** Also affects: linux-snapdragon (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux-snapdragon (Ubuntu Xenial)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1763644

Title:
  Ubuntu-4.4.0-120.144 fails to boot on arm64* hardware

Status in linux package in Ubuntu:
  Incomplete
Status in linux-snapdragon package in Ubuntu:
  New
Status in linux source package in Xenial:
  In Progress
Status in linux-snapdragon source package in Xenial:
  In Progress

Bug description:
  [Impact]

  The Ubuntu-4.4.0-120.144 kernel (now in -proposed) fails to boot on
  all arm64 hardware: no console output or any other sign of activity,
  the system freeze just after the bootloader loads vmlinuz, and jumps
  to it.

  We first experienced it on the snapdragon kernel snap in -beta
  (dragonboard 410c) but the bug is arm64 generic, and it affects all
  the arm64 hardware: a thunderx board shows the same exact symptoms.

  The regression came down as part of the 4.4.115 stable update
  ("79e83d1 bpf: introduce BPF_JIT_ALWAYS_ON config") and enabled this
  option that crashes the arm64 kernel on boot.

  
  [How to test]

  Apply the attached patch, recompile, install and boot.

  [Regression potential]

  None, since the kernel already fails to boot.

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