[New-bugs-announce] [issue33725] High Sierra hang when using multi-processing

[Kapil Thangavelu]

New submission from Kapil Thangavelu <kapilt at gmail.com>:

This issue seems to be reported a few times on various githubs projects. I've also reproduced using a brew install of python 2.7.15. I haven't been able to reproduce with python 3.6. Note this requires a framework build of python.

Background on the underlying issue cause due to a change in high Sierra 
http://sealiesoftware.com/blog/archive/2017/6/5/Objective-C_and_fork_in_macOS_1013.html
A ruby perspective on the same issue exhibiting for some apps
https://blog.phusion.nl/2017/10/13/why-ruby-app-servers-break-on-macos-high-sierra-and-what-can-be-done-about-it/


The work around seems to be setting an environment variable OBJC_DISABLE_INITIALIZE_FORK_SAFETY prior to executing python.

Other reports

https://bugs.python.org/issue30837
https://github.com/ansible/ansible/issues/32499
https://github.com/imWildCat/scylla/issues/22
https://github.com/elastic/beats-tester/pull/73
https://github.com/jhaals/ansible-vault/issues/60

----------
components: macOS
messages: 318352
nosy: kapilt, ned.deily, ronaldoussoren
priority: normal
severity: normal
status: open
title: High Sierra hang when using multi-processing
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33725>
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