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 11:06:35 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	kernel test robot <xiaolong.ye@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>, Chris Mason <clm@...com>,
	Josef Bacik <jbacik@...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 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.

                 Linus