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From:   "Schmid, Carsten" <Carsten_Schmid@mentor.com>
To:     "mingo@redhat.com" <mingo@redhat.com>,
        "peterz@infradead.org" <peterz@infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Crash in fair scheduler
Thread-Topic: Crash in fair scheduler
Thread-Index: AQHVqbfg64Wqju89WkedWbWijDxswA==
Date:   Tue, 3 Dec 2019 09:11:14 +0000
Message-ID: <1575364273836.74450@mentor.com>
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--_002_157536427383674450mentorcom_
Content-Type: text/plain; charset="iso-8859-1"
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Hi maintainers of the fair scheduler,=0A=
=0A=
we had a crash in the fair scheduler and analysis shows that this could hap=
pen again.=0A=
Happened on 4.14.86 (LTS series) but failing code path still exists in 5.4-=
rc2 (and 4.14.147 too).=0A=
=0A=
I have collected relevant data from the core dump and put together with the=
 source.=0A=
So i was able to explain why the crash happened, but as i am not an expert =
on this=0A=
scheduler stuff i can't tell if any of the data fed into the code path is o=
k or not.=0A=
=0A=
In the analysis appended you can find the details; please check if we ran i=
nto a corner=0A=
case that nobody expected yet or if the data is somehow corrupted (i really=
 can't tell, for me it looks fine).=0A=
Can you please check if this is a bug in the scheduler?=0A=
=0A=
To give some "surrounding" info:=0A=
It looks like a task has slept for a long time, even through some suspend/r=
esume cycles.=0A=
When this task had to wake up, the failure occured.=0A=
=0A=
If you need more data from the core dump, let me know.=0A=
=0A=
Best regards=0A=
Carsten=

--_002_157536427383674450mentorcom_
Content-Type: text/plain; name="fair_scheduler_crash.txt"
Content-Description: fair_scheduler_crash.txt
Content-Disposition: attachment; filename="fair_scheduler_crash.txt";
	size=11368; creation-date="Tue, 03 Dec 2019 09:06:35 GMT";
	modification-date="Tue, 03 Dec 2019 09:06:35 GMT"
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