[New-bugs-announce] [issue31249] test_concurrent_futures leaks dangling threads

[STINNER Victor]

New submission from STINNER Victor:

Using PR 3138 of bpo-31234, I noticed that test_concurrent_futures leaks dangling threads:

haypo at selma$ ./python -u -m test --fail-env-changed test_concurrent_futures -v -m ThreadPoolWaitTests
== CPython 3.7.0a0 (heads/master:0267128, Aug 21 2017, 17:23:11) [GCC 6.4.1 20170727 (Red Hat 6.4.1-1)]
(...)
test_all_completed (test.test_concurrent_futures.ThreadPoolWaitTests) ... Warning -- threading_cleanup() detected 0 leaked threads (count: 0, dangling: 6)
0.11s ok
test_first_completed (test.test_concurrent_futures.ThreadPoolWaitTests) ... 1.60s ok
test_first_completed_some_already_completed (test.test_concurrent_futures.ThreadPoolWaitTests) ... 1.60s ok
test_first_exception (test.test_concurrent_futures.ThreadPoolWaitTests) ... Warning -- threading_cleanup() detected 0 leaked threads (count: 0, dangling: 6)
3.11s ok
test_first_exception_one_already_failed (test.test_concurrent_futures.ThreadPoolWaitTests) ... 2.10s ok
test_first_exception_some_already_complete (test.test_concurrent_futures.ThreadPoolWaitTests) ... Warning -- threading_cleanup() detected 0 leaked threads (count: 0, dangling: 6)
1.60s ok
test_pending_calls_race (test.test_concurrent_futures.ThreadPoolWaitTests) ... 0.12s ok
test_timeout (test.test_concurrent_futures.ThreadPoolWaitTests) ... 6.11s ok
(...)

----------
messages: 300634
nosy: haypo
priority: normal
severity: normal
status: open
title: test_concurrent_futures leaks dangling threads
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31249>
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