linux-kernel - Re: [REGRESSION] nfsd crashing with 3.6.0-rc7 on PowerPC

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Message-ID: <20120928151043.GA19102@fieldses.org>
Date:	Fri, 28 Sep 2012 11:10:43 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Alexander Graf <agraf@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML List <linux-kernel@...r.kernel.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-nfs@...r.kernel.org, Jan Kara <jack@...e.cz>,
	skinsbursky@...allels.com, bfields@...hat.com
Subject: Re: [REGRESSION] nfsd crashing with 3.6.0-rc7 on PowerPC

On Fri, Sep 28, 2012 at 04:19:55AM +0200, Alexander Graf wrote:
> 
> On 28.09.2012, at 04:04, Linus Torvalds wrote:
> 
> > On Thu, Sep 27, 2012 at 6:55 PM, Alexander Graf <agraf@...e.de> wrote:
> >> 
> >> Below are OOPS excerpts from different rc's I tried. All of them crashed - all the way up to current Linus' master branch. I haven't cross-checked, but I don't remember any such behavior from pre-3.6 releases.
> > 
> > Since you seem to be able to reproduce it easily (and apparently
> > reliably), any chance you could just bisect it?
> > 
> > Since I assume v3.5 is fine, and apparently -rc1 is already busted, a simple
> > 
> >   git bisect start
> >   git bisect good v3.5
> >   git bisect bad v3.6-rc1
> > 
> > will get you started on your adventure..
> 
> Heh, will give it a try :). The thing really does look quite bisectable.
> 
> 
> It might take a few hours though - the machine isn't exactly fast by today's standards and it's getting late here. But I'll keep you updated.

I doubt it's anything special about that workload, but just for kicks I
tried a "git clone -ls" (cloning my linux tree to another directory on
the same nfs filesystem), with server on 3.6.0-rc7, and didn't see
anything interesting (just an xfs lockdep warning that looks like this
one jlayton already reported:
http://oss.sgi.com/archives/xfs/2012-09/msg00088.html
)

Any (even partial) bisection results would certainly be useful, thanks.

--b.
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