On Thu, May 08, 2014 at 01:14:56AM -0400, Vince Weaver wrote: > > > > There were a bug in p4 pmu Don (CC'ed) fixed not that long ago but I fear > > not all corner cases might be covered yet. > > I hit the NMI warnings somewhat often on Intel hardware (Haswell, Core2) > but it usually doesn't make the system unusable like it does on p4. > > I can try to get a trace, although I'm not sure it will be useful. I > spent a lot of time getting a reproducible test case for the same warnings > on core2 and it was unclear what the proble was and it was never fixed. > > The messages look like this: > > [ 2944.203423] Uhhuh. NMI received for unknown reason 31 on CPU 0. > [ 2944.208006] Do you have a strange power saving mode enabled? > [ 2944.208006] Dazed and confused, but trying to continue > [ 2944.208006] Uhhuh. NMI received for unknown reason 21 on CPU 0. > [ 2944.208006] Do you have a strange power saving mode enabled? > [ 2944.208006] Dazed and confused, but trying to continue > [ 2944.208006] Uhhuh. NMI received for unknown reason 31 on CPU 0. > [ 2944.208006] Do you have a strange power saving mode enabled? > [ 2944.208006] Dazed and confused, but trying to continue > > repeating forever, system is unusable.
Vince, is it possible to get a trace which exactly events perf-fuzzed pushed into the kernel? Maybe it would shed some light. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
