gh-151593: Use timeout on GitHub Action TSan job by vstinner · Pull Request #151594 · python/cpython

vstinner · 2026-06-17T09:47:20Z

Use a timeout of 15 minutes for --tsan command and a timeout of 10 minutes for --tsan-parallel command. Display also the slowest tests to help adjusting these timeouts later if needed.

Issue: test_abc hangs on TSan Parallel Test on Free Threading #151593

Use a timeout of 15 minutes for --tsan command and a timeout of 10 minutes for --tsan-parallel command. Display also the slowest tests to help adjusting these timeouts later if needed.

vstinner · 2026-06-17T09:50:11Z

Example of successful run: https://github.com/python/cpython/actions/runs/27677669151/job/81856939320

--tsan: the slowest test test_concurrent_futures.test_process_pool took 8 min 40 sec
--tsan-parallel: both tests took less than 30 seconds to complete

hugovk · 2026-06-17T10:22:45Z

Currently, from https://github.com/python/cpython/actions/runs/27680332506/job/81865959224?pr=151594#step:9:111:

10 slowest tests:
- test_concurrent_futures.test_process_pool: 8 min 20 sec
- test_concurrent_futures.test_deadlock: 6 min 17 sec
- test_capi: 5 min 40 sec
- test_concurrent_futures.test_shutdown: 4 min 2 sec
- test_free_threading: 3 min 13 sec
- test_embed: 3 min 1 sec
- test_socket: 2 min 55 sec
- test_asyncio.test_tasks: 2 min 35 sec
- test_asyncio.test_events: 2 min 8 sec
- test_threading: 2 min 8 sec

Oh, and parallel hit the 10 minute timeout:

test_abstractmethod_integration (test.test_abc.test_factory.<locals>.TestABC.test_abstractmethod_integration) [threads=4] ... Timeout (0:10:00)!
Thread 0x00007fb4767ff6c0 [test_abstractme] (most recent call first):
File "/home/runner/work/cpython/cpython/Lib/abc.py", line 102 in __init__
File "/home/runner/work/cpython/cpython/Lib/test/test_abc.py", line 207 in C
File "/home/runner/work/cpython/cpython/Lib/test/test_abc.py", line 206 in test_abstractmethod_integration
File "/home/runner/work/cpython/cpython/Lib/contextlib.py", line 116 in inner
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 637 in _callTestMethod
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 691 in run
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/parallel_case.py", line 23 in run_worker
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1160 in run
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1218 in _bootstrap_inner
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1180 in _bootstrap
Thread 0x00007fb4789ff6c0 [test_abstractme] (most recent call first):
File "/home/runner/work/cpython/cpython/Lib/abc.py", line 102 in __init__
File "/home/runner/work/cpython/cpython/Lib/test/test_abc.py", line 207 in C
File "/home/runner/work/cpython/cpython/Lib/test/test_abc.py", line 206 in test_abstractmethod_integration
File "/home/runner/work/cpython/cpython/Lib/contextlib.py", line 116 in inner
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 637 in _callTestMethod
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 691 in run
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/parallel_case.py", line 23 in run_worker
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1160 in run
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1218 in _bootstrap_inner
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1180 in _bootstrap
Thread 0x00007fb47adff6c0 [test_abstractme] (most recent call first):
File "/home/runner/work/cpython/cpython/Lib/abc.py", line 128 in __new__
File "/home/runner/work/cpython/cpython/Lib/test/test_abc.py", line 223 in test_abstractmethod_integration
File "/home/runner/work/cpython/cpython/Lib/contextlib.py", line 116 in inner
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 637 in _callTestMethod
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 691 in run
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/parallel_case.py", line 23 in run_worker
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1160 in run
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1218 in _bootstrap_inner
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1180 in _bootstrap
Thread 0x00007fb479dfe6c0 [test_abstractme] (most recent call first):
File "/home/runner/work/cpython/cpython/Lib/traceback.py", line 316 in clear_frames
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 272 in __exit__
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 244 in handle
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 835 in assertRaises
File "/home/runner/work/cpython/cpython/Lib/test/test_abc.py", line 227 in test_abstractmethod_integration
File "/home/runner/work/cpython/cpython/Lib/contextlib.py", line 116 in inner
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 637 in _callTestMethod
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 691 in run
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/parallel_case.py", line 23 in run_worker
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1160 in run
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1218 in _bootstrap_inner
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1180 in _bootstrap
Thread 0x00007fb4d3b58f40 [python] (most recent call first):
File "/home/runner/work/cpython/cpython/Lib/threading.py", line 1269 in join
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/parallel_case.py", line 54 in run
File "/home/runner/work/cpython/cpython/Lib/unittest/case.py", line 747 in __call__
File "/home/runner/work/cpython/cpython/Lib/unittest/suite.py", line 122 in run
File "/home/runner/work/cpython/cpython/Lib/unittest/suite.py", line 84 in __call__
File "/home/runner/work/cpython/cpython/Lib/unittest/suite.py", line 122 in run
File "/home/runner/work/cpython/cpython/Lib/unittest/suite.py", line 84 in __call__
File "/home/runner/work/cpython/cpython/Lib/unittest/runner.py", line 256 in run
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 84 in _run_suite
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 42 in run_unittest
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 162 in test_func
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 118 in regrtest_runner
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 165 in _load_run_test
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 210 in _runtest_env_changed_exc
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 319 in _runtest
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/single.py", line 348 in run_single_test
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/worker.py", line 99 in worker_process
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/worker.py", line 137 in main
File "/home/runner/work/cpython/cpython/Lib/test/libregrtest/worker.py", line 141 in <module>
File "/home/runner/work/cpython/cpython/Lib/runpy.py", line 87 in _run_code
File "/home/runner/work/cpython/cpython/Lib/runpy.py", line 201 in _run_module_as_main
== Tests result: FAILURE ==
10 slowest tests:
- test_hashlib: 12.4 sec
1 test failed:
test_abc

miss-islington-app · 2026-06-17T11:02:26Z

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15.
🐍🍒⛏🤖

bedevere-app · 2026-06-17T11:02:51Z

GH-151597 is a backport of this pull request to the 3.15 branch.

bedevere-app · 2026-06-17T11:02:56Z

GH-151598 is a backport of this pull request to the 3.14 branch.

…151598) gh-151593: Use timeout on GitHub Action TSan jobs (GH-151594) Use a timeout of 15 minutes for --tsan command and a timeout of 10 minutes for --tsan-parallel command. Display also the slowest tests to help adjusting these timeouts later if needed. (cherry picked from commit 460dec2) Co-authored-by: Victor Stinner <vstinner@python.org>

…151597) gh-151593: Use timeout on GitHub Action TSan jobs (GH-151594) Use a timeout of 15 minutes for --tsan command and a timeout of 10 minutes for --tsan-parallel command. Display also the slowest tests to help adjusting these timeouts later if needed. (cherry picked from commit 460dec2) Co-authored-by: Victor Stinner <vstinner@python.org>

Use a timeout of 15 minutes for --tsan command and a timeout of 10 minutes for --tsan-parallel command. Display also the slowest tests to help adjusting these timeouts later if needed.

pythongh-151593: Use timeout on GitHub Action TSan job
7620302
Use a timeout of 15 minutes for --tsan command and a timeout of 10 minutes for --tsan-parallel command. Display also the slowest tests to help adjusting these timeouts later if needed.

vstinner requested review from AA-Turner, ezio-melotti, hugovk, itamaro and webknjaz as code owners June 17, 2026 09:47

vstinner added needs backport to 3.14 bugs and security fixes needs backport to 3.15 pre-release feature fixes, bugs and security fixes labels Jun 17, 2026

bedevere-appBot added the awaiting core review label Jun 17, 2026

bedevere-appBot mentioned this pull request Jun 17, 2026
test_abc hangs on TSan Parallel Test on Free Threading #151593
Closed

vstinner added the skip news label Jun 17, 2026

hugovk approved these changes Jun 17, 2026
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bedevere-appBot added awaiting merge and removed awaiting core review labels Jun 17, 2026

vstinner merged commit 460dec2 into python:mainJun 17, 2026
99 of 101 checks passed

vstinner deleted the tsan_timeout branch June 17, 2026 11:02

bedevere-appBot removed the awaiting merge label Jun 17, 2026

bedevere-appBot removed the needs backport to 3.15 pre-release feature fixes, bugs and security fixes label Jun 17, 2026

bedevere-appBot removed the needs backport to 3.14 bugs and security fixes label Jun 17, 2026

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gh-151593: Use timeout on GitHub Action TSan job - #151594

gh-151593: Use timeout on GitHub Action TSan job#151594
vstinner merged 1 commit into
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vstinner:tsan_timeout

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