Any chance you can look at this Superblock v1 bug Neil?

[Fwd: bug report: mdadm-devel-2 , superblock version 1]

I believe I've now tryed this with a patched mdadm devel-2, and a 
2.6.13-rc3-mm1 kernel (which as a few recent md patches), with the same 
results.

Thanks,
Tyler.