SRU: https://lists.ubuntu.com/archives/kernel-
team/2019-November/105289.html
** Changed in: linux-oem-osp1 (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu Disco)
Status: Confirmed => In Progress
** Description changed:
+ [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-4.15.0-1061 (proposed), system
hangs at very beginning of booting, leaving Grub messages "loading..."
on the console.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-1060-oem 4.15.0-1060.69
ProcVersionSignature: Ubuntu 4.15.0-1060.69-oem 4.15.18
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/controlC0: u 1977 F.... pulseaudio
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=/boot/vmlinuz-4.15.0-1060-oem
root=UUID=baa02b0a-d18f-41d2-9e2b-2d057742013c ro mem_sleep_default=deep
nvidia-drm.modeset=1 quiet splash
RelatedPackageVersions:
linux-restricted-modules-4.15.0-1060-oem N/A
linux-backports-modules-4.15.0-1060-oem N/A
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.:bvr1.12.0:bd06/27/2019:svnDellInc.:pnPrecision5530:pvr:rvnDellInc.:rn0184M4:rvrX00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5530
dmi.sys.vendor: Dell Inc.
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem in Ubuntu.
https://bugs.launchpad.net/bugs/1851216
Title:
System hangs at early boot
Status in linux package in Ubuntu:
Confirmed
Status in linux-oem package in Ubuntu:
Invalid
Status in linux-oem-osp1 package in Ubuntu:
New
Status in linux source package in Bionic:
In Progress
Status in linux-oem source package in Bionic:
In Progress
Status in linux-oem-osp1 source package in Bionic:
In Progress
Status in linux source package in Disco:
In Progress
Status in linux-oem source package in Disco:
New
Status in linux-oem-osp1 source package in Disco:
New
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-4.15.0-1061 (proposed), system
hangs at very beginning of booting, leaving Grub messages "loading..."
on the console.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-1060-oem 4.15.0-1060.69
ProcVersionSignature: Ubuntu 4.15.0-1060.69-oem 4.15.18
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/controlC0: u 1977 F.... pulseaudio
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=/boot/vmlinuz-4.15.0-1060-oem
root=UUID=baa02b0a-d18f-41d2-9e2b-2d057742013c ro mem_sleep_default=deep
nvidia-drm.modeset=1 quiet splash
RelatedPackageVersions:
linux-restricted-modules-4.15.0-1060-oem N/A
linux-backports-modules-4.15.0-1060-oem N/A
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.:bvr1.12.0:bd06/27/2019:svnDellInc.:pnPrecision5530:pvr:rvnDellInc.:rn0184M4:rvrX00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5530
dmi.sys.vendor: Dell Inc.
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