Messages in this thread | | | From | "Schmid, Carsten" <> | Subject | AW: Crash in fair scheduler | Date | Tue, 3 Dec 2019 15:57:00 +0000 |
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> 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.
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