Re: Busy inodes after umount

From: Ragnar Kj°rstad (xfs@ragnark.vestdata.no)
Date: Mon Jul 30 2001 - 19:15:47 EST


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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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:48 EST