System hangs at early boot
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Undecided
|
Unassigned | ||
Bionic |
Fix Released
|
High
|
Unassigned | ||
Disco |
Fix Released
|
High
|
Unassigned | ||
linux-oem (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bionic |
Fix Released
|
Undecided
|
You-Sheng Yang | ||
Disco |
Fix Released
|
Undecided
|
Unassigned | ||
linux-oem-osp1 (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Bionic |
Fix Released
|
Undecided
|
Unassigned | ||
Disco |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
[SRU Justification]
[Impact]
Some recent platform seem to have an unstable HPET, which is used to
calibrate TSC but turns out to mark an actual stable TSC clocksource as
unstable, and then fallback to that unstable HPET as main clocksource. A
previous fix was proposed in bug 1840239, which is then observed to hang
platforms with modern chipsets including Skylake and ApolloLake at early
boot stage when HPET is disabled.
[Fix]
Commit c8c4076723da "x86/timer: Skip PIT initialization on modern chipsets"
included in v5.3-rc1 to be backported.
[Test Case]
Boot with kernel built with this change, and see if it will hang right
after grub loaded initramfs image.
[Regression Risk]
Low. This change detects the hardware that requires explicit PIT
initialization skip and skip it. For those unaffected systems, they
remain unaffected.
========== original description =========
After upgrading kernel to linux-image-
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-
ProcVersionSign
Uname: Linux 4.15.0-1060-oem x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC1D0c: u 1977 F...m pulseaudio
/dev/snd/pcmC1D0p: u 1977 F...m pulseaudio
/dev/snd/
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 4 17:15:56 2019
InstallationDate: Installed on 2019-11-04 (0 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38
MachineType: Dell Inc. Precision 5530
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.173.9
SourcePackage: linux-oem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/27/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.12.0
dmi.board.name: 0184M4
dmi.board.vendor: Dell Inc.
dmi.board.version: X00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.
dmi.product.family: Precision
dmi.product.name: Precision 5530
dmi.sys.vendor: Dell Inc.
CVE References
description: | updated |
Changed in linux-oem (Ubuntu Bionic): | |
status: | New → Confirmed |
Changed in linux-oem (Ubuntu): | |
status: | Confirmed → Invalid |
Changed in linux-oem (Ubuntu Bionic): | |
assignee: | nobody → You-Sheng Yang (vicamo) |
Changed in linux-oem (Ubuntu Bionic): | |
status: | In Progress → Fix Committed |
Changed in linux-oem (Ubuntu Disco): | |
status: | New → Invalid |
Changed in linux (Ubuntu Bionic): | |
importance: | Undecided → High |
Changed in linux (Ubuntu Disco): | |
importance: | Undecided → High |
Changed in linux-oem-osp1 (Ubuntu): | |
status: | New → Invalid |
Changed in linux-oem-osp1 (Ubuntu Disco): | |
status: | New → Invalid |
Changed in linux (Ubuntu Disco): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Bionic): | |
status: | In Progress → Fix Committed |
tags: |
added: verification-done-bionic verification-done-disco removed: verification-needed-bionic verification-needed-disco |
Changed in linux (Ubuntu): | |
status: | Confirmed → Invalid |
One of the patches landed to linux-oem in bug 1840239 caused this regression:
* 2638cd5fdb725 UBUNTU: SAUCE: x86/intel: Disable HPET on Intel Ice Lake platforms
* f90d773ee5b98 UBUNTU: SAUCE: x86/intel: Disable HPET on Intel Coffe Lake platforms