* Queue "bpf: Size backward jumps by the insns they jump over" for stable
[not found] <20261022-jit_size_fix-v2-0-4bee6921b218@meta.com>
@ 2026-10-29 22:23 ` Shang En Sim
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From: Shang En Sim @ 2026-10-29 22:23 UTC (permalink / raw)
To: Alexei Starovoitov, Daniel Borkmann
Cc: Shang En Sim, bpf, netdev, Mykyta Yatsenko
Hi,
Could you queue this fix for stable?
commit ebf0ab370bcdcd17f4faa204e1d2cc8e817ca6b1
bpf: Size backward jumps by the insns they jump over
It fixes the x86 JIT stopping its sizing passes before jumps converge, which
makes a valid program fail to load with -ENOTSUPP and "bpf_jit: fatal error".
I reproduced the failure on 6.18.59 (CONFIG_BPF_JIT_ALWAYS_ON=y) with the
selftest program from a938f51d3522: the load fails with errno 524 and
"bpf_jit: fatal error" in dmesg, and the same program loads with the fix
applied.
Thanks,
Shang En Sim
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