Public bug reported:
Basically a null pointer dereference was happening while using a lenovo
usb-c dock. The issue has been addressed upstream with commit:
https://github.com/torvalds/linux/commit/386e15a650447f53de3d2d8819ce9393f31650a4
Apparently the dock kept sending altmode information repeatedly, and the
kernel did not expect this to happen, a check was added to make sure it
only observes the amount of altmodes limited by the standard.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.4.0-48-generic 5.4.0-48.52~18.04.1
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 30 15:40:24 2020
InstallationDate: Installed on 2020-09-30 (0 days ago)
InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64
(20200806.1)
SourcePackage: linux-signed-hwe-5.4
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-5.4 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic kernel-bug
** Attachment added: "dmesg output"
https://bugs.launchpad.net/bugs/1897963/+attachment/5415808/+files/20200824_125712.jpg
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https://bugs.launchpad.net/bugs/1897963
Title:
Kernel null pointer dereference - Lenovo Thinkpad USB-C Dock Gen2
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