linux-kernel - Re: Crashes in perf_event_ctx_lock

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Message-ID: <20171031202350.lvmoyup56rlkmjqq@redhat.com>
Date:   Tue, 31 Oct 2017 16:23:50 -0400
From:   Don Zickus <dzickus@...hat.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: Crashes in perf_event_ctx_lock_nested

> > 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