On Wed, Sep 14, 2016 at 03:19:18PM +0200, Holger Hoffstätte wrote:
> On 09/14/16 04:02, Liu Bo wrote:
> > The extent buffer 'next' needs to be free'd conditionally.
> > 
> > Signed-off-by: Liu Bo <bo.li....@oracle.com>
> > ---
> >  fs/btrfs/extent-tree.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> > index 5a940ab..779fd72 100644
> > --- a/fs/btrfs/extent-tree.c
> > +++ b/fs/btrfs/extent-tree.c
> > @@ -8882,6 +8882,7 @@ static noinline int do_walk_down(struct 
> > btrfs_trans_handle *trans,
> >                                    &wc->flags[level - 1]);
> >     if (ret < 0) {
> >             btrfs_tree_unlock(next);
> > +           free_extent_buffer(next);
> >             return ret;
> >     }
> >  
> > 
> 
> This was fixed a long time ago by the following patch by Josef:
> 
> "Btrfs: don't BUG() during drop snapshot"
> https://patchwork.kernel.org/patch/7002791/
> 
> ..which never got merged.

The patch was buried in some thread, not even a subject gives a hint
there's a patch, but anyway thanks for pointing it out.
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