NFSD on XFS with RT subvolume

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Hi All,

Exporting an XFS volume with kernel NFSD when real-time subvolume is
enabled hangs the kernel.

I'm using vanilla LK 2.6.22.7; first I create the XFS volume with two
partitions of 20GB each with extent size of 1MB; then I create a
subdirectory in the volume and mark it (using xfs_io util) as it belongs
to the rt subvolume with inheritance flag.

After mounting that volume through NFSv3 / UDP; and trying a 'dd
if=/dev/zero of=/mnt/rt/test bs=1M count=1000' the machine running NFSD
hangs infinitely.

Did anyone try that before? 

Thanks for the help,
Rabeeh
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