mce errors since latest kernelupdate

[Achim Behrens]

Hi, running 16.04 server on a Dell Poweredge T20. Since latest meltdown/spectre Kernel update i get "mce: [Hardware Error]: Machine check events logged" shown in the logs. This happens when the server is compiling stuff scheduled per cron.

the mce-log shows entries like:
Hardware event. This is not a software error.
MCE 0
CPU 0 BANK 0
TIME 1517991144 Wed Feb 7 09:12:24 2018
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 0 SOCKETID 0
CPUID Vendor Intel Family 6 Model 60

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-112-generic 4.4.0-112.135
ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
Uname: Linux 4.4.0-112-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.4.0-112-generic.
AplayDevices: aplay: device_list:268: no soundcards found...
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
ArecordDevices: arecord: device_list:268: no soundcards found...
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Wed Feb 7 16:49:09 2018
HibernationDevice: RESUME=UUID=9b654b0f-96ef-49f0-bfd8-ad7907cb7b99
InstallationDate: Installed on 2017-05-17 (266 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Dell Inc. PowerEdge T20
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-112-generic root=UUID=9edb2ffb-791e-4988-b3a9-7ce73227802c ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-112-generic N/A
 linux-backports-modules-4.4.0-112-generic N/A
 linux-firmware 1.157.15
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/26/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0VD5HY
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd12/26/2017:svnDellInc.:pnPowerEdgeT20:pvr00:rvnDellInc.:rn0VD5HY:rvrA07:cvnDellInc.:ct6:cvr:
dmi.product.name: PowerEdge T20
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Achim Behrens (k1l)]

Just saw that Dell revoked their A15 Bios Update for the Poweredge T20. So i downgraded to Bios A14 and the /proc/cpuinfo now shows 0x22 as microcode again. It was 0x23 on the revoked BIOS A15.

Looks like the mce errors are gone now on load.

[Launchpad Janitor (janitor)]

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