linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141121174500.3facb44a@gandalf.local.home>
Date:	Fri, 21 Nov 2014 17:45:00 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andy Lutomirski <luto@...capital.net>, Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>, Don Zickus <dzickus@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: frequent lockups in 3.18rc4

On Fri, 21 Nov 2014 22:50:41 +0100
Frederic Weisbecker <fweisbec@...il.com> wrote:
\
> > Otherwise if we have a page fault inside do_page_fault, it's just a
> > nested page fault.
> 
> Oh ok!
> 
> But we still have the cr2 issue that Steve talked about.
>

Nope, as I looked at the code, I noticed that do_page_fault isn't traced
which is the wrapper for __do_page_fault which is. And do_page_fault()
saves off the cr2 before calling anything else.

So we are ok in this respect as well.

-- Steve
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