Re: Crashes in perf_event_ctx_lock_nested

Don Zickus
2017-10-31T20:23:52Z

> > Is Chrome OS, changing the default timeout from 10s to something else?
> > That would explain it as a script is executed late in the boot cycle and
> > explain the quick restart.
> >
>
> Correct, Chrome OS changes the timeout from 10 to 5 seconds.
>
> A little experiment suggests that the problem can be triggered by updating
> /proc/sys/kernel/watchdog_thresh. hardlockup_detector_perf_enable() is
> called while hardlockup_detector_perf_cleanup() is running.

Ok, that makes sense then. Though I thought I tested that before acking it.
I will try to duplicate that on my end and see if various solutions could
work.

Cheers,
Don