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Re: splice vs execve lockdep trace.

To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: splice vs execve lockdep trace.
From: Vince Weaver <vince@xxxxxxxxxx>
Date: Tue, 16 Jul 2013 09:59:35 -0400 (EDT)
Cc: Dave Jones <davej@xxxxxxxxxx>, 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: <CA+55aFxiGXht8+Dox=C2ezYYf1yMaLAzMYr40j=+peP8j5Ha6w@xxxxxxxxxxxxxx>
References: <20130716015305.GB30569@xxxxxxxxxx> <CA+55aFyLbqJp0-=7=HOF9sKGOHwsa7A7-V76b8tbsnra8Z2=-w@xxxxxxxxxxxxxx> <20130716023847.GA31481@xxxxxxxxxx> <CA+55aFxiGXht8+Dox=C2ezYYf1yMaLAzMYr40j=+peP8j5Ha6w@xxxxxxxxxxxxxx>
User-agent: Alpine 2.02 (DEB 1266 2009-07-14)
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.


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