Public bug reported:

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)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade eoan

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

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

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