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

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Message-ID: <20151202190138.GF8918@ret.masoncoding.com>
Date:	Wed, 2 Dec 2015 14:01:38 -0500
From:	Chris Mason <clm@...com>
To:	Andrey Ryabinin <ryabinin.a.a@...il.com>
CC:	Dave Jones <davej@...emonkey.org.uk>, 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>, <conchur@....de>
Subject: Re: 4.4rc3 nfsd/btrfs kasan warning.

On Wed, Dec 02, 2015 at 09:32:34PM +0300, Andrey Ryabinin wrote:
> 2015-12-02 20:14 GMT+03:00 Chris Mason <clm@...com>:
> > 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.
> >
> 
> I think it just empty bitmaps list.
>  list_first_entry() can't be used on empty list.

Ohh, I was so busy looking for free'd entries I missed that.  Good
point.

-chris
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