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0e1f616
(Get the code!)
@Wessel, could you describe the deadlock you are talking about?
The hang I see is not a really a deadlock - it can't happen at random, but only if udev is killed before it can acknowledge the DM_COOKIE. Preventing udev's exit from blocking on the vgchange completing also addressed that one. But perhaps there is another potential deadlock, which could happen even with a simple 'pvcreate' long after exiting initramfs?
The comments in libdevmapper.h certainly seem to imply that it is better to pass flags along in a DM_COOKIE, although 55-dm.rules appears to handle the case of no cookie. Can you explain if there is any real downside to using --noudevsync?