Univention Bugzilla – Bug 52749
NMI received for unknown reason 20 on CPU 0.
Last modified: 2021-04-29 11:27:01 CEST
My UCS 5 primary is printing these messages every 30 seconds: Message from syslogd@primary150 at Feb 5 17:03:37 ... kernel:[ 1069.210358] Uhhuh. NMI received for unknown reason 20 on CPU 0. Message from syslogd@primary150 at Feb 5 17:03:37 ... kernel:[ 1069.210360] Do you have a strange power saving mode enabled? Message from syslogd@primary150 at Feb 5 17:03:37 ... kernel:[ 1069.210360] Dazed and confused, but trying to continue Message from syslogd@primary150 at Feb 5 17:04:07 ... kernel:[ 1099.210713] Uhhuh. NMI received for unknown reason 20 on CPU 0. Message from syslogd@primary150 at Feb 5 17:04:07 ... kernel:[ 1099.210715] Do you have a strange power saving mode enabled? Message from syslogd@primary150 at Feb 5 17:04:07 ... kernel:[ 1099.210715] Dazed and confused, but trying to continue Message from syslogd@primary150 at Feb 5 17:04:37 ... kernel:[ 1129.211108] Uhhuh. NMI received for unknown reason 00 on CPU 0. Message from syslogd@primary150 at Feb 5 17:04:37 ... kernel:[ 1129.211110] Do you have a strange power saving mode enabled? Message from syslogd@primary150 at Feb 5 17:04:37 ... kernel:[ 1129.211111] Dazed and confused, but trying to continue
This might be a bug in out 5.0-0+2020-12-15_generic-unsafe_amd64 template, which uses `q35` but is missing /domain/features/apic/@eoi="on". https://unix.stackexchange.com/questions/216925/nmi-received-for-unknown-reason-20-do-you-have-a-strange-power-saving-mode-ena
(In reply to Philipp Hahn from comment #1) > This might be a bug in out 5.0-0+2020-12-15_generic-unsafe_amd64 template, > which uses `q35` but is missing /domain/features/apic/@eoi="on". This never fixed it for me, only temporarily. Further searching revealed <https://qemu-devel.nongnu.narkive.com/TCZgR67N/patch-hw-acpi-tco-c-fix-tco-timer-stop>, which is a bug in the Qemu Q35 model not resetting the "iTCO_wdt" (Intel Total Cost of Ownership WatchDog Timer) Fix === Probably fixed by v2.9.0-rc0~56^2~1 and v2.9.0-rc4~11^2 in-top, while Debian-9-Stretch = UCS-4.4 only has 2.8 ``` ucr set kernel/blacklist='nouveau;iTCO_wdt' ``` Links ===== * <https://unix.stackexchange.com/questions/327192/unknown-nmi-reason-20-and-30-on-a-vm/647254#647254> * <http://xen1.knut.univention.de:8000/packages/source/qemu/>