On Wed, 24 Sep 2025 14:25:36 +0800
Feng Yang <[email protected]> wrote:
> By the way, during my testing, I also noticed that when executing
> bpf_get_stackid via kprobes or tracepoints,
> the command bpftrace -e 'kprobe:bpf_get_stackid
> {printf("bpf_get_stackid\n");}' produces no output.
I think this is because the bpf_get_stackid is a kind of recursive
event from kprobes. Kprobe handler can not be reentered.
> However, it does output something when bpf_get_stackid is invoked via
> uprobes.
> This phenomenon also occurs on the x86 architecture, could this be a bug as
> well?
Maybe if bpf_get_stackid() is kicked from uprobes, it is not recursive
call from kprobes, so it works.
So it is expected behavior, not a bug. Sorry for confusion.
Thank you,
>
> Thanks.
>
--
Masami Hiramatsu (Google) <[email protected]>
