[PATCH] [SRU] [xenial/master-next] [Config] arm64: disable BPF_JIT_ALWAYS_ON

Paolo Pisati paolo.pisati at canonical.com
Mon Apr 16 15:57:23 UTC 2018

On Mon, Apr 16, 2018 at 9:14 AM, Juerg Haefliger
<juerg.haefliger at canonical.com> wrote:
> On 04/13/2018 11:41 AM, Paolo Pisati wrote:
>> BugLink: https://bugs.launchpad.net/bugs/1763644
>> [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 freezes
>> right 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.
> Is upstream aware of this problem?

No, because the vanilla arm64 defconfig doesn't trigger it: so it's
either some patch we carry in -generic, or our ubuntu config, and i'm
still trying to figure it out.


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