Re: 4.4rc3 nfsd/btrfs kasan warning.

From	Chris Mason <clm@fb.com>
Newsgroups	linux.kernel
Subject	Re: 4.4rc3 nfsd/btrfs kasan warning.
Date	2015-12-02 20:10 +0100
Message-ID	<qBkWS-2Tg-11@gated-at.bofh.it> (permalink)
References	<qBh2W-8un-21@gated-at.bofh.it> <qBhmh-sK-11@gated-at.bofh.it> <qBiin-161-33@gated-at.bofh.it> <qBjes-1JE-61@gated-at.bofh.it> <qBktP-2ty-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, Dec 02, 2015 at 09:32:34PM +0300, Andrey Ryabinin wrote:
> 2015-12-02 20:14 GMT+03:00 Chris Mason <clm@fb.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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4.4rc3 nfsd/btrfs kasan warning. Dave Jones <davej@codemonkey.org.uk> - 2015-12-02 16:00 +0100
  Re: 4.4rc3 nfsd/btrfs kasan warning. Josef Bacik <jbacik@fb.com> - 2015-12-02 16:20 +0100
    Re: 4.4rc3 nfsd/btrfs kasan warning. Dave Jones <davej@codemonkey.org.uk> - 2015-12-02 17:20 +0100
      Re: 4.4rc3 nfsd/btrfs kasan warning. Chris Mason <clm@fb.com> - 2015-12-02 18:20 +0100
        Re: 4.4rc3 nfsd/btrfs kasan warning. Dave Jones <davej@codemonkey.org.uk> - 2015-12-02 18:40 +0100
        Re: 4.4rc3 nfsd/btrfs kasan warning. Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2015-12-02 19:40 +0100
          Re: 4.4rc3 nfsd/btrfs kasan warning. Chris Mason <clm@fb.com> - 2015-12-02 20:10 +0100

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