Just ran across this bug in LP. Note: 60c8144afc28 is only masking what the real issue is; it's a real bug, but the reason it's getting hit at all in this specific instance is because of an AMD CPU erratum which is causing spurious MCEs early enough to hit the bug this commit fixes.
However, while the crash is fixed, the thresholding interrupts are still going to be coming in fast and furious, better to disable them on affected CPUs as fixed by the following: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=45d4b7b9cb88526f6d5bd4c03efab88d75d10e4f https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71a84402b93e5fbd8f817f40059c137e10171788 If the above 2 commits are in place, 60c8144afc28 becomes less critical, as you should no longer hit that condition. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1796443 Title: HP EliteBook 745 G5 (Ryzen 2500U) fails to boot unless `mce=off` is set on command line Status in Linux: Fix Released Status in linux package in Ubuntu: Confirmed Bug description: My new Elitebook, with the latest bios 1.03.01, refuses to boot any kernel later than 4.10 unless mce=off is appended to the kernel command line. As in, there are no kernel messages at all after grub (yes, quiet and splash were removed from the command line). Perhaps it crashes before the efifb kicks in? System operates fine if mce=off is added to the kernel command line (and iommu=soft, but that's a separate issue, and fails with kernel output in that case). I opened upstream bug here : https://bugzilla.kernel.org/show_bug.cgi?id=201291 I bisected the problem down to this commit (and the few before it, which also added extra MCE output, but didn't actually crash): 18807ddb7f88d4ac3797302bafb18143d573e66f is the first bad commit commit 18807ddb7f88d4ac3797302bafb18143d573e66f Author: Yazen Ghannam <yazen.ghan...@amd.com> Date: Tue Nov 15 15:13:53 2016 -0600 x86/mce/AMD: Reset Threshold Limit after logging error The error count field in MCA_MISC does not get reset by hardware when the threshold has been reached. Software is expected to reset it. Currently, the threshold limit only gets reset during init or when a user writes to sysfs. If the user is not monitoring threshold interrupts and resetting the limit then the user will only see 1 interrupt when the limit is first hit. So if, for example, the limit is set to 10 then only 1 interrupt will be recorded after 10 errors even if 100 errors have occurred. The user may then assume that only 10 errors have occurred. There are threads online about this being related to the latest bios. The upstream bug has acpidump attached. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-8-generic 4.18.0-8.9 ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7 Uname: Linux 4.18.0-8-generic x86_64 ApportVersion: 2.20.10-0ubuntu11 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: john 2015 F.... pulseaudio /dev/snd/pcmC1D0p: john 2015 F...m pulseaudio /dev/snd/controlC0: john 2015 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Fri Oct 5 23:24:45 2018 InstallationDate: Installed on 2018-09-30 (5 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20180927) Lsusb: Bus 005 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: HP HP EliteBook 745 G5 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-8-generic root=UUID=5cf73665-d2a3-4203-80fd-659faf1afea4 ro quiet splash iommu=soft mce=off RelatedPackageVersions: linux-restricted-modules-4.18.0-8-generic N/A linux-backports-modules-4.18.0-8-generic N/A linux-firmware 1.175 RfKill: 1: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux StagingDrivers: r8822be UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/26/2018 dmi.bios.vendor: HP dmi.bios.version: Q81 Ver. 01.03.01 dmi.board.name: 83D5 dmi.board.vendor: HP dmi.board.version: KBC Version 08.47.00 dmi.chassis.asset.tag: 5CG838305Y dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrQ81Ver.01.03.01:bd07/26/2018:svnHP:pnHPEliteBook745G5:pvr:rvnHP:rn83D5:rvrKBCVersion08.47.00:cvnHP:ct10:cvr: dmi.product.family: 103C_5336AN HP EliteBook dmi.product.name: HP EliteBook 745 G5 dmi.product.sku: 2MG23AV dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1796443/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
