linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Fri, 12 Dec 2014 14:23:09 -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>
Subject: Re: frequent lockups in 3.18rc4

On Fri, Dec 12, 2014 at 11:14:06AM -0800, Linus Torvalds wrote:
 > On Fri, Dec 12, 2014 at 10:54 AM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > Something that's still making me wonder if it's some kind of hardware
 > > problem is the non-deterministic nature of this bug.
 > 
 > I'd expect it to be a race condition, though. Which can easily cause
 > these kinds of issues, and the timing will be pretty random even if
 > the load is very regular.
 > 
 > I'm also not sure if the bug ever happens with preemption disabled.

After tomorrow, I'm not going to be in front of this machine until
Wednesday, so I'll leave a no-preempt build running for the duration.
Hopefully that will give us some clues.  I might be able to log into
it while travelling, so I'll provide updates where possible as long
as it doesn't wedge solid.

	Dave

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