https://bugs.freedesktop.org/show_bug.cgi?id=108464
--- Comment #23 from Duncan Roe duncan_roe@optusnet.com.au --- Here are some notes for anyone trying to reproduce this problem. By "this problem" I mean failure to reboot after "reboot" command issued.
1. On my system (Slackware, no systemd) I am triggering a reboot by Ctl-Alt-Del and this line in /etc/inittab: ca::ctrlaltdel:/sbin/shutdown -t5 -r now
2. I am only booting up to the command line (no X).
3. The occurrence of BUG is intermittent. I am seeing it on about 2 reboots in 3.
4. If there is no BUG, the next reboot will be OK.
5. If a user logs in before Ctl-Alt-Del, reboot with BUG still works maybe 90% of the time.
6. With BUG present, Ctl-Alt-Del at the login prompt succeeds about 50% of the time (measured over 25 reboots). (I put a dmesg command in rc.local to do this test).
With e1cb3e4801 reverted, reboot always works and BUG never shows. Were it not for that, I would be suspecting a local hardware problem by now