sig=0x806ec/20200609, Hard lockups using microcode releases 20191115 on Intel Whiskey Lake

This hangs Linux warm/cold boot for all versions with non-uniformed fail rate. With v5.2 or older, it's almost 100% reproducible; with v5.3 or above, it's much less likely. With kernel boot parameters `initcall_debug ignore_loglevel=1 earlyprintk=efi earlycon=efifb`, it shows it's mostly locked up inside lock access in `console_init()`, but it may also sometimes happen when early console is not even initialized. On Ubuntu Bionic, the first known failing version of intel-microcode package is 3.20191115.1ubuntu0.18.04.1. By reverting this package to any prior revision and such hard lockup is then gone. Another possible temporary work-around is to disable SMP by passing "nosmp" to kernel.

This is currently reproducible on Intel i5-8365U, model 142, stepping 12.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: intel-microcode 3.20191115.1ubuntu0.18.04.2
ProcVersionSignature: Ubuntu 5.0.0-1037.42-oem-osp1 5.0.21
Uname: Linux 5.0.0-1037-oem-osp1 x86_64
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gdm 1229 F.... pulseaudio
                      u 1855 F.... pulseaudio
Date: Tue Feb 11 05:10:57 2020
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-bionic-amd64-20190418-59+beaver-osp1-gilly+X27
InstallationDate: Installed on 2020-02-10 (0 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20190418-12:10
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 0a5c:5843 Broadcom Corp.
 Bus 001 Device 002: ID 0bda:5532 Realtek Semiconductor Corp.
 Bus 001 Device 004: ID 8087:0029 Intel Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Latitude 5410
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-1037-oem-osp1 root=UUID=7b079ce4-5c1d-401e-b847-d2c8b8fc939b ro initcall_debug ignore_loglevel=1 earlyprintk=efi earlycon=efifb nosmp
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-5.0.0-1037-oem-osp1 N/A
 linux-backports-modules-5.0.0-1037-oem-osp1 N/A
 linux-firmware 1.173.14
SourcePackage: intel-microcode
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/29/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 0.0.7
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr0.0.7:bd01/29/2020:svnDellInc.:pnLatitude5410:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
dmi.product.family: Latitude
dmi.product.name: Latitude 5410
dmi.product.sku: 09C9
dmi.sys.vendor: Dell Inc.