[Bug 1863759] Re: CPUs stuck during boot after 19.10 upgrade to 5.3.0-40

[Venzislav Ivanov Stefanov]

The same thing with my hardware :

lenovo notebook LENOVO S340-14API / 81NB008ABM

AMD Dual Core R3-3200U Processor, 2.0 GHz (1M Cache, up to 3.5 GHz)
8 GB DDR4
256 GB SSD | М.2 PCIe NVMe (2280)
AMD Radeon Vega 3

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https://bugs.launchpad.net/bugs/1863759

Title:
  CPUs stuck during boot after 19.10 upgrade to 5.3.0-40

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  lsb_release:
  Ubuntu 19.10
  Release 19.10

  Boot process stops at blank screen with .....[76.575608] watchdog:
  BUG: soft lockup - CPU#0 stuck for 23s! [systemd-udev:411]
  [48.523054] watchdog: BUG: soft lockup - CPU#3 stuck for 1s!
  [swapper/3:0]

  
  I rebooted holding the shift key and was able to reboot into 5.3.0-29 which runs with no issues.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15.4
  ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13
  Uname: Linux 5.3.0-29-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Feb 18 08:15:52 2020
  InstallationDate: Installed on 2019-10-29 (111 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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