forkserver.set_forkserver_preload() silent preload import failures when sys.path is required #117378
Description
Bug report
Bug description:
Bug in def main(): https://github.com/python/cpython/blob/main/Lib/multiprocessing/forkserver.py#L167
The param sys_path is ignored. Result: ModuleNotFoundError for preloaded modules.
a) Using sys_path fixes this issue
b) Maybe better remove "pass" and report and error to simplify problem solving
if preload: if '__main__' in preload and main_path is not None: process.current_process()._inheriting = True try: spawn.import_main_path(main_path) finally: del process.current_process()._inheriting + if sys_path: + sys.path = sys_path for modname in preload: try: __import__(modname) except ImportError: - pass + warnings.warn('forkserver: preloading module failed %s' % modname)CPython versions tested on:
3.12
Operating systems tested on:
No response
Linked PRs
- gh-117378: Fix multiprocessing forkserver preload sys.path inheritance. #126538
- [3.13] gh-117378: Fix multiprocessing forkserver preload sys.path inheritance. (GH-126538) #126632
- [3.12] gh-117378: Fix multiprocessing forkserver preload sys.path inheritance. (GH-126538) #126633
- gh-117378: Clear up the NEWS entry wording #126634
- gh-117378: Only run the new multiprocessing SysPath test when appropriate #126635
- [3.13] gh-117378: Only run the new multiprocessing SysPath test when appropriate (GH-126635) #126652
- [3.12] gh-117378: Only run the new multiprocessing SysPath test when appropriate (GH-126635) #126653
- [3.13] gh-117378: Clear up the NEWS entry wording (GH-126634) #126668
- [3.12] gh-117378: Clear up the NEWS entry wording (GH-126634) #126669
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