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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Message-ID: <dc406145-b465-b7e9-e370-91910abb8e6a@fb.com>
Date:	Wed, 10 Aug 2016 14:22:07 -0400
From:	Josef Bacik <jbacik@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	kernel test robot <xiaolong.ye@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>, Chris Mason <clm@...com>,
	David Sterba <dsterba@...e.com>
CC:	"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 02:06 PM, Linus Torvalds wrote:
> On Tue, Aug 9, 2016 at 10:39 PM, kernel test robot
> <xiaolong.ye@...el.com> wrote:
>>
>> [ 1537.558739] nfsd: last server has exited, flushing export cache
>> [ 1540.627795] BUG: Dentry ffff880027d7c540{i=1846f,n=0a}  still in use (1) [unmount of btrfs vda]
>> [ 1540.633915] ------------[ cut here ]------------
>> [ 1540.636551] WARNING: CPU: 0 PID: 20552 at fs/dcache.c:1474 umount_check+0x72/0x80
>
> Hmm. Adding Al and the btrfs people to the cc, and expanding the nfs
> list. Unlike the flakey-IO warning, this one sounds like a real issue.
> Whether it's some dentry leak by nfsd or a VFS or btrfs issue, I can't
> begin to guess. Al, ideas?
>
> 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? 
Thanks,

Josef