Re: [PATCH RFC bpf-next 0/2] bpf: Do not let preemption cause false recursion drops in trampoline progs

[Alexei Starovoitov]

On Sun, Oct 25, 2026 at 04:02 AM Mike Bazov via B4 Relay <devnull+mikeba.sentinelone.com@xxxxxxxxxx> wrote:

> Is disabling preemption in __bpf_prog_enter_recur() on !PREEMPT_RT the
> preferred fix for fentry/fexit, or would you prefer a different
> mechanism for reconciling preemptible execution with prog->active and
> the per-CPU private stack?

No.
We cannot disable preemption, since progs are not short
with may_goto they can take 1/4 sec.

Sounds like private stack is the culprit.
Should we disable it?

pw-bot: cr