Tests: test_trampoline_works_with_forks assertions are incomplete #141612
Description
Bug report
Bug description:
The test test_trampoline_works_with_forks in Lib/test/test_perf_profiler.py is incomplete and does not fully validate the correctness of the perf map generation after a fork.
Current Behavior: The test correctly asserts that:
The parent process's symbols (e.g., py::foo, py::bar) are present in the parent's perf-*.map file.
The child process's symbols (e.g., py::foo_fork, py::bar_fork) are present in the child's perf-*.map file.
The Bug: The test fails to check the inverse. It does not assert that:
The child's symbols are absent from the parent's map file.
The parent's symbols are absent from the child's map file.
This is a gap in the test logic, as it could incorrectly pass even if the perf map logic was improperly mixing symbols between the parent and child processes.
CPython versions tested on:
CPython main branch
Operating systems tested on:
No response