Re: umount fails with device busy

[Zoot <z00t@gmx.net>]

On Thu, Aug 23, 2007 at 04:03:17PM -0400, Chuck Lever wrote:
> z00t@gmx.net wrote:
> >Hi guys,
> >
> >I get the device busy error when I try to umount an NFS file system 
> >although there is no process with an open file on it (at least fuser -m 
> >/mnt/point and lsof +f -- /mnt/point don't find anything).
> >
> >To be more precise this only happens, when I run the umount right after 
> >stopping an application which has its executables and work directory on 
> >this file system. Running umount again some seconds later works fine. 
> >I do not have any submounts under this mount point. There are no packet 
> >transmit or receive errors nor any NFS/RPC errors only a very small number 
> >of RPC retransmitts. So it seems that I have a stable environment. Client 
> >and server is SLES9 with 2.6.5-7.202.7-smp/X86_64. 
> >I enabled NFS debug output and the only noticeable thing is, that some NFS 
> >operations are still ongoing after the application processes have already 
> >terminated:
> >
> >  Aug 23 08:25:23 marvin kernel: NFS reply getattr
> >  Aug 23 08:25:23 marvin kernel: NFS: nfs_update_inode(0:12/149296 ct=1 
> >  info=0x6)
> >  Aug 23 08:25:23 marvin kernel: NFS: (0:12/149296) revalidation complete
> >  Aug 23 08:25:23 marvin kernel: nfs: flush(0:12/149296)
> >  Aug 23 08:25:23 marvin kernel: NFS: dentry_delete(bin/stop, 0)
> >  Aug 23 08:25:23 marvin kernel: NFS: revalidating (0:12/2)
> >  Aug 23 08:25:23 marvin kernel: NFS call  getattr
> >  Aug 23 08:25:23 marvin kernel: NFS reply getattr
> >  Aug 23 08:25:23 marvin kernel: NFS: nfs_update_inode(0:12/2 ct=1 
> >  info=0x6)
> >  Aug 23 08:25:23 marvin kernel: NFS: (0:12/2) revalidation complete
> >  Aug 23 08:25:25 marvin kernel: NFS call  fsstat
> >  Aug 23 08:25:25 marvin kernel: NFS reply statfs: 0
> >  Aug 23 08:25:35 marvin kernel: NFS call  fsstat
> >  Aug 23 08:25:35 marvin kernel: NFS reply statfs: 0
> >  Aug 23 08:25:38 marvin kernel: NFS: 6368 initiated commit call
> >  Aug 23 08:25:38 marvin kernel: NFS: 6369 initiated commit call
> >  Aug 23 08:25:38 marvin kernel: NFS: 6370 initiated commit call
> >  Aug 23 08:25:38 marvin kernel: NFS: 6371 initiated commit call
> >  Aug 23 08:25:38 marvin kernel: NFS: 6368 nfs_commit_done (status 0)
> >  Aug 23 08:25:38 marvin kernel: NFS: commit (0:12/121805 3207@0)NFS: 
> >  dentry_delete(log/mux_marvin.trc, 0)
> >  Aug 23 08:25:38 marvin kernel:  OK
> >  Aug 23 08:25:38 marvin kernel: NFS: 6369 nfs_commit_done (status 0)
> >  Aug 23 08:25:38 marvin kernel: NFS: commit (0:12/149304 2238@0)NFS: 
> >  dentry_delete(log/pw_marvin_1.trc, 0)
> >  Aug 23 08:25:38 marvin kernel:  OK
> >  Aug 23 08:25:38 marvin kernel: NFS: 6370 nfs_commit_done (status 0)
> >  Aug 23 08:25:38 marvin kernel: NFS: commit (0:12/149297 2238@0)NFS: 
> >  dentry_delete(log/pw_marvin_0.trc, 0)
> >  Aug 23 08:25:38 marvin kernel:  OK
> >  Aug 23 08:25:38 marvin kernel: NFS: 6371 nfs_commit_done (status 0)
> >  Aug 23 08:25:38 marvin kernel: NFS: commit (0:12/149295 965@0)NFS: 
> >  dentry_delete(net.trc, 0)
> >  Aug 23 08:25:38 marvin kernel:  OK
> >  Aug 23 08:25:45 marvin kernel: NFS call  fsstat
> >  Aug 23 08:25:45 marvin kernel: NFS reply statfs: 0
> >  Aug 23 08:25:55 marvin kernel: NFS call  fsstat
> >
> >When I run umount during these ops I get an device busy. Any help would be 
> >very appreciated!
> 
> This is normal and expected behavior.  One problem may be that your 
> server is slow, and thus there are RPCs left outstanding for a bit on 
> your client after your application exits.  The COMMIT calls from that 
> trace suggest that there is dirty data the client is writing back to the 
> server.
But I had expected that umount blocks until the commit calls are finished as it is with local file systems?

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