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

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Date:	Wed, 2 Dec 2015 12:14:56 -0500
From:	Chris Mason <clm@...com>
To:	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>
Subject: Re: 4.4rc3 nfsd/btrfs kasan warning.

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.

-chris

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