Seems the same problem here:
After upgrade to natty, once after ~10 reboots system hangs while initrd tries 
to bing up lvm.

I have no rules in /etc/udev/rules.d in my initrd.
I have no nested LVs and even have this filter in my lvm.conf: filter = [ 
"a|^/dev/sd.*|", "r|.*|" ]

ps shows this:
  244 0         4124 S    /lib/udev/watershed sh -c /sbin/lvm vgscan; /sbin/lv
  245 0         4412 S    sh -c /sbin/lvm vgscan; /sbin/lvm vgchange -a y
  247 0         4124 S    /lib/udev/watershed sh -c /sbin/lvm vgscan; /sbin/lv
  248 0        34996 S <  /sbin/lvm vgchange -a y

No LV is in active state.
So initrd can not mount the root.

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https://bugs.launchpad.net/bugs/789930

Title:
  [natty] boot hangs / udev vgchange deadlock in nested vgs?

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