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Re: splice vs execve lockdep trace.

To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: splice vs execve lockdep trace.
From: Dave Jones <davej@xxxxxxxxxx>
Date: Mon, 15 Jul 2013 23:28:41 -0400
Cc: 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>
Mail-followup-to: Dave Jones <davej@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>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Jul 15, 2013 at 08:25:14PM -0700, Linus Torvalds wrote:
 
 
 > And looking more at that, I'm actually starting to think this is an
 > XFS locking problem. XFS really should not call back to splice while
 > holding the inode lock.
 > 
 > But that XFS code doesn't seem new either. Is XFS a new thing for you
 > to test with?

I started pounding on it fairly recently and have shook out a number
of bugs (now fixed) since I started, so relatively new, but on the order of 
'months' now.

        Dave

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