From: "Schmid, Carsten" <Carsten_Schmid@mentor.com>
To: Dietmar Eggemann <dietmar.eggemann@arm.com>,
Valentin Schneider <valentin.schneider@arm.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"peterz@infradead.org" <peterz@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: AW: Crash in fair scheduler
Date: Tue, 3 Dec 2019 15:57:00 +0000 [thread overview]
Message-ID: <db86427565354261b1cbb5c2c4e7e2b1@SVR-IES-MBX-03.mgc.mentorg.com> (raw)
In-Reply-To: <f4e810c0-c99a-e78f-a249-9d7efcb37806@arm.com>
> On 03/12/2019 12:09, Valentin Schneider wrote:
> > On 03/12/2019 10:40, Dietmar Eggemann wrote:
> >> On 03/12/2019 11:30, Valentin Schneider wrote:
> >>> On 03/12/2019 09:11, Schmid, Carsten wrote:
> >>
> >> [...]
>
> I can't reproduce it on Arm64 Juno running 4.14.86. I suppose that there
> is no extra reproducer testcase since the issue happened with
> prev->sched_class eq. &idle_sched_class [prev eq. swapper/X 0] in the
> simple path of pick_next_task_fair().
>
> I'm running with CONFIG_SCHED_AUTOGROUP=y and
> CONFIG_FAIR_GROUP_SCHED=y
> some taskgroup related tests for hours now. So the sched_entity (se) can
> be a task, an autogroup or a taskgroup in the simple path. pref is
> either swapper/X or migration/X.
We have the same kernel config settings.
However, as i stated in the analysis, we had
prev->sched_class ne. &fair_sched_class
and, unfortunately, no reproducer.
Looks like we need to find out why rb_leftmost is 0x0/NULL.
next prev parent reply other threads:[~2019-12-03 15:57 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 9:11 Crash in fair scheduler Schmid, Carsten
2019-12-03 10:30 ` Valentin Schneider
2019-12-03 10:40 ` Dietmar Eggemann
2019-12-03 11:09 ` Valentin Schneider
2019-12-03 15:08 ` Dietmar Eggemann
2019-12-03 15:57 ` Schmid, Carsten [this message]
2019-12-03 10:30 ` Peter Zijlstra
2019-12-03 10:51 ` AW: " Schmid, Carsten
2019-12-03 14:01 ` Peter Zijlstra
2019-12-05 10:56 ` AW: " Schmid, Carsten
2019-12-05 17:41 ` Davidlohr Bueso
2019-12-06 10:11 AW: " Schmid, Carsten
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