Public bug reported:

Afraid not much to add, this occurred after rebooting the laptop.

ProblemType: KernelOops
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-13-generic 4.15.0-13.14
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
Annotation: Your system might become unstable now and might need to be 
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
 /dev/snd/controlC0:  gdm        1156 F.... pulseaudio
                      calum      2981 F.... pulseaudio
Date: Wed Apr 11 22:14:58 2018
DuplicateSignature: BUG: unable to handle kernel NULL pointer dereference at 
location RIP: timecounter_read+0x10/0x60 RSP: ffffb2b88116be08
Failure: oops
InstallationDate: Installed on 2017-10-20 (173 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
MachineType: LENOVO 20JDCTO1WW
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic.efi.signed 
root=UUID=4f03289b-2cac-4bfb-bc59-47e041629a44 ro quiet splash 
resume=UUID=4f03289b-2cac-4bfb-bc59-47e041629a44 resume_offset=757760 
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions: kerneloops-daemon N/A
SourcePackage: linux
Title: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
UpgradeStatus: Upgraded to bionic on 2018-04-11 (0 days ago) 12/14/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1NET34W (1.21 )
dmi.board.asset.tag: Not Available 20JDCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi:bvnLENOVO:bvrN1NET34W(1.21):bd12/14/2017:svnLENOVO:pn20JDCTO1WW:pvrThinkPadX1Yoga2nd:rvnLENOVO:rn20JDCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct31:cvrNone: ThinkPad X1 Yoga 2nd 20JDCTO1WW
dmi.product.version: ThinkPad X1 Yoga 2nd
dmi.sys.vendor: LENOVO

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

** Tags: amd64 apport-kerneloops bionic kernel-oops

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  BUG: unable to handle kernel NULL pointer dereference at

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