Re: Busy inodes after umount

Tony Gale (gale@syntax.dera.gov.uk)
01 Aug 2001 09:18:40 +0100


Do you have any other patches in your kernel, such as grsecurity?

-tony

On 31 Jul 2001 02:15:47 +0200, Ragnar Kjørstad wrote:
> On Thu, Jul 19, 2001 at 07:38:15PM -0500, Tad Dolphay wrote:
> > > > I've now been able to reproduce:
> > > >
> > > > * make a filesystem
> > > > * mount it
> > > > * export it (nfs)
> > > > * mount on remote machine
> > > > * lock file (fcntl)
> > > > * unexport
> > > > * unmount
> > > >
> > > > Then you get the VFS message about self-destruct. Tested with both ext2
> > > > and xfs.
> > > >
> > > > The lock is still present in /proc/locks after the umount.
> > > >
> > > > With ext2 I can remount the filesystem successfully, but with XFS I get
> > > > the message about duplicate UUIDs and the mount failes. I believe this is a totally
> > > > different problem from the one you were experiencing. (and blockdev doesn't help for me)
> > > >
> > > > I suppose this is a generic kernel bug?
> >
> > I know there was a fix for a "Busy inodes after unmount" problem in
> > 2.4.6-pre3. Here's an excerpt from a posting to the NFS mailing list
> > from Neil Brown:
> >
> > -------------Included message-----------------------
> > Previously anonymous dentries were hashed (though with no name, the
> > hash was pretty meaningless). This meant that they would hang around
> > after the last reference was dropped. This was actually fairly
> > pointless as they would never get referenced again, and caused a real
> > problem as umount wouldn't discard them and so you got the message
> > printk("VFS: Busy inodes after unmount. "
> > "Self-destruct in 5 seconds. Have a nice day...\n");
> >
> > In 2.4.6-pre3 I stopped hashing those dentries so now when the last
> > reference is dropped, the dentry is freed. So now there will never be
> > more anonymous dentries than there are active nfsd threads.
> > ---------------end included message-------------------
>
> I just tested with 2.4.7, and the problem remains.
>
>
> --
> Ragnar Kjorstad
> Big Storage
>

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