Raising an exception that cannot be unpickled causes hang in ProcessPoolExecutor

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
distributed-systems

Research direction

Start at the ProcessPoolExecutor entry point and reproduce the hang with an exception that cannot be unpickled. Trace the worker and result-handling paths, then identify the existing tests for ProcessPoolExecutor; done means the failure no longer hangs and the relevant test coverage passes.

Written by the indexing model from the issue text.

Description

topic-multiprocessing
BPO 24900
Nosy @pitrou, @avassalotti, @agronholm, @serhiy-storchaka

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 2015-08-20.07:21:49.990>
labels = []
title = 'Raising an exception that cannot be unpickled causes hang in ProcessPoolExecutor'
updated_at = <Date 2017-08-30.23:21:01.986>
user = 'https://bugs.python.org/filmor'

bugs.python.org fields:

activity = <Date 2017-08-30.23:21:01.986>
actor = 'pitrou'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2015-08-20.07:21:49.990>
creator = 'filmor'
dependencies = []
files = []
hgrepos = []
issue_num = 24900
keywords = []
message_count = 4.0
messages = ['248878', '248879', '249531', '250385']
nosy_count = 5.0
nosy_names = ['pitrou', 'alexandre.vassalotti', 'filmor', 'alex.gronholm', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue24900'
versions = ['Python 2.7', 'Python 3.2', 'Python 3.3', 'Python 3.4', 'Python 3.5', 'Python 3.6']

Dominant language
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Merged PRs (30d)
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