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

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Message-ID: <20130716150217.GA825@redhat.com>
Date:	Tue, 16 Jul 2013 11:02:17 -0400
From:	Dave Jones <davej@...hat.com>
To:	Vince Weaver <vince@...ter.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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 Tue, Jul 16, 2013 at 09:59:35AM -0400, Vince Weaver wrote:
 > 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.

That could be it. I never got around to trying that commit standalone
when you first pointed it out.

thanks,

	Dave
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