linux-kernel - Re: frequent softlockups with 3.10rc6.

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Message-ID: <20130626194039.GA2833@redhat.com>
Date:	Wed, 26 Jun 2013 15:40:39 -0400
From:	Dave Jones <davej@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Vagin <avagin@...nvz.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: frequent softlockups with 3.10rc6.

On Wed, Jun 26, 2013 at 09:18:53PM +0200, Oleg Nesterov wrote:
 > On 06/25, Dave Jones wrote:
 > >
 > > Took a lot longer to trigger this time. (13 hours of runtime).
 > 
 > And _perhaps_ this means that 3.10-rc7 without 8aac6270 needs more
 > time to hit the same bug ;)
 > 
 > Dave, I am not going to "deny the problem". We should investigate it
 > anyway. And yes, 8aac6270 is not as trivial as it looks.
 > 
 > But so far it is absolutely unclear how it can trigger such a problem,
 > and none of the traces _look_ as if it should be blamed.
 > 
 > Probably I should try to reproduce too...

I've tried so many different kernels this last week that I've forgotten
just how long I left the build without 8aac6270 running, but I'm pretty
sure it included an overnight run last weekend.  Given I have two identical
machines that can reproduce it, I'll leave one running for a few days
with that reverted just to see if it turns up.

(Though, I seem to be walking into other issues [like the perf overflow bug
 I reported last night] before seeing the lockups reproduce,  so I'll keep an eye on it).

	Dave
 
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