(Klaus, did you really mean to close this bug report with your last message? I'll go ahead and reopen it since I'm also affected by this bug.)
>From what I understand, this bug affects entries of the form `/dev/md0` in `mdadm.conf`, and was introduced by commit 84d969be, which now always looks for `/dev/md/$(basename)`, resulting in failures when attempting to access the non-existent `/dev/md/md0`. (Until this is resolved, a simple `../md0` symlink seems to do the job as a temporary fix.)
