I compared upstart's halt/poweroff implementation to sysvinit's, and
there are a few differences which might be relevant. After #define
translation, the halt/poweroff bit in sysvinit does:
reboot(RB_ENABLE_CAD);
kill(1, SIGTSTP);
if (do_poweroff)
reboot(RB_POWER_OFF);
reboot(RB_HALT);
The fallthrough appears to be deliberate; RB_ENABLE_CAD seems at least
useful; and is it possible that the kernel's getting stuck before
poweroff because init hasn't been SIGTSTPed?
--
upstart fails to power off my system
https://launchpad.net/bugs/59134
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