linux-kernel - Re: splice vs execve lockdep trace.

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Message-ID: <alpine.DEB.2.02.1307160956370.15153@pianoman.cluster.toy>
Date:	Tue, 16 Jul 2013 09:59:35 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>, Ben Myers <bpm@....com>,
	xfs@....sgi.com
Subject: Re: splice vs execve lockdep trace.

On Mon, 15 Jul 2013, Linus Torvalds wrote:

> On Mon, Jul 15, 2013 at 7:38 PM, Dave Jones <davej@...hat.com> wrote:
> 
> > Interestingly, the 'soft lockups' I was
> > seeing all the time on that box seem to have gone into hiding.
> 
> Honestly, I'm somewhat inclined to blame the whole perf situation, and
> saying that we hopefully got that fixed. In between the silly do_div()
> buglets and all the indications that the time was spent in nmi
> handlers, I'd be willing to just ignore them as false positives
> brought on by the whole switch to the perf irq..

Did the perf soft lockups go away with 3.11-rc1?

734df5ab549ca44f40de0f07af1c8803856dfb18 finally got committed,
and it fixes a major long-standing perf-related NMI soft lockup bug I 
found when fuzzing.

Vince
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