Update user space SMT mitigation: STIBP always-on
>> [    T1] smp: Brought up 1 node, 16 CPUs
>> [    T1] smpboot: Total of 16 processors activated (102216.16 BogoMIPS)
>>
>> I bisected this to commit 152e11f6df29 ("sched/fair: Implement delayed dequeue").
>> Is this normal or is this something I should worry about?
>>
> I am also getting a similar error on boot, and bisected it to the same commit:
> 
> [    0.342931] psi: inconsistent task state! task=15:rcu_tasks_trace cpu=0 psi_flags=4 clear=0 set=4
> 
> #regzbot introduced: 152e11f6df293e816a6a37c69757033cdc72667d

thx for CCing the regressions list.

Paul also reported this earlier today:

https://lore.kernel.org/all/cd67fbcd-d659-4822-bb90-7e8fbb40a856@molgen.mpg.de/

Hannes [CCed] replied there and has some idea what might be wrong:

https://lore.kernel.org/all/20240922102047.GA437832@cmpxchg.org/

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

P.S.:

#regzbot dup:
https://lore.kernel.org/all/cd67fbcd-d659-4822-bb90-7e8fbb40a856@molgen.mpg.de/

#regzbot report:
https://lore.kernel.org/all/cd67fbcd-d659-4822-bb90-7e8fbb40a856@molgen.mpg.de/
#regzbot introduced: 152e11f6df293e816a6a37c69757033cdc72667d