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Re: splice vs execve lockdep trace.

To: Vince Weaver <vince@xxxxxxxxxx>
Subject: Re: splice vs execve lockdep trace.
From: Dave Jones <davej@xxxxxxxxxx>
Date: Tue, 16 Jul 2013 11:02:17 -0400
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Ben Myers <bpm@xxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <alpine.DEB.2.02.1307160956370.15153@xxxxxxxxxxxxxxxxxxxx>
Mail-followup-to: Dave Jones <davej@xxxxxxxxxx>, Vince Weaver <vince@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Ben Myers <bpm@xxxxxxx>, xfs@xxxxxxxxxxx
References: <20130716015305.GB30569@xxxxxxxxxx> <CA+55aFyLbqJp0-=7=HOF9sKGOHwsa7A7-V76b8tbsnra8Z2=-w@xxxxxxxxxxxxxx> <20130716023847.GA31481@xxxxxxxxxx> <CA+55aFxiGXht8+Dox=C2ezYYf1yMaLAzMYr40j=+peP8j5Ha6w@xxxxxxxxxxxxxx> <alpine.DEB.2.02.1307160956370.15153@xxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
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@xxxxxxxxxx> 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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