linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Wed, 17 Dec 2014 11:51:45 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Suresh Siddha <sbsiddha@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Anvin <hpa@...ux.intel.com>
Subject: Re: frequent lockups in 3.18rc4

On Wed, Dec 17, 2014 at 10:57 AM, Dave Jones <davej@...hat.com> wrote:
> On Wed, Dec 17, 2014 at 01:22:41PM -0500, Dave Jones wrote:
>
>  > I'm going to try your two patches on top of .18, with the same kernel
>  > config, and see where that takes us.
>  > Hopefully to happier places.
>
> Not so much.  Died very quickly.

Damn, damn, damn. That's because of a stupid typo on the patches. We
have these very similar variables ("flags" and "fault") that have very
similar fault information, but they are completely different.

The "fault & FAULT_FLAG_USER" test is wrong, it should test "flags &
FAULT_FLAG_USER". Patch attached.

The half-way good news is that this certainly confirms that trinity is
triggering the "page fault with fatal signal pending" special case.

                             Linus

View attachment "patch.diff" of type "text/plain" (466 bytes)