linux-kernel - Re: nohz fail (was: perf related boot hang.)

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Message-Id: <1408566691-3023-1-git-send-email-iacobcatalin@gmail.com>
Date:	Wed, 20 Aug 2014 22:31:31 +0200
From:	Catalin Iacob <iacobcatalin@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Dave Jones <davej@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Catalin Iacob <iacobcatalin@...il.com>
Subject: Re: nohz fail (was: perf related boot hang.)

I've also just hit what seems to be the same panic in 3.17-rc1 (ignore the 1
local patch, it's an unrelated change in a comment) twice in less than 1
hour. Hitting this twice in a short amount of time seems to be proof that the
3.17 merge window made it trigger more often. Both times I was running a grep
over a Firefox build tree which was taking a long time.

The stacktraces are slightly different but both have the "cancel timer from a
timer, followed by nmi" pattern. Pictures of the 2 stacktraces:
https://drive.google.com/file/d/0B_fRjDygGZSNY0RIc2dyYTExTjg/edit?usp=sharing
https://drive.google.com/file/d/0B_fRjDygGZSNS1pSWFkteURrOTQ/edit?usp=sharing
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