linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141126051131.GA21318@redhat.com>
Date:	Wed, 26 Nov 2014 00:11:31 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jürgen Groß <jgross@...e.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Tue, Nov 25, 2014 at 09:09:45PM -0800, Linus Torvalds wrote:
 > On Nov 25, 2014 8:39 PM, "Jürgen Groß" <jgross@...e.com> wrote:
 > >
 > > I COULD trigger it with 3.17. Took much longer, but I've seen it once.
 > > And from Xen hypervisor data it was clear it was the same bug (cpu
 > > spinning in pmd_lock()).
 > 
 > I'm still hoping you can give a back trace. I'd like to know what access it
 > is that can trigger this, and preferably what the call chain to it was...
 > 
 > I do believe it happened in 3.17, I just want to understand the but more -
 > not just apply the fix..
 > 
 > Most of Dave's lockup back traces did not have the whole page fault in
 > them, so while Dave has seen this too, there might be different symptoms...

Before giving 3.17 a multi-day workout, I'll try rc6 with Jürgen's patch
to see if that makes any difference at all for me.

	Dave

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