Messages in this thread | | | Date | Thu, 31 Jan 2013 09:28:12 +0100 | From | Jiri Slaby <> | Subject | Re: Uhhuh. NMI received for unknown reason 2c on CPU 0. |
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On 01/31/2013 08:09 AM, Borislav Petkov wrote: > On Thu, Jan 31, 2013 at 01:54:56AM +0100, Rafael J. Wysocki wrote: >> On Thursday, January 31, 2013 12:47:40 AM Jiri Slaby wrote: >>> On 01/31/2013 12:12 AM, Jiri Slaby wrote: >>>> I think I will start with commenting parts of `power' script to see >>>> exactly which of the power savings cause this. >>> >>> ... NMI watchdog. If I remove it from the script, the problem >>> disappears. If I try it alone, I have those NMIs. >> >> Well, beats me. :-( >> >> I suspect that it doesn't quiesce itself sufficiently before image restoration >> and we get some crosstalk between the boot kernel and the image kernel. > > Well, I did what Jiri said causes it: > > echo 0 > /proc/sys/kernel/nmi_watchdog > > No NMI. > > BUT(!), if I start powertop and set all tunables in the "Tunables" tab > to "Good", then suspend to disk, when I resume I get the NMI and this > time the unknown reason is 0x3c. Sounds like this needs bisection...
And, does it happen if you switch all of them but NMI wtd in there?
And if I pass nmi_watchdog=0 to the image kernel, it should be gone I guess.
-- js suse labs
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