I did some more research on this problem and it's udevd itself.
Activating the debug output gives me the following message after 60
seconds:

timeout, giving up waiting for workers to finish

This message comes from udevd.c:1626 when epoll_wait times out. After this 
message udevd will immediately exit without waiting for the other worker 
threads. I'm not sure why the kernel doesn't signal udevd.
I've also tested this with the recent kernel 3.0.0-15 from oneiric-propsed with 
the same result.
Maybe we should raise this bug as critical because Ubuntu is currently not 
really usable on a lvm partition.

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https://bugs.launchpad.net/bugs/906358

Title:
  udev and lvm2 hang at boot

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