From: z00t@gmx.net
Subject: umount fails with device busy
Date: Thu, 23 Aug 2007 20:45:44 +0200
Message-ID: <20070823184544.237460@gmx.net>
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To: nfs@lists.sourceforge.net
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Errors-To: nfs-bounces@lists.sourceforge.net

Hi guys,

I get the device busy error when I try to umount an NFS file system althoug=
h 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 sto=
pping an application which has its executables and work directory on this f=
ile system. Running umount again some seconds later works fine. =


I do not have any submounts under this mount point. There are no packet tra=
nsmit 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 t=
erminated:

  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=3D1 i=
nfo=3D0x6)
  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=3D1 info=
=3D0x6)
  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: dentr=
y_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: dentr=
y_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: dentr=
y_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!


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