I think this might be due to a buggy "raidstop". I seem to recall
someone having a similar problem some months ago. It turned out that
they we using a vendor supplied raidstop that did the wrong thing.
Could you try compiling raid-tools from
and see if that works.
Alternaltely, get mdctl from
mdctl --stop /dev/md0
If this still doesn't work, please send me an "strace" of raidstop
running and failing.
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