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

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Date:	Wed, 10 Aug 2016 14:32:47 -0400
From:	Josef Bacik <jbacik@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	kernel test robot <xiaolong.ye@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>, Chris Mason <clm@...com>,
	David Sterba <dsterba@...e.com>,
	"J. Bruce Fields" <bfields@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: [lkp] [nfsd] b44061d0b9: BUG: Dentry
 ffff880027d7c540{i=1846f,n=0a} still in use (1) [unmount of btrfs vda]

On 08/10/2016 02:25 PM, Linus Torvalds wrote:
> On Wed, Aug 10, 2016 at 11:22 AM, Josef Bacik <jbacik@...com> 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