[arch-general] udev and/or device-mapper problem

I updated to udev, cryptsetup and device mapper from testing the installed kernel 2.6.32.6 and rebooted. now /dev/mapper/root and /dev/dm-0 are not there but /etc/mtab mentions /dev/mapper/root /dev/mapper/home and /dev/dm-1 exist The computer boots till the fsck part then stops because there is no /dev/mapper/root to fsck. I'm trying not to touch any libpng/libjpeg stuff in testing but non of those messes up booting anyway. After fsck fails, it dropped me to a shell. I downgraded udev and device-mapper, recreated the kernel image and I can boot now. Any ideas?