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On Ubuntu 16.04.3 , I upgraded Kernel 4.13.0-31.34 , which includes specter and 
meltdown fixes. After Upgrade when I was going to start VM in virtualbox System 
is getting freezes. Reboot required to resume system. I faced 4 times. I 
rollback to kernel 4.10.0-42. Now I am able to start vm perfectly. Please look 
into this kernel issue.
--- 
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ketankumar.patel   2098 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=2a3a4447-c93a-46fc-96e9-56023bb774f8
InstallationDate: Installed on 2017-09-11 (139 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
JournalErrors:
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] 
failed with exit code 1: Hint: You are currently not seeing messages from other 
users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
MachineType: LENOVO 20FL000FMS
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-42-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.10.0-42.46~16.04.1-generic 4.10.17
RelatedPackageVersions:
 linux-restricted-modules-4.10.0-42-generic N/A
 linux-backports-modules-4.10.0-42-generic  N/A
 linux-firmware                             1.157.14
Tags:  xenial
Uname: Linux 4.10.0-42-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: docker
WifiSyslog:
 
_MarkForUpload: True
dmi.bios.date: 02/10/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1KET30W (1.17 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FL000FMS
dmi.board.vendor: LENOVO
dmi.board.version: 0B98417 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN1KET30W(1.17):bd02/10/2017:svnLENOVO:pn20FL000FMS:pvrThinkPadP50s:rvnLENOVO:rn20FL000FMS:rvr0B98417WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20FL000FMS
dmi.product.version: ThinkPad P50s
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: High
         Status: New


** Tags: apport-collected xenial
-- 
System Freezes while starting VM in virtualbox after Kernrel Upgrade 
4.13.0-31.34 
https://bugs.launchpad.net/bugs/1745938
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