Fix BPF tests failing because use_task_pt_regs_helper defaults to true

[gmarler]

• Fix the tests that fail because use_task_pt_regs_helper defaults to true
• Once those pass, subsequent integration tests fail on RHEL 8.10 - fix those

[gmarler]

Now that those tests pass, the following fail:

failures:

---- test_use_pt_regs_helper stdout ----

thread 'test_use_pt_regs_helper' (190377) panicked at src/bpf_objects.rs:70:66:
load skel: Error: Invalid argument (os error 22)

---- test_do_not_use_pt_regs_helper stdout ----

thread 'test_do_not_use_pt_regs_helper' (190374) panicked at src/bpf_objects.rs:70:66:
load skel: Error: Invalid argument (os error 22)

---- test_integration_ocaml_native_defaults stdout ----

thread 'test_integration_ocaml_native_defaults' (190376) panicked at src/bpf_objects.rs:70:66:
load skel: Error: Invalid argument (os error 22)

---- test_integration stdout ----

thread 'test_integration' (190375) panicked at src/bpf_objects.rs:70:66:
load skel: Error: Invalid argument (os error 22)


failures:
    test_do_not_use_pt_regs_helper
    test_integration
    test_integration_ocaml_native_defaults
    test_use_pt_regs_helper

[gmarler]

With that commit, the integration tests pass again on a live RHEL 8.10 box too.

[javierhonduco]

Why not using ..Profiler::Default() like you did above for the config?

[gmarler]

Oh, that's because here we're not overriding ProfilerConfig::default() (alone) like I did above, but I'm overriding Profiler::default() instead - because that's what the test is using.

And the only way I know of to do that in Rust is not to call Profiler::Default() at all, but to call Profiler::new() with the same ProfilerConfig::default() override as I did above - plus the other arguments Profiler::new() needs.

Am I missing something?

[javierhonduco]

Minor comments, LGTM overall