Re: [lkp] [nfsd] b44061d0b9: BUG: Dentry ffff880027d7c540{i=1846f,n=0a} still in use (1) [unmount of btrfs vda]

[Josef Bacik]

On 08/10/2016 02:25 PM, Linus Torvalds wrote:
> On Wed, Aug 10, 2016 at 11:22 AM, Josef Bacik <jbacik@xxxxxx> wrote:
> > On 08/10/2016 02:06 PM, Linus Torvalds wrote:
> > > More information in the original email on lkml.
> >
> > I'm not subscribed to lkml and for some reason I can't find the original
> > email in any of the lkml/linux-nfs archives.  Could you forward more of the
> > details?
>
> Done.

Looks like an NFS problem.  Before in the !resfhp->fh_dentry case we would do a 
lookup_one_len() and carry on.  Now we do the lookup_one_len(), call into 
nfsd_create_locked() and do a dget on resfhp->f_dentry, which from looks of it 
is the dentry we just did a lookup_one_len() on, so we have one more ref on the 
dentry than we did previously.  Thanks,

Josef