I can confirm this is an issue. Like John I added a sleep before activating the volume and that resolved the problem for me.
--- lvm2.orig 2014-12-02 16:04:51.254868123 -0500 +++ /usr/share/initramfs-tools/scripts/local-top/lvm2 2014-12-02 16:05:02.773961951 -0500 @@ -60,6 +60,8 @@ modprobe -q dm-mod +sleep 3 + activate_vg "$ROOT" activate_vg "$resume" -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org