Date: Wed, 2 Dec 2015 12:14:56 -0500
From: Chris Mason <clm@fb.com>
To: Dave Jones <davej@codemonkey.org.uk>, Josef Bacik <jbacik@fb.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        "J. Bruce Fields" <bfields@fieldses.org>,
        Jeff Layton <jlayton@poochiereds.net>, David Sterba <dsterba@suse.com>
Subject: Re: 4.4rc3 nfsd/btrfs kasan warning.
Message-ID: <20151202171320.GE8918@ret.masoncoding.com>
Mail-Followup-To: Chris Mason <clm@fb.com>,
	Dave Jones <davej@codemonkey.org.uk>, Josef Bacik <jbacik@fb.com>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	"J. Bruce Fields" <bfields@fieldses.org>,
	Jeff Layton <jlayton@poochiereds.net>,
	David Sterba <dsterba@suse.com>
References: <20151202145907.GA9425@codemonkey.org.uk>
 <565F0A20.40200@fb.com>
 <20151202160942.GA16348@codemonkey.org.uk>
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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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