GeezerVison

@ericsnowcurrently: this works nice for a single test run, but obviously fails if we're running ref-leak tests (the reload reinitializes the singletons in the global state).

One way to fix reloading is to use an initialization guard.

thank you for doing this!

@ericsnowcurrently @erlend-aasland Are we sure this won't segfault in the case I described in #117398 (comment) ? (acquire a capsule reference, reload the module, use the capsule with the reloaded module)

The addition of the no_rerun guard on the C API test case makes me more concerned about that risk than I already was.

This is an incomplete first step of a series of multiple PRs. Eric and I propose to handle the encapsulated C API last. The scenario you describe will probably segfault for now.

FTR, the test guard was added because running with test -R : leaks.

Actually, the scenario you are describing is what happens when you do a ref-leak run of the C API test: the _testcapimodule reuses the pointer to the encapsulted C API, but the _datetime module is reloaded (and its exec function is run) every time. I didn't check coverage (yet), but so far this only causes leaks.

GH-119636 is a backport of this pull request to the 3.13 branch.

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1491/builds/93) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1491/builds/93

Failed tests:

• test_datetime
• test.test_concurrent_futures.test_process_pool

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/threading.py", line 1039, in _bootstrap_inner
    self.run()
    ~~~~~~~~^^
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/concurrent/futures/process.py", line 354, in run
    p = self.processes.pop(result_item.exit_pid)
KeyError: 26371
Traceback (most recent call last):
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/multiprocessing/forkserver.py", line 277, in main
    code = _serve_one(child_r, fds,
                      unused_fds,
                      old_handlers)
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/multiprocessing/forkserver.py", line 317, in _serve_one
    code = spawn._main(child_r, parent_sentinel)
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/multiprocessing/spawn.py", line 132, in _main
    self = reduction.pickle.load(from_parent)
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/multiprocessing/synchronize.py", line 115, in __setstate__
    self._semlock = _multiprocessing.SemLock._rebuild(*state)
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory
Timeout (0:20:00)!
Thread 0x000000083361b300 (most recent call first):
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/threading.py", line 359 in wait
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/multiprocessing/queues.py", line 249 in _feed
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/threading.py", line 990 in run
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/threading.py", line 1039 in _bootstrap_inner
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/threading.py", line 1010 in _bootstrap


Traceback (most recent call last):
  File "/buildbot/buildarea/3.13.ware-freebsd/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot x86-64 MacOS Intel NoGIL 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1449/builds/81) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1449/builds/81

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/Users/ec2-user/buildbot/buildarea/3.13.itamaro-macos-intel-aws.nogil/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Debian root 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1441/builds/82) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1441/builds/82

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/root/buildarea/3.13.angelico-debian-amd64/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot wasm32-wasi 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1502/builds/83) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1502/builds/83

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows10 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1501/builds/78) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1501/builds/78

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "D:\buildarea\3.13.bolen-windows10\build\Lib\test\datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 RHEL7 LTO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1505/builds/71) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1505/builds/71

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-RHEL7-x86_64.lto/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL7 LTO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1390/builds/68) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1390/builds/68

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-rhel-z.lto/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL8 LTO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1458/builds/67) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1458/builds/67

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-rhel8-z.lto/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 RHEL8 LTO + PGO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1503/builds/63) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1503/builds/63

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 RHEL8 FIPS Only Blake2 Builtin Hash 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1455/builds/77) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1455/builds/77

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-RHEL8-fips-x86_64.no-builtin-hashes-except-blake2/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 RHEL8 LTO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1383/builds/64) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1383/builds/64

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-RHEL8-x86_64.lto/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Ubuntu Shared 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1450/builds/73) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1450/builds/73

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.13.bolen-ubuntu/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Fedora Stable 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1498/builds/53) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1498/builds/53

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-x86_64/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 MacOS M1 NoGIL 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1408/builds/66) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1408/builds/66

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/Users/ec2-user/buildbot/buildarea/3.13.itamaro-macos-arm64-aws.macos-with-brew.nogil/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 RHEL8 LTO + PGO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1451/builds/60) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1451/builds/60

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-RHEL8-aarch64.lto-pgo/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 RHEL8 LTO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1393/builds/60) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1393/builds/60

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-RHEL8-aarch64.lto/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Fedora Stable Clang 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1479/builds/53) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1479/builds/53

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-x86_64.clang/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Fedora Stable 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1506/builds/64) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1506/builds/64

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-aarch64/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Fedora Stable Clang 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1456/builds/65) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1456/builds/65

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-aarch64.clang/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x Fedora Clang 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1476/builds/54) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1476/builds/54

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-fedora-z.clang/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Fedora Stable LTO + PGO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1426/builds/55) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1426/builds/55

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-x86_64.lto-pgo/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Fedora Stable LTO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1490/builds/51) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1490/builds/51

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-x86_64.lto/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x Fedora LTO + PGO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1511/builds/54) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1511/builds/54

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-fedora-z.lto-pgo/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Fedora Stable LTO + PGO 3.13 has failed when building commit d58ebf0.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1433/builds/65) and take a look at the build logs.
4. Check if the failure is related to this commit (d58ebf0) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1433/builds/65

Failed tests:

• test_datetime

Failed subtests:

• test_utc_alias - test.datetimetester.TestModule_Fast.test_utc_alias

Summary of the results of the build (if available):

==

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.cstratak-fedora-stable-aarch64.lto-pgo/build/Lib/test/datetimetester.py", line 98, in test_utc_alias
    self.assertIs(UTC, timezone.utc)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
AssertionError: datetime.timezone(datetime.timedelta(0)) is not datetime.timezone.utc

This change introduced a reference leak: see issue gh-119655.