On 01/04/2015 14:26, Andrey Korolyov wrote: > Yes, I disabled host watchdog during runtime. Indeed guest-induced NMI > would look different and they had no reasons to be fired at this stage > inside guest. I`d suspect a hypervisor hardware misbehavior there but > have a very little idea on how APICv behavior (which is completely > microcode-dependent and CPU-dependent but decoupled from peripheral > hardware) may vary at this point, I am using 1.20140913.1 ucode > version from debian if this can matter. Will send trace suggested by > Paolo in a next couple of hours. Also it would be awesome to ask > hardware folks from Intel who can prove or disprove my abovementioned > statement (as I was unable to catch the problem on 2603v2 so far, this > hypothesis has some chance to be real).
Yes, the interaction with the NMI watchdog is unexpected and makes a processor erratum somewhat more likely. Paolo
