From 186, /etc/init.d/udev does not obey udev_debug anymore. In fact, the init script uses get_rundir() to get the directory to which put the log file. But get_rundir() relies on udevadm info --run while --run is not a valid option anymore. start_udevmonitor() is probably affected too. Reproducible: Always
*** Bug 427218 has been marked as a duplicate of this bug. ***
This is fixed in commit bc71a9. It will be included with udev-init-scripts-14 which will be released with udev-187.