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([2a02:168:6806:0:ce40:6189:439a:6820]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d082a6bd4sm429000f8f.84.2024.10.02.22.31.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Oct 2024 22:31:26 -0700 (PDT) Message-ID: <1ee5f5828e2021bf1051dc1f9b6f01a8c061ffb1.camel@gmail.com> Subject: Re: [REGRESSION] Re: [PATCH 17/24] sched/fair: Implement delayed dequeue From: Klaus Kudielka To: Chris Bainbridge , Peter Zijlstra Cc: linux-kernel@vger.kernel.org, bsegall@google.com, dietmar.eggemann@arm.com, efault@gmx.de, juri.lelli@redhat.com, kprateek.nayak@amd.com, mgorman@suse.de, mingo@redhat.com, rostedt@goodmis.org, tglx@linutronix.de, vincent.guittot@linaro.org, vschneid@redhat.com, wuyun.abel@bytedance.com, youssefesmat@chromium.org, spasswolf@web.de, regressions@lists.linux.dev Date: Thu, 03 Oct 2024 07:31:26 +0200 In-Reply-To: References: <20240830123458.3557-1-spasswolf@web.de> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.0-1+b1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: > >=20 > > [=C2=A0=C2=A0=C2=A0 T1] smp: Bringing up secondary CPUs ... > > [=C2=A0=C2=A0=C2=A0 T1] smpboot: x86: Booting SMP configuration: > > [=C2=A0=C2=A0=C2=A0 T1] .... node=C2=A0 #0, CPUs:=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 #2=C2=A0 #4=C2=A0 #6=C2=A0 #8 #10 #12 #14=C2=A0 #1 > > This is the line I'm concerend about: > > [=C2=A0=C2=A0=C2=A0 T1] psi: inconsistent task state! task=3D61:cpuhp/3= cpu=3D0 psi_flags=3D4 clear=3D0 set=3D4 > > [=C2=A0=C2=A0=C2=A0 T1]=C2=A0=C2=A0 #3=C2=A0 #5=C2=A0 #7=C2=A0 #9 #11 #= 13 #15 > > [=C2=A0=C2=A0=C2=A0 T1] Spectre V2 : Update user space SMT mitigation: = STIBP always-on > > [=C2=A0=C2=A0=C2=A0 T1] smp: Brought up 1 node, 16 CPUs > > [=C2=A0=C2=A0=C2=A0 T1] smpboot: Total of 16 processors activated (1022= 16.16 BogoMIPS) > >=20 > > I bisected this to commit 152e11f6df29 ("sched/fair: Implement delayed = dequeue"). > > Is this normal or is this something I should worry about? > >=20 > > Bert Karwatzki >=20 > I am also getting a similar error on boot, and bisected it to the same co= mmit: >=20 > [=C2=A0=C2=A0=C2=A0 0.342931] psi: inconsistent task state! task=3D15:rcu= _tasks_trace cpu=3D0 psi_flags=3D4 clear=3D0 set=3D4 >=20 > #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 (Deb= ian 14.2.0-1) 14.2.0, GNU ld (GNU Binutils for Debian) 2.43.1) #1 SMP Thu O= ct 3 06:59:25 CEST 2024 [ 0.000000] CPU: ARMv7 Processor [414fc091] revision 1 (ARMv7), cr=3D10c= 5387d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instr= uction 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=3D2:kthreadd cpu=3D0 psi_= flags=3D4 clear=3D0 set=3D4