So far this is the same as bug 802626, marking this one as duplicate of it. Also, this is an userspace synchronization problem, not kernels's fault.
Besides using --noudevsync, another solution is patching udev to not ignore relevant lvm notifications from the kernel (events with DM_COOKIE set) on exit: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/802626/comments/53
So far this is the same as bug 802626, marking this one as duplicate of it. Also, this is an userspace synchronization problem, not kernels's fault.
Besides using --noudevsync, another solution is patching udev to not ignore relevant lvm notifications from the kernel (events with DM_COOKIE set) on exit: https:/ /bugs.launchpad .net/ubuntu/ +source/ lvm2/+bug/ 802626/ comments/ 53