Public bug reported:

Binary package hint: dmraid

Setup: 
* Upgrade from Lucid to Natty (problem didn't occur on Lucid)
* /dev/sd[ab] in fakeRAID setup w/rootFS on it
* /dev/sd[cdefgh] in an md RAID6

Upon upgrade, system will fail to assemble the RAID6, saying the block devices 
are busy:
mdadm: Cannot open /dev/sdc: Device or resource busy

This is due to dmraid having apparently detected the RAID group and udev
having ran dmraid-activate script over it.

** Affects: dmraid
     Importance: Unknown
         Status: Unknown

** Affects: udev
     Importance: Undecided
         Status: New

** Affects: dmraid (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 85-dmraid.rules dmraid mdadm udev

** Bug watch added: Debian Bug tracker #534274
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534274

** Also affects: dmraid via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534274
   Importance: Unknown
       Status: Unknown

** Also affects: udev
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/742145

Title:
  dmraid interferes with mdadm

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