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

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Message-ID: <1ee5f5828e2021bf1051dc1f9b6f01a8c061ffb1.camel@gmail.com>
Date: Thu, 03 Oct 2024 07:31:26 +0200
From: Klaus Kudielka <klaus.kudielka@...il.com>
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
Subject: Re: [REGRESSION] Re: [PATCH 17/24] sched/fair: Implement delayed
 dequeue

On Sun, 2024-09-22 at 16:45 +0100, 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?
> > 
> > Bert Karwatzki
> 
> 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

Just another data point, while booting 6.12-rc1 on a Turris Omnia:

[    0.000000] Linux version 6.12.0-rc1 (XXX) (arm-linux-gnueabihf-gcc (Debian 14.2.0-1) 14.2.0, GNU ld (GNU Binutils for Debian) 2.43.1) #1 SMP Thu Oct  3 06:59:25 CEST 2024
[    0.000000] CPU: ARMv7 Processor [414fc091] revision 1 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: Turris Omnia
...
[    0.000867] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.000876] psi: inconsistent task state! task=2:kthreadd cpu=0 psi_flags=4 clear=0 set=4