I have this happen quite frequently as well, and only on /dev/md0. I end up
having to reboot to single user to work with it in these situations. The
other md devices (two others) stop and start just fine.
> lsof isnt always the most reliable to tools if a kernel thread or nfs
> ran off with it. Is md0 doing anything else - like rebuilding. Is there
> anything that has been triggered or run from it - paticularly kernel
> threads
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