linux-kernel - Re: 4.4rc3 nfsd/btrfs kasan warning.

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Message-ID: <20151202173609.GA10996@codemonkey.org.uk>
Date:	Wed, 2 Dec 2015 12:36:09 -0500
From:	Dave Jones <davej@...emonkey.org.uk>
To:	Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	David Sterba <dsterba@...e.com>
Subject: Re: 4.4rc3 nfsd/btrfs kasan warning.

On Wed, Dec 02, 2015 at 12:14:56PM -0500, Chris Mason wrote:
 > On Wed, Dec 02, 2015 at 11:09:43AM -0500, Dave Jones wrote:
 > > On Wed, Dec 02, 2015 at 10:11:28AM -0500, Josef Bacik wrote:
 > >  > On 12/02/2015 09:59 AM, Dave Jones wrote:
 > >  > > Got a few of these in the logs this morning after an overnight rsync over nfs
 > >  > > to an exported btrfs volume.
 > >  > 
 > >  > That's probably us and not NFS, what line is that in 
 > >  > setup_cluster_bitmap?  Thanks,
 > > 
 > > If my math is correct, it's this..
 > > 
 > >         if (entry->offset != bitmap_offset)
 > > 
 > > I don't seem to be able to trigger it on demand unfortunatly.
 > 
 > Is it possible we're blowing the stack?  It seems pretty tricky to get a
 > stack out of bounds out of this code without flat out blowing through
 > it.

Hm, there is a lot of debug crap on the stack from lockdep etc, though I didn't
get any warnings from the other stack overflow checks.

	Dave

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