Segmentation Fault on Raidstop

just created a RAID 10 array -- a RAID 0 array on top of three RAID 1 pairs.

I did mkraid --really-force /dev/mdX for each of the RAID 1 arrays (md0, md1, md2). When I created my RAID 0 (md3), I realized I had forgotten to specify persistent superblock 1 in raidtab.

So, I went to stop md3 (raidstop /dev/md3) so that I could remake it and I got a "segmentation fault" error.

Does anybody know how to correct this problem?