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From: Don Zickus <dzickus@redhat.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>
Subject: Re: Crashes in perf_event_ctx_lock_nested
Date: Tue, 31 Oct 2017 16:23:50 -0400	[thread overview]
Message-ID: <20171031202350.lvmoyup56rlkmjqq@redhat.com> (raw)
In-Reply-To: <20171031201208.GA23413@roeck-us.net>

> > 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

  reply	other threads:[~2017-10-31 20:23 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-30 22:45 Crashes in perf_event_ctx_lock_nested Guenter Roeck
2017-10-31 13:48 ` Peter Zijlstra
2017-10-31 17:16   ` Guenter Roeck
2017-10-31 18:50     ` Don Zickus
2017-10-31 20:12       ` Guenter Roeck
2017-10-31 20:23         ` Don Zickus [this message]
2017-10-31 21:32   ` Thomas Gleixner
2017-10-31 22:11     ` Guenter Roeck
2017-11-01 18:11       ` Don Zickus
2017-11-01 18:34         ` Guenter Roeck
2017-11-01 19:46         ` [tip:core/urgent] watchdog/hardlockup/perf: Use atomics to track in-use cpu counter tip-bot for Don Zickus
2017-11-01 20:28         ` tip-bot for Don Zickus
2017-11-01 18:22       ` Crashes in perf_event_ctx_lock_nested Thomas Gleixner
2017-11-01  8:14     ` Peter Zijlstra
2017-11-01  8:26       ` Thomas Gleixner
2017-11-01 19:46     ` [tip:core/urgent] watchdog/harclockup/perf: Revert a33d44843d45 ("watchdog/hardlockup/perf: Simplify deferred event destroy") tip-bot for Thomas Gleixner
2017-11-01 20:32       ` Guenter Roeck
2017-11-01 20:52         ` Thomas Gleixner
2017-11-01 20:27     ` tip-bot for Thomas Gleixner
2017-10-31 18:48 ` Crashes in perf_event_ctx_lock_nested Don Zickus

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