I pulled up the console on a virtual machine I manage today and was greeted with some kernel messages:
[5912557.130943] Uhhuh. NMI received for unknown reason 20 on CPU 0. [5912557.131115] Do you have a strange power saving mode enabled? [5912557.131287] Dazed and confused, but trying to continue [6064281.393568] Uhhuh. NMI received for unknown reason 30 on CPU 1. [6064281.393888] Do you have a strange power saving mode enabled? [6064281.394235] Dazed and confused, but trying to continue
That's just a few of them, both 20 and 30 occur on CPU 0 and 1.
- VM is Debian Jessie, BIOS boot ("QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014"; kernel 3.16.0-4-amd64)
- Hypervisor is libvirt/KVM running on Debian testing (currently Debian's 4.7.0-1-amd64; qemu 1:2.7+dfsg-3).
- Hardware is an Opteron 6344 on a Supermicro H8SGL-F with ECC RAM with scrub enabled.
I don't see any NMI or EDAC error/warning messages on the host.
Any idea what is causing these NMI messages on the guest? Are they anything to worry about?
(May be related to NMI received for unknown reason 20 — Do you have a strange power saving mode enabled? but that appears to be bare metal).