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Date: Thu, 3 Apr 2014 02:14:11 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Linus Torvalds <torvalds@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org> Cc: Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Aubrey Li <aubrey.li@...el.com>, Matthew Garrett <mjg59@...f.ucam.org> Subject: [BUG] x86: reboot doesn't reboot I noticed that one of my test boxes no longer does a reboot with the latest kernel. It goes down and shows: [ 51.589896] reboot: Restarting system [ 51.593567] reboot: machine restart And the system sounds like it turns off (the fans stop), but then I just sit there and wait, and wait and wait. The system never starts up again. I did a bisect and it landed on: a4f1987e4c54 "x86, reboot: Add EFI and CF9 reboot methods into the default list" which looks like a very likely suspect. I removed that and fb3bd7b19b2b, as the second commit was just a fix up of the first, recompiled, installed and rebooted to that kernel. I tried to reboot again and sure enough after posting the "machine restart" I started getting those "Press any key to continue." messages again. That's a good sign. Linus mentioned to me to use "reboot=pci" on the kernel command line, but no dice. That doesn't seem to make a difference. I see in the merge commit: Pull x86 reboot changes from Ingo Molnar: "Refine the reboot logic around the CF9 and EFI reboot methods, to make it more robust. The expectation is for no working system to break, and for a couple of reboot-force systems to start rebooting automatically again" Unfortunately, the expectation of no working system to break, didn't quite stand up to expectations :-/ -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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