[Bug 585027] Re: Race condition with dmsetup causes 'map already present' messages

[Peter Petrakis]

Using the lucid kernel, I was able to reproduce, though it took a lot longer than
original report implied, easily over an hour, probably more than 3 I wasn't watching
it the entire time.

multipath-tools 0.4.8-14ubuntu4.10.04.2
kernel  2.6.32-41-generic

udevadm monitor simply stops responding.

I cannot remove the dm maps, they say "busy/in use". They
are not mounted or used by anyone.

Using the same kernel and multipath 0.4.9-3ubuntu5 I was
unable to reproduce the issue. So this older kernel helps expose the
problem.

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Title:
  Race condition with dmsetup causes 'map already present' messages

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