Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: Uhhuh. NMI received for unknown reason 2c on CPU 0. | Date | Thu, 31 Jan 2013 14:29:53 +0100 |
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On Thursday, January 31, 2013 02:18:05 PM Borislav Petkov wrote: > On Thu, Jan 31, 2013 at 09:28:12AM +0100, Jiri Slaby wrote: > > And, does it happen if you switch all of them but NMI wtd in there? > > No, but something else happens. Here's the whole dance: > > 1. Switch all tunables except "NMI watchdog should be turned off" to "Good" > 2. suspend to disk > 3. resume... all good > 4. switch "NMI watchdog should be turned off" to "Good" > 5. suspend to disk > 6. resume... all good > 7. start powertop, toggle "Wireless Power Saving for interface wlan0" twice. > I.e., "Good" -> "Bad"; "Bad" -> "Good". > > -> Boom! Unknown reason NMI. It happened right during the toggle because > it appeared in the framebuffer console (no X) right during me toggling > this. > > So, it is something getting fishy *after* the watchdog gets disabled. > Something remains funny and dangling, causing it to fire an NMI because > it is an NMI watchdog (doh!)... Could it be that the watchdog_disable > fact doesn't get communicated to the image kernel somehow, or maybe > delayed?
The image kernel has no idea whether or not the watchdog has been disabled in the boot kernel. It needs to be disabled in both.
> > > And if I pass nmi_watchdog=0 to the image kernel, it should be gone I > > guess. > > How do you pass options the image kernel?
The image kernel has the same set of command line options that was used by that kernel before hibernation.
Thanks, Rafael
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.
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