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Re: 3.14.0-rc2: WARNING: at mm/slub.c:1007

To: Christian Kujau <lists@xxxxxxxxxxxxxxx>
Subject: Re: 3.14.0-rc2: WARNING: at mm/slub.c:1007
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 14 Feb 2014 12:14:53 +1100
Cc: LKML <linux-kernel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-mm@xxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <alpine.DEB.>
References: <alpine.DEB.> <20140213222602.GK13997@dastard> <alpine.DEB.>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Feb 13, 2014 at 03:34:19PM -0800, Christian Kujau wrote:
> On Fri, 14 Feb 2014 at 09:26, Dave Chinner wrote:
> > > after upgrading from 3.13-rc8 to 3.14.0-rc2 on this PowerPC G4 machine, 
> > > the WARNING below was printed.
> > > 
> > > Shortly after, a lockdep warning appeared (possibly related to my 
> > > post to the XFS list yesterday[0]).
> > 
> > Unlikely.
> OK, so the "possible irq lock inversion dependency detected" is a lockdep 
> regression, as you explained in the xfs-list thread. What about the 
> "RECLAIM_FS-safe -> RECLAIM_FS-unsafe lock order detected" warning - I 
> haven't seen it again though, only once with 3.14.0-rc2.

That was also an i_lock/mmapsem issue, so it's likely to be the same
root cause. I'm testing a fix for it at the moment.


Dave Chinner

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