[Bug] NFSv4 fails to work without ipv6 kernel module

[Andrew Savchenko <bircoph@gmail.com>]

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Hello,

I have ipv6 support as a module (it may be needed in the recent 
future), but currently I want ipv6 to be disabled on my system, so 
I blacklisted this module. And here problems begin...

NFSv3 works flawlessly:
# mount 172.19.0.1:/home/ftp /mnt/nfs/

but NFSv4 fails:
# mount -t nfs4 172.19.0.1:/ /mnt/nfs/
mount.nfs4: Cannot allocate memory

After modprobe ipv6 it works:
# mount -t nfs4 172.19.0.1:/ /mnt/nfs/

I recompiled nfs-utils without ipv6 support, but this doesn't help.

Here is my /etc/exports:
/home/ftp 172.16.0.0/12
(ro,async,crossmnt,no_subtree_check,fsid=0,all_squash) \
        127.0.0.1/32
(ro,async,crossmnt,no_subtree_check,fsid=0,all_squash)

I use nfs-utils-1.1.5, I tested this on both vanilla linux kernels 
2.6.28.7 and 2.6.28.9.

-- 
Best regards,
Andrew

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