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67d34a1
(Get the code!)
We also see somehow similar issues here sporadically on a number of machines with 10.04.1 - in our case, we only have a data-RAID which is not necessary for mounting root partition. And this data raid will stay half-way assembled on some boots.
Currently, we think it's caused by udevd being killed in the middle of its operation, see #613273.
If "mdadm --incremental" is interrupted at the wrong moment, it seems to cause a lot of weird issues - ranging from a leftover /dev/.tmp.md.8:xx which makes mdadm bailing out with "Strange error loading metadata for /dev/md0" for all future operations until reboot to completely damaged data structures in the kernel with wrong device numbers, half-busy devices and the like.