linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141217201630.GA27208@redhat.com>
Date:	Wed, 17 Dec 2014 15:16:30 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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 11:51:45AM -0800, Linus Torvalds wrote:
 > 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.

Yup, that seems to be the only obvious bug in those commits.
It's survived for long with that change on top.

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

Now let's see how long it runs for..

	Dave
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