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

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Date:	Thu, 4 Sep 2014 22:17:55 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Catalin Iacob <iacobcatalin@...il.com>
Cc:	Dave Jones <davej@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: nohz fail (was: perf related boot hang.)

On Thu, Sep 04, 2014 at 10:07:37PM +0200, Catalin Iacob wrote:
> On Tue, Sep 2, 2014 at 8:23 PM, Catalin Iacob <iacobcatalin@...il.com> wrote:
> > On Mon, Sep 1, 2014 at 10:14 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> >> I'll send "nohz: Restore NMI safe local irq work for local nohz kick"
> >> as a fix for 3.17 and the rest will have to wait for 3.18 as it's a complicated
> >> fix for a long standing bug.
> >
> > I've been running with the full series since you sent it and haven't
> > experienced the bug since. I'll try to test with just the 3.17 patch
> > to also check that it's enough on its own.
> 
> I tested with just "nohz: Restore NMI safe local irq work for local
> nohz kick" on top of 7505ceaf8635 (which is 3.17-rc3 plus the merge of
> 1 commit) and unfortunately it doesn't fix the issue. I got the same
> panic after some minutes of building Firefox.

Yeah, that's expected. You need to apply the nine patches on top of -rc1:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
        nohz/fixes

"nohz: Restore NMI safe local irq work for local nohz kick" only fixes
part of the issue.

Thanks.
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