test_logging: ResourceWarning: unclosed <socket.socket ...>

[vstinner]

BPO	31235
Nosy	@vstinner
PRs	bpo-31235: Fix ResourceWarning in test_logging #3147 [3.6] bpo-31235: Fix ResourceWarning in test_logging (#3147) #3149

^{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 2017-08-18.23:11:55.984>
created_at = <Date 2017-08-18.21:42:26.458>
labels = ['3.7', 'performance']
title = 'test_logging: ResourceWarning: unclosed <socket.socket ...>'
updated_at = <Date 2017-08-18.23:11:55.983>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2017-08-18.23:11:55.983>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-08-18.23:11:55.984>
closer = 'vstinner'
components = []
creation = <Date 2017-08-18.21:42:26.458>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 31235
keywords = []
message_count = 5.0
messages = ['300534', '300540', '300542', '300546', '300549']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['3147', '3149']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue31235'
versions = ['Python 3.6', 'Python 3.7']

[vstinner]

Sometimes, running test_logging emits such warning:

ResourceWarning: unclosed <socket.socket fd=6, family=AddressFamily.AF_INET, type=536870913, proto=0, laddr=('127.0.0.1', 31191), raddr=('127.0.0.1', 31192)>

I'm not sure where it does come from.

See also bpo-30830 (test_logging leaks dangling threads on FreeBSD).

[vstinner]

Traceback from tracemalloc:

10-STABLE-amd64% ./python -X tracemalloc=10 -m test -v test_logging --fail-env-changed

(...)

/usr/home/haypo/cpython/Lib/test/support/init.py:1515: ResourceWarning: unclosed <socket.socket fd=6, family=AddressFamily.AF_INET, type=536870913, proto=0, laddr=('127.0.0.1', 26785), raddr=('127.0.0.1', 26788)>
gc.collect()
Object allocated at (most recent call first):
File "/usr/home/haypo/cpython/Lib/socket.py", lineno 210
sock = socket(self.family, type, self.proto, fileno=fd)
File "/usr/home/haypo/cpython/Lib/asyncore.py", lineno 348
conn, addr = self.socket.accept()
File "/usr/home/haypo/cpython/Lib/asyncore.py", lineno 492
pair = self.accept()
File "/usr/home/haypo/cpython/Lib/asyncore.py", lineno 417
self.handle_accept()
File "/usr/home/haypo/cpython/Lib/asyncore.py", lineno 83
obj.handle_read_event()
File "/usr/home/haypo/cpython/Lib/asyncore.py", lineno 150
read(obj)
File "/usr/home/haypo/cpython/Lib/asyncore.py", lineno 203
poll_fun(timeout, map)
File "/usr/home/haypo/cpython/Lib/test/test_logging.py", lineno 782
asyncore.loop(poll_interval, map=self._map)
File "/usr/home/haypo/cpython/Lib/threading.py", lineno 865
self._target(*self._args, **self._kwargs)
File "/usr/home/haypo/cpython/Lib/threading.py", lineno 917
self.run()

So it seems like the socket was created in TestSMTPServer.serve_forever() of test_logging, which is used by SMTPHandlerTest.test_basic().

[vstinner]

New changeset a7719e2 by Victor Stinner in branch 'master':
bpo-31235: Fix ResourceWarning in test_logging (bpo-3147)
a7719e2

[vstinner]

Python 2.7 is not affected: it doesn't have SMTPHandlerTest.

[vstinner]

New changeset 3e866df by Victor Stinner in branch '3.6':
bpo-31235: Fix ResourceWarning in test_logging (bpo-3147) (bpo-3149)
3e866df