[PATCH] [SRU] [xenial/master-next] [Config] arm64: disable BPF_JIT_ALWAYS_ON
Juerg Haefliger
juerg.haefliger at canonical.com
Mon Apr 16 07:14:28 UTC 2018
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?
...Juerg
> [How to test]
>
> Apply the attached patch, recompile, install and boot.
>
> [Regression potential]
>
> None, since the kernel already fails to boot.
>
> I attached the config change for generic and snapdragon.
>
> Paolo Pisati (1):
> UBUNTU: [Config] arm64: disable BPF_JIT_ALWAYS_ON
>
> debian.master/config/amd64/config.common.amd64 | 1 +
> debian.master/config/arm64/config.common.arm64 | 1 +
> debian.master/config/config.common.ubuntu | 1 -
> debian.master/config/s390x/config.common.s390x | 1 +
> 4 files changed, 3 insertions(+), 1 deletion(-)
>
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