So the problem is that running "rc 6" when the "current runlevel" (as determined by /var/run/utmp) is 6 does nothing.
The same bug would occur if you put "shutdown -h now" inside /etc/rc0.d, it would cancel the running shutdown, and then do nothing. sysvinit handles this simply by not allowing a change from to the same runlevel as the current one. We could replicate that fix by making shutdown (and telinit) check the runlevel first -- currently they just send the event regardless. There's another semi-bug here, if you press Ctrl-Alt-Del while "shutdown -h now" (not -r) is running, then the flip is from runlevel 0 to runlevel 6; this is something sysvinit allows -- and responds badly to. sysv-rc skips everything except the final S90reboot script because everything else exists in the previous runlevel. upstart exhibits the same behaviour in that circumstance. -- Ctl+Alt+Del twice at tty console login gives root access https://launchpad.net/bugs/63852 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
