Did you try to boot with the debug option removed from the cmdline? I had the same symptom as you (systemd-udevd prints hundreds of messages per second until the phone reboots). For some reason this only happens with the debug option set. please compare this (with 'debug' and bootloop): http://paste.ubuntu.com/14667442/ with this (no 'debug' and no bootloop): http://paste.ubuntu.com/14667455/