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[Po-Hsu Lin <1922997@xxxxxxxxxxxxxxxxxx>]

Manually deployed it and upgrade to -142, it works as expected.

** Changed in: ubuntu-kernel-tests
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1922997

Title:
  P8 node entei unable to boot with 4.15.0-141.145~16.04.1

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux-hwe package in Ubuntu:
  Invalid
Status in linux-hwe source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  Enabling CONFIG_MODVERSIONS on xenial/linux-hwe (via rebase on bionic/linux, see bug 1898716) is causing the kernel to fail booting on ppc64el as the modules can't be loaded because of the mismatch of the module_layout symbol.

  [    7.635173] raid0: disagrees about version of symbol module_layout

  [Fix]
  The proposed fix is to disable CONFIG_MODVERSIONS and unset CONFIG_SYSTEM_TRUSTED_KEYS via the 'local-mangle' script which gets called by the 'open' script after the rebase. Making the changes directly on the config or annotations file is not persistent as these files are synced from master.

  This is a temporary fix until the root cause can be found.

  [Test case]
  Boot the kernel on a xenial ppc64el system.

  [Regression potential]
  This config option has been enabled on Bionic to support rebuilding the lrm modules without the need to rebuild the kernel. There are no lrm modules in Xenial, so it should be safe to keep it disabled.

  [Original Description]

  Tested manually, this node can boot with 4.15.0-140-generic

  However with 4.15.0-141.145~16.04.1 in proposed, it will drop into
  initramfs:

  [    9.547985] usb 1-3.4: Manufacturer: American Megatrends Inc.
  [    9.563800] hid: disagrees about version of symbol module_layout
  [    9.563949] hid: disagrees about version of symbol module_layout
  [    9.692066] libcrc32c: disagrees about version of symbol module_layout
  [   12.593593] raid10: disagrees about version of symbol module_layout
  done.
  Begin: Running /scripts/init-premount ... done.
  Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
  Begin: Running /scripts/local-premount ... [   12.963251] raid6_pq: disagrees about version of symbol module_layout
  done.
  Begin: Waiting for root file system ... Begin: Running /scripts/local-block ... mdadm: CREATE group disk not found
  mdadm: No devices listed in conf file were found.
  done.
  Begin: Running /scripts/local-block ... mdadm: CREATE group disk not found
  mdadm: No devices listed in conf file were found.
  done.
  (this mdadm message repeats)
  Gave up waiting for root device.  Common problems:
   - Boot args (cat /proc/cmdline)
     - Check rootdelay= (did the system wait long enough?)
     - Check root= (did the system wait for the right device?)
   - Missing modules (cat /proc/modules; ls /dev)
  ALERT!  UUID=348b5e78-915d-47b0-93db-3eca0d8f048e does not exist.  Dropping to a shell!
  [  204.831089] hid: disagrees about version of symbol module_layout

  BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1.4) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  (initramfs)

  Please find attachment for the boot log.

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