ProcessPoolExecutor subprocesses crash & break pool when raising an exception with keyword-only args and an arg passed to Exception

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
backend

Research direction

Start by running the attached ppe_crash.py reproduction against the affected Python version and observe how ProcessPoolExecutor handles the exception. Then inspect the library code involved in ProcessPoolExecutor subprocess and exception handling; done means the reproduction no longer crashes subprocesses or leaves the pool broken.

Written by the indexing model from the issue text.

Description

3.7 (EOL) stdlib topic-multiprocessing type-bug
BPO 35860
Nosy @underyx
Files
  • ppe_crash.py: Script that triggers the issue on Python 3.7.2
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = None
created_at = <Date 2019-01-30.16:06:56.095>
labels = ['3.7', 'type-bug', 'library']
title = 'ProcessPoolExecutor subprocesses crash & break pool when raising an exception with keyword-only args and an arg passed to Exception'
updated_at = <Date 2019-01-30.16:06:56.095>
user = 'https://github.com/underyx'

    bugs.python.org fields:

    activity = <Date 2019-01-30.16:06:56.095>
actor = 'underyx'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-01-30.16:06:56.095>
creator = 'underyx'
dependencies = []
files = ['48086']
hgrepos = []
issue_num = 35860
keywords = []
message_count = 1.0
messages = ['334570']
nosy_count = 1.0
nosy_names = ['underyx']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35860'
versions = ['Python 3.7']

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