Public bug reported:

[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.

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

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

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

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