On Sun, Oct 12, 2025 at 01:09:31PM +0900, Masami Hiramatsu wrote:

On Wed, 8 Oct 2025 23:08:26 +0200
Jiri Olsa [off-list ref] wrote:

quoted

hi,
I'm getting no stacktrace from bpf program attached on kretprobe.multi probe
(which means on top of return fprobe) on x86.

I think we need some kind of treatment we do for rethook, AFAICS the ORC unwind
stops on return_to_handler, because the stack and the function itself are not
adjusted for unwind_recover_ret_addr call

If it's any help I pushed the bpf/selftest for that in here:
  https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=stacktrace_test

just execute:
  # test_progs -t stacktrace_map/kretprobe_multi

Hmm, curious. as far as we are using fgraph, stacktrace should work.
May this happen if function-graph tracer is enabled too?

that tests is just simple kretprobe so there should be no function-graph
tracer in the way.. I plan to check on this again later this week

jirka