We cannot find any logs in var/log related to the failed boots, tried
grepping the kernel version, journalctl --list-boots

** Attachment added: "dmesg after booted with 4.4"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830951/+attachment/5267457/+files/dmesg.log

** Tags added: apport-collected bionic

** Description changed:

  We have a few 2010 mac pro running 1604 LTS that are just upgraded to Ubuntu 
1804 LTS. While they all worked fine with the 1604 LTS and 4.4 kernel, they can 
no longer boot with the 4.15.0-50 kernel installed with 1804.
  We tried various kernel flags without luck, and installed latest 4.18.0-20 
from HWE and got the same result.
  Unfortunately, no logs are created in /var/logs when the issue happens, and 
we could only boot with the old 4.4 kernel. We had to enable earlyprintk=efi to 
get a backtrace in a photo.
  The issue happens consistently, i.e. the backtrace looks always the same just 
happens on different cores.
  Attached the boot-info output and the picture taken at the end of the kernel 
loading.
+ --- 
+ ProblemType: Bug
+ ApportVersion: 2.20.9-0ubuntu7.6
+ Architecture: amd64
+ AudioDevicesInUse:
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC2:  steventang   2047 F.... pulseaudio
+  /dev/snd/controlC0:  steventang   2047 F.... pulseaudio
+  /dev/snd/controlC1:  steventang   2047 F.... pulseaudio
+ CurrentDesktop: ubuntu:GNOME
+ DistroRelease: Ubuntu 18.04
+ HibernationDevice: RESUME=UUID=a7ceb7f0-6040-4236-ad7d-35780a1dc870
+ InstallationDate: Installed on 2019-05-28 (0 days ago)
+ InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
+ MachineType: Apple Inc. MacPro5,1
+ NonfreeKernelModules: wl
+ Package: linux (not installed)
+ ProcFB: 0 radeondrmfb
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-148-generic 
root=UUID=8d18bfd8-303b-4397-9216-a0e48cb6ef54 ro quiet splash
+ ProcVersionSignature: Ubuntu 4.4.0-148.174-generic 4.4.177
+ RelatedPackageVersions:
+  linux-restricted-modules-4.4.0-148-generic N/A
+  linux-backports-modules-4.4.0-148-generic  N/A
+  linux-firmware                             1.173.6
+ Tags:  bionic
+ Uname: Linux 4.4.0-148-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
+ _MarkForUpload: True
+ dmi.bios.date: 08/08/17
+ dmi.bios.vendor: Apple Inc.
+ dmi.bios.version: MP51.88Z.0084.B00.1708080528
+ dmi.board.asset.tag: 0
+ dmi.board.name: Mac-F221BEC8
+ dmi.board.vendor: Apple Inc.
+ dmi.chassis.type: 7
+ dmi.chassis.vendor: Apple Inc.
+ dmi.chassis.version: Mac-F221BEC8
+ dmi.modalias: 
dmi:bvnAppleInc.:bvrMP51.88Z.0084.B00.1708080528:bd08/08/17:svnAppleInc.:pnMacPro5,1:pvr0.0:rvnAppleInc.:rnMac-F221BEC8:rvr:cvnAppleInc.:ct7:cvrMac-F221BEC8:
+ dmi.product.name: MacPro5,1
+ dmi.product.version: 0.0
+ dmi.sys.vendor: Apple Inc.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1830951

Title:
  kernel panic: stack corrupted in efivar_ssdt_iter+0xd3/0xe8

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  We have a few 2010 mac pro running 1604 LTS that are just upgraded to Ubuntu 
1804 LTS. While they all worked fine with the 1604 LTS and 4.4 kernel, they can 
no longer boot with the 4.15.0-50 kernel installed with 1804.
  We tried various kernel flags without luck, and installed latest 4.18.0-20 
from HWE and got the same result.
  Unfortunately, no logs are created in /var/logs when the issue happens, and 
we could only boot with the old 4.4 kernel. We had to enable earlyprintk=efi to 
get a backtrace in a photo.
  The issue happens consistently, i.e. the backtrace looks always the same just 
happens on different cores.
  Attached the boot-info output and the picture taken at the end of the kernel 
loading.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  steventang   2047 F.... pulseaudio
   /dev/snd/controlC0:  steventang   2047 F.... pulseaudio
   /dev/snd/controlC1:  steventang   2047 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=a7ceb7f0-6040-4236-ad7d-35780a1dc870
  InstallationDate: Installed on 2019-05-28 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Apple Inc. MacPro5,1
  NonfreeKernelModules: wl
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-148-generic 
root=UUID=8d18bfd8-303b-4397-9216-a0e48cb6ef54 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-148.174-generic 4.4.177
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-148-generic N/A
   linux-backports-modules-4.4.0-148-generic  N/A
   linux-firmware                             1.173.6
  Tags:  bionic
  Uname: Linux 4.4.0-148-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/08/17
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MP51.88Z.0084.B00.1708080528
  dmi.board.asset.tag: 0
  dmi.board.name: Mac-F221BEC8
  dmi.board.vendor: Apple Inc.
  dmi.chassis.type: 7
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F221BEC8
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMP51.88Z.0084.B00.1708080528:bd08/08/17:svnAppleInc.:pnMacPro5,1:pvr0.0:rvnAppleInc.:rnMac-F221BEC8:rvr:cvnAppleInc.:ct7:cvrMac-F221BEC8:
  dmi.product.name: MacPro5,1
  dmi.product.version: 0.0
  dmi.sys.vendor: Apple Inc.

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