Public bug reported:

Binary package hint: linux-source-2.6.20

Df will hang if one of the branches in a Unionfs filesystem is a NFS
mount.

To reproduce:

1. Mount NFS filesystem, i.e.

    mount 10.0.1.3:/test /mnt

2. Mount writable filesystem, i.e.
 
     mount -t tmpfs none /cow

3. Create Unionfs filesystem

    mount -n -t unionfs -o dirs=/cow=rw:/mnt=nfsro unionfs /mnt

4. Execute df command

    df

This bug is related to bug #85145.  The underlying cause is the same
(NFS changes in 2.6.19 kernel).  This bug only occurs once bug #85145 is
fixed.

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Medium
     Assignee: Phillip Lougher
         Status: In Progress

** Changed in: linux-source-2.6.20 (Ubuntu)
   Importance: Undecided => Medium
     Assignee: (unassigned) => Phillip Lougher
       Status: Unconfirmed => In Progress

-- 
Unionfs: 'df' hangs if an Unionfs branch is a NFS mount
https://launchpad.net/bugs/90088

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