Public bug reported:

Testing the PTI kernel linux-image-4.4.0-108-generic from
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/pti/ -
doesn't boot.

Stack trace attached.

Variant: xUbuntu 16.04

apport-collect output following. Please note that apport-collect has been ran 
on 4.4.0-104 kernel because 4.4.0-108 did not boot.
---
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC0D3', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', 
'/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', 
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: XFCE
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=ca4bf5a9-f682-4950-ac89-79645b60d402
InstallationDate: Installed on 2016-12-03 (400 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-104-generic 
root=UUID=ce50bd8c-c3fd-4582-9018-61d2f50157c6 ro quiet splash
ProcVersionSignature: Ubuntu 4.4.0-104.127-generic 4.4.98
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-104-generic N/A
 linux-backports-modules-4.4.0-104-generic  N/A
 linux-firmware                             1.157.14
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
Tags:  xenial
Uname: Linux 4.4.0-104-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker libvirtd lpadmin plugdev sambashare sudo 
wireshark
_MarkForUpload: True
dmi.bios.date: 07/12/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.10
dmi.board.name: Z77 Pro3
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP2.10:bd07/12/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ77Pro3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

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


** Tags: apport-collected xenial

** Attachment added: "Photo of stack trace"
   
https://bugs.launchpad.net/bugs/1741869/+attachment/5032688/+files/IMG_20180108_104845.jpg

** Tags added: apport-collected xenial

** Description changed:

  Testing the PTI kernel linux-image-4.4.0-108-generic from
  https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/pti/ -
  doesn't boot.
  
  Stack trace attached.
  
  Variant: xUbuntu 16.04
  
  apport-collect output following.
+ --- 
+ ApportVersion: 2.20.1-0ubuntu2.15
+ Architecture: amd64
+ AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC0D3', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', 
'/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', 
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
+ CurrentDesktop: XFCE
+ DistroRelease: Ubuntu 16.04
+ HibernationDevice: RESUME=UUID=ca4bf5a9-f682-4950-ac89-79645b60d402
+ InstallationDate: Installed on 2016-12-03 (400 days ago)
+ InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
+ MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
+ NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
+ Package: linux (not installed)
+ ProcFB: 0 inteldrmfb
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-104-generic 
root=UUID=ce50bd8c-c3fd-4582-9018-61d2f50157c6 ro quiet splash
+ ProcVersionSignature: Ubuntu 4.4.0-104.127-generic 4.4.98
+ RelatedPackageVersions:
+  linux-restricted-modules-4.4.0-104-generic N/A
+  linux-backports-modules-4.4.0-104-generic  N/A
+  linux-firmware                             1.157.14
+ RfKill:
+  0: phy0: Wireless LAN
+       Soft blocked: no
+       Hard blocked: no
+ Tags:  xenial
+ Uname: Linux 4.4.0-104-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm cdrom dip docker libvirtd lpadmin plugdev sambashare sudo 
wireshark
+ _MarkForUpload: True
+ dmi.bios.date: 07/12/2013
+ dmi.bios.vendor: American Megatrends Inc.
+ dmi.bios.version: P2.10
+ dmi.board.name: Z77 Pro3
+ dmi.board.vendor: ASRock
+ dmi.chassis.asset.tag: To Be Filled By O.E.M.
+ dmi.chassis.type: 3
+ dmi.chassis.vendor: To Be Filled By O.E.M.
+ dmi.chassis.version: To Be Filled By O.E.M.
+ dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP2.10:bd07/12/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ77Pro3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
+ dmi.product.name: To Be Filled By O.E.M.
+ dmi.product.version: To Be Filled By O.E.M.
+ dmi.sys.vendor: To Be Filled By O.E.M.

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https://bugs.launchpad.net/bugs/1741869

Title:
  PTI kernel doesn't boot

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