warnings.warn_explicit with module_globals=True raises a SystemError

[hawkowl]

BPO	33509
Nosy	@vstinner, @ned-deily, @serhiy-storchaka, @hawkowl, @miss-islington
PRs	bpo-33509: Fix _warnings for module_globals=None #6833 [3.7] bpo-33509: Fix _warnings for module_globals=None (GH-6833) #6870 bpo-33509: Fix test_warnings for python3 -Werror #7365 [3.7] bpo-33509: Fix test_warnings for python3 -Werror (GH-7365) #7384

^{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 = <Date 2018-06-04.20:44:24.857>
created_at = <Date 2018-05-14.21:09:06.413>
labels = ['interpreter-core', '3.7', '3.8', 'type-crash']
title = 'warnings.warn_explicit with module_globals=True raises a SystemError'
updated_at = <Date 2018-06-04.20:44:24.855>
user = 'https://github.com/hawkowl'

bugs.python.org fields:

activity = <Date 2018-06-04.20:44:24.855>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-06-04.20:44:24.857>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2018-05-14.21:09:06.413>
creator = 'hawkowl'
dependencies = []
files = []
hgrepos = []
issue_num = 33509
keywords = ['patch']
message_count = 11.0
messages = ['316578', '316579', '316581', '316586', '316693', '316726', '316801', '318564', '318632', '318682', '318700']
nosy_count = 5.0
nosy_names = ['vstinner', 'ned.deily', 'serhiy.storchaka', 'hawkowl', 'miss-islington']
pr_nums = ['6833', '6870', '7365', '7384']
priority = None
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue33509'
versions = ['Python 3.7', 'Python 3.8']

[hawkowl]

Reproducible with:

import warnings
warnings.warn_explicit("msg", DeprecationWarning, "name", 1, module_globals=None)

[vstinner]

It may be related to:

commit d4f8480
Author: Serhiy Storchaka <storchaka@gmail.com>
Date: Sat Nov 11 15:19:47 2017 +0200

bpo-31572: Don't silence unexpected errors in the _warnings module. (bpo-3731)

Get rid of _PyObject_HasAttrId() and PyDict_GetItemString().
Silence only expected AttributeError, KeyError and ImportError when
get an attribute, look up in a dict or import a module.

[vstinner]

I choose the release blocker priority, since IMHO it's an easy fix.

[serhiy-storchaka]

This bug was before commit d4f8480.

[vstinner]

New changeset b056562 by Victor Stinner in branch 'master':
bpo-33509: Fix _warnings for module_globals=None (bpo-6833)
b056562

[miss-islington]

New changeset 820219f by Miss Islington (bot) in branch '3.7':
bpo-33509: Fix _warnings for module_globals=None (GH-6833)
820219f

[ned-deily]

Thanks for the report and thanks for the fix!

[serhiy-storchaka]

This test is failed with -We.

$ ./python -We -m test -v test_warnings
...

======================================================================
ERROR: test_module_globals (test.test_warnings.CFilterTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/test/test_warnings/__init__.py", line 226, in test_module_globals
    module_globals=None)
UserWarning: msg

======================================================================
ERROR: test_module_globals (test.test_warnings.PyFilterTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/test/test_warnings/__init__.py", line 226, in test_module_globals
    module_globals=None)
  File "/home/serhiy/py/cpython/Lib/warnings.py", line 375, in warn_explicit
    raise message
UserWarning: msg

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