test_sampling_profiler: test_run_failed_script_live() failed on s390x LTO+PGO build: "Failed to find the PyRuntime section"

s390x Fedora Stable LTO + PGO 3.x: https://buildbot.python.org/#/builders/1627/builds/3165

Previous builds are fine, the error may depend on how PGO decides to optimize the code. I bet that the test will pass on the next build.

Logs:

ERROR: test_run_failed_script_live (test.test_profiling.test_sampling_profiler.test_live_collector_ui.TestLiveModeErrors.test_run_failed_script_live)
Test that running a failing script exits with clean error.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/sample.py", line 87, in __init__
    self.unwinder = self._new_unwinder(native, gc, opcodes, skip_non_matching_threads)
                    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/sample.py", line 102, in _new_unwinder
    return _remote_debugging.RemoteUnwinder(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        self.pid,
        ^^^^^^^^^
    ...<7 lines>...
        **kwargs
        ^^^^^^^^
    )
    ^
RuntimeError: Failed to find the PyRuntime section in process 149156 on Linux platform

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/test/test_profiling/test_sampling_profiler/test_live_collector_ui.py", line 900, in test_run_failed_script_live
    main()
    ~~~~^^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/cli.py", line 989, in main
    _main()
    ~~~~~^^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/cli.py", line 1145, in _main
    handler(args)
    ~~~~~~~^^^^^^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/cli.py", line 1251, in _handle_run
    _handle_live_run(args)
    ~~~~~~~~~~~~~~~~^^^^^^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/cli.py", line 1386, in _handle_live_run
    sample_live(
    ~~~~~~~~~~~^
        process.pid,
        ^^^^^^^^^^^^
    ...<9 lines>...
        blocking=args.blocking,
        ^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/sample.py", line 610, in sample_live
    profiler = SampleProfiler(
        pid,
    ...<8 lines>...
        blocking=blocking,
    )
  File "/var/lib/buildbot/worker/cstratak-fedora-stable-s390x/3.x.cstratak-fedora-stable-s390x.lto-pgo/build/Lib/profiling/sampling/sample.py", line 89, in __init__
    raise SystemExit(err) from err
SystemExit: Failed to find the PyRuntime section in process 149156 on Linux platform

cc @stratakis

Bắt đầu bằng cách chạy test_run_failed_script_live() trong test/test_profiling/test_sampling_profiler/test_live_collector_ui.py trên bản build s390x Fedora Stable LTO+PGO. Theo dõi quá trình khởi tạo SampleProfiler và _new_unwinder() trong Lib/profiling/sampling/sample.py, sử dụng các build log được liên kết làm ngữ cảnh. Hoàn thành khi test xử lý process một cách ổn định và không còn thất bại với “Failed to find the PyRuntime section”.