[Unionfs] UnionFS over NFS freezes

[Ricardo Silva]

I've looked around but I didn't find any post concerning my problem.

I'm mounting 3 directories from a remote machine using NFS and I want to use 
UNIONFS to merge those 3 with a 4th local one. All of them read-only. It 
seems to works OK, I can read any file, etc... but, when I do a 'df' the 
machine freezes completly.

# uname -r
2.4.21-47.EL.cernsmp

# cat /etc/fstab
(...)
/dev/sdb1                         /dump/0                       xfs      
defaults                    0 0
10.10.10.20:/dump/0     /dump/remote/0          nfs     rw,hard,intr,tcp     
    0 0
10.10.10.20:/dump/1     /dump/remote/1          nfs     rw,hard,intr,tcp     
    0 0
10.10.10.20:/dump/2     /dump/remote/2          nfs     rw,hard,intr,tcp     
    0 0
10.10.10.20:/dump/3     /dump/remote/3          nfs     rw,hard,intr,tcp     
    0 0
unionfs                 /dump/public_html/all   unionfs 
ro,dirs=/dump/0/=ro:/dump/remote/0/=ro:/dump/remote/1/=ro:/dump/remote/2/=ro:/dump/remote/3/=ro 
    0 0

# mount
(...)
/dev/sdb1 on /dump/0 type xfs (rw)
10.10.10.20:/dump/0 on /dump/remote/0 type nfs 
(rw,hard,intr,tcp,addr=10.10.10.20)
10.10.10.20:/dump/1 on /dump/remote/1 type nfs 
(rw,hard,intr,tcp,addr=10.10.10.20)
10.10.10.20:/dump/2 on /dump/remote/2 type nfs 
(rw,hard,intr,tcp,addr=10.10.10.20)
10.10.10.20:/dump/3 on /dump/remote/3 type nfs 
(rw,hard,intr,tcp,addr=10.10.10.20)
unionfs on /dump/public_html/all type unionfs 
(ro,dirs=/dump/0/=ro:/dump/remote/0/=ro:/dump/remote/1/=ro:/dump/remote/2/=ro:/dump/remote/3/=ro)

Unionfs is 1.0.14, compiled from source.
Any idea of what the problem could be?
Is there any more info I can provide that could help you understand the 
problem?

Cheers,
Ricardo Silva

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