gh-112536: Add --tsan test for reasonable TSAN execution times.

[corona10]

• Issue: Add support for thread sanitizer (TSAN) via --with-thread-sanitizer #112536

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📚 Documentation preview 📚: https://cpython-previews--116601.org.readthedocs.build/

[corona10]

I am going to update the list of supressions.txt when working on the CI things.

[corona10]

==14799==ThreadSanitizer: starting new threads after multi-threaded fork is not supported. Dying (set die_after_fork=0 to override) 

[corona10]

@colesbury
We may need to decide which tests should be included.

• Successful tests only?
• Add failed tests too but update supressions.txt for this?

[corona10]

We may need to decide which tests should be included.

Anyway, we should exclude some of test from the list since it takes over 1 hours :)

[corona10]

@colesbury@swtaarrs

I think that this setting could be the minimum setup for adding TSAN in CI.
We can add more tests if needed. Here is the local execution result from my Azure VM Ubuntu.
(Standard D4s v3, ubuntu 22.04)
And I recommend not using --with-pydebug. It's super slow, but let's see if it will be an acceptable execution time on GA.
(With separated PR)

$ ./python -m test --tsan --timeout=1200 Using random seed: 1515375220 0:00:00 load avg: 0.79 Run 17 tests in parallel using 6 worker processes (timeout: 20 min, worker timeout: 25 min) 0:00:30 load avg: 2.84 running (6): test_code (30.1 sec), test_enum (30.1 sec), test_functools (30.1 sec), test_httpservers (30.1 sec), test_imaplib (30.0 sec), test_importlib (30.0 sec) 0:00:38 load avg: 3.33 [ 1/17] test_code passed (38.4 sec) -- running (5): test_enum (38.4 sec), test_functools (38.4 sec), test_httpservers (38.4 sec), test_imaplib (38.4 sec), test_importlib (38.4 sec) 0:00:57 load avg: 3.91 [ 2/17] test_functools passed (57.4 sec) -- running (4): test_enum (57.4 sec), test_httpservers (57.4 sec), test_imaplib (57.4 sec), test_importlib (57.4 sec) 0:01:05 load avg: 4.23 [ 3/17] test_imaplib passed (1 min 5 sec) -- running (3): test_enum (1 min 5 sec), test_httpservers (1 min 5 sec), test_importlib (1 min 5 sec) 0:01:36 load avg: 5.06 running (6): test_io (57.2 sec), test_enum (1 min 35 sec), test_logging (38.2 sec), test_httpservers (1 min 35 sec), test_tuple (30.1 sec), test_importlib (1 min 35 sec) 0:01:43 load avg: 5.28 [ 4/17] test_httpservers passed (1 min 43 sec) -- running (5): test_io (1 min 4 sec), test_enum (1 min 43 sec), test_logging (45.8 sec), test_tuple (37.7 sec), test_importlib (1 min 43 sec) 0:02:13 load avg: 5.58 running (6): test_io (1 min 34 sec), test_enum (2 min 13 sec), test_logging (1 min 15 sec), test_list (30.0 sec), test_tuple (1 min 7 sec), test_importlib (2 min 13 sec) 0:02:43 load avg: 5.81 running (6): test_io (2 min 4 sec), test_enum (2 min 43 sec), test_logging (1 min 45 sec), test_list (1 min), test_tuple (1 min 37 sec), test_importlib (2 min 43 sec) 0:03:13 load avg: 5.94 running (6): test_io (2 min 34 sec), test_enum (3 min 13 sec), test_logging (2 min 15 sec), test_list (1 min 30 sec), test_tuple (2 min 7 sec), test_importlib (3 min 13 sec) 0:03:13 load avg: 5.94 [ 5/17] test_tuple passed (2 min 8 sec) -- running (5): test_io (2 min 35 sec), test_enum (3 min 13 sec), test_logging (2 min 16 sec), test_list (1 min 30 sec), test_importlib (3 min 13 sec) 0:03:23 load avg: 5.95 [ 6/17] test_list passed (1 min 39 sec) -- running (4): test_io (2 min 44 sec), test_enum (3 min 22 sec), test_logging (2 min 25 sec), test_importlib (3 min 22 sec) 0:03:53 load avg: 5.95 running (6): test_io (3 min 14 sec), test_enum (3 min 52 sec), test_logging (2 min 55 sec), test_ssl (30.0 sec), test_dict (39.1 sec), test_importlib (3 min 52 sec) 0:04:03 load avg: 6.04 [ 7/17] test_logging passed (3 min 5 sec) -- running (5): test_io (3 min 24 sec), test_enum (4 min 2 sec), test_ssl (40.1 sec), test_dict (49.2 sec), test_importlib (4 min 2 sec) /home/corona10/cpython/Lib/test/test_logging.py:783: DeprecationWarning: This process (pid=63080) is multi-threaded, use of fork() may lead to deadlocks in the child. pid = os.fork() /home/corona10/cpython/Lib/multiprocessing/popen_fork.py:66: DeprecationWarning: This process (pid=63080) is multi-threaded, use of fork() may lead to deadlocks in the child. self.pid = os.fork() 0:04:16 load avg: 5.96 [ 8/17] test_dict passed (1 min 2 sec) -- running (4): test_io (3 min 37 sec), test_enum (4 min 16 sec), test_ssl (53.7 sec), test_importlib (4 min 16 sec) 0:04:39 load avg: 6.41 [ 9/17] test_syslog passed (35.9 sec) -- running (4): test_io (4 min), test_enum (4 min 38 sec), test_ssl (1 min 15 sec), test_importlib (4 min 38 sec) 0:04:57 load avg: 6.47 [10/17] test_thread passed (40.5 sec) -- running (4): test_io (4 min 18 sec), test_enum (4 min 56 sec), test_ssl (1 min 34 sec), test_importlib (4 min 56 sec) 0:05:06 load avg: 6.56 [11/17] test_threadedtempfile passed -- running (4): test_io (4 min 27 sec), test_enum (5 min 6 sec), test_ssl (1 min 43 sec), test_importlib (5 min 6 sec) 0:05:32 load avg: 6.49 [12/17] test_ssl passed (2 min 9 sec) -- running (4): test_io (4 min 53 sec), test_enum (5 min 32 sec), test_threading_local (35.6 sec), test_importlib (5 min 32 sec) 0:05:36 load avg: 6.37 [13/17] test_threadsignals passed -- running (4): test_io (4 min 57 sec), test_enum (5 min 35 sec), test_threading_local (38.9 sec), test_importlib (5 min 35 sec) 0:05:50 load avg: 6.07 [14/17] test_enum passed (5 min 49 sec) -- running (3): test_io (5 min 11 sec), test_threading_local (53.2 sec), test_importlib (5 min 50 sec) 0:05:50 load avg: 6.07 [15/17] test_threading_local passed (53.3 sec) -- running (2): test_io (5 min 11 sec), test_importlib (5 min 50 sec) 0:06:20 load avg: 4.60 running (2): test_io (5 min 41 sec), test_importlib (6 min 20 sec) 0:06:50 load avg: 4.19 running (2): test_io (6 min 11 sec), test_importlib (6 min 50 sec) 0:07:20 load avg: 3.81 running (2): test_io (6 min 41 sec), test_importlib (7 min 20 sec) 0:07:50 load avg: 3.27 running (2): test_io (7 min 11 sec), test_importlib (7 min 50 sec) 0:08:07 load avg: 2.99 [16/17] test_importlib passed (8 min 7 sec) -- running (1): test_io (7 min 28 sec) 0:08:37 load avg: 2.20 running (1): test_io (7 min 58 sec) 0:09:07 load avg: 1.73 running (1): test_io (8 min 28 sec) 0:09:37 load avg: 1.52 running (1): test_io (8 min 58 sec) 0:09:47 load avg: 1.36 [17/17] test_io passed (9 min 8 sec) == Tests result: SUCCESS == All 17 tests OK. Total duration: 9 min 47 sec Total tests: run=4,167 skipped=59 Total test files: run=17/17 Result: SUCCESS 

[swtaarrs]

Can you explain what "TSAN test" means here? From the rest of the diff it sounds like it's "Tests that pass in a reasonable amount of time with TSAN enabled", but that's not clear from this help string.

[colesbury]

I don't think test_tuple uses threads. I don't think it's worthwhile to run tests that don't use threads, because we won't uncover anything new with TSAN.

[corona10]

I got it; I removed more tests that are not using the thread currently.

[corona10]

@swtaarrs It will be the more clear?

[swtaarrs]

Sorry, I completely missed this notification. Looks good to me :)

[colesbury]

This looks like a good start to me. We can build on it (edit the list of tests and suppressions) in the future.

[bedevere-app]

GH-116929 is a backport of this pull request to the 3.12 branch.