Public bug reported:

When every I run "sudo sync && sudo shutdown -h now" I experience an
immediate kernel crash.  This is 100% repeatible on my system.

I have the 18.10 release installed with all patches applied.

lsb_release -rd:
Description:Ubuntu 18.10
Release:        18.10

cat /proc/version_signature
Ubuntu 4.18.0-10.11-generic 4.18.12

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: linux-image-4.18.0-10-generic 4.18.0-10.11
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  steves     2854 F.... pulseaudio
 /dev/snd/controlC1:  steves     2854 F.... pulseaudio
Date: Wed Oct 24 22:20:13 2018
HibernationDevice: RESUME=UUID=84b37d15-2872-40b9-b406-0600c9d5f6f5
InstallationDate: Installed on 2018-10-25 (0 days ago)
InstallationMedia:
 
IwConfig:
 lo        no wireless extensions.
 
 enp30s0   no wireless extensions.
Lsusb:
 Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 045e:07b2 Microsoft Corp. 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: System manufacturer System Product Name
ProcEnviron:
 LANGUAGE=
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-10-generic 
root=UUID=05bb8d54-5c84-4752-aeae-a50ab6542e93 ro quiet splash vt.handoff=1
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-4.18.0-10-generic N/A
 linux-backports-modules-4.18.0-10-generic  N/A
 linux-firmware                             1.175
RfKill:
 
SourcePackage: linux
UpgradeStatus: Upgraded to cosmic on 2018-10-25 (0 days ago)
dmi.bios.date: 02/07/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0406
dmi.board.asset.tag: Default string
dmi.board.name: PRIME B350-PLUS
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0406:bd02/07/2017:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEB350-PLUS:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1799875

Title:
  Kernel Crash  - consisten when shutting down the system

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