I can test earlier mainlines, but keep in mind that ppc64el is very slow
on my home qemu setup (note "only" "very slow"; ppc64 is "amazingly
slow", presumably due to endian swapping).  Does Kernel have a POWER8
playground machine, if it comes to bisect compiling?

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  [regression] bionic 4.15.0-13-generic panics on qemu ppc64el

Status in linux package in Ubuntu:
Status in linux source package in Artful:
Status in linux source package in Bionic:

Bug description:
  When upgrading to bionic on a qemu ppc64el instance, the 4.15.0 kernel
  panics before initrd.  Going back to xenial 4.4.0 works correctly.

    Installed: 4.15.0-13.14
    Candidate: 4.15.0-13.14
    Version table:
   *** 4.15.0-13.14 500
          500 http://nibbler.snowman.lan/deb-proxy/ubuntu-ports bionic/main 
ppc64el Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-13-generic 4.15.0-13.14
  ProcVersionSignature: Ubuntu 4.4.0-119.143-generic 4.4.114
  Uname: Linux 4.4.0-119-generic ppc64le
  .var.log.platform: Error: [Errno 13] Permission denied: '/var/log/platform'
   total 0
   crw-rw---- 1 root audio 116,  1 Apr  5 16:11 seq
   crw-rw---- 1 root audio 116, 33 Apr  5 16:11 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: ppc64el
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Thu Apr  5 16:13:28 2018
  HibernationDevice: RESUME=UUID=2e904a57-3ce7-4b31-97ed-6c63b81b2221
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinux-4.4.0-119-generic 
root=UUID=294515c8-75f2-4996-8e4f-a838e6c75804 ro
  ProcLoadAvg: 3.04 2.18 0.92 3/119 1643
   1: POSIX  ADVISORY  WRITE 1225 00:12:470 0 EOF
   2: POSIX  ADVISORY  WRITE 841 00:12:459 0 EOF
   3: FLOCK  ADVISORY  WRITE 832 00:12:449 0 EOF
   4: POSIX  ADVISORY  WRITE 802 00:12:432 0 EOF
   5: POSIX  ADVISORY  WRITE 350 00:12:294 0 EOF
   Filename                             Type            Size    Used    Priority
   /dev/vda3                               partition    1408960 0       -1
  ProcVersion: Linux version 4.4.0-119-generic (buildd@bos02-ppc64el-006) (gcc 
version 5.4.0 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) ) #143-Ubuntu SMP 
Mon Apr 2 16:08:02 UTC 2018
   linux-restricted-modules-4.4.0-119-generic N/A
   linux-backports-modules-4.4.0-119-generic  N/A
   linux-firmware                             1.173
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-04-05 (0 days ago)
  cpu_cores: Number of cores present = 1
  cpu_coreson: Number of cores online = 1
  cpu_smt: Error: command ['ppc64_cpu', '--smt'] failed with exit code 255: 
Machine is not SMT capable

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