gh-120289: Add external timer in traverse of _lsprof.Profiler

[gaogaotiantian]

It turned out that we did not include the external timer in tp_traverse, and the external timer could be a container that causes a ref cycle - this could lead to ref leak.

Confirmed that ./python -m test -R3:3 test_cprofile passed after the change.

• Issue: Use After Free in initContext(_lsprof.c) #120289

[gaogaotiantian]

@colesbury maybe you could take a quick look at this?

[gaogaotiantian]

Thanks!

[miss-islington-app]

Thanks @gaogaotiantian for the PR 🌮🎉.. I'm working now to backport this PR to: 3.12, 3.13.
🐍🍒⛏🤖

[bedevere-app]

GH-122000 is a backport of this pull request to the 3.13 branch.

[bedevere-app]

GH-122001 is a backport of this pull request to the 3.12 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x Fedora 3.13 has failed when building commit e992cc3.

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/#builders/1403/builds/215) and take a look at the build logs.
4. Check if the failure is related to this commit (e992cc3) 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/#builders/1403/builds/215

Failed tests:

• test_pyrepl

Failed subtests:

• test_inspect_keeps_globals_from_inspected_module - test.test_pyrepl.test_pyrepl.TestMain.test_inspect_keeps_globals_from_inspected_module

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-fedora-z/build/Lib/test/test_pyrepl/test_pyrepl.py", line 995, in _run_repl_globals_test
    self.fail(f"{var}= not found in output")
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: __package__= not found in output


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-fedora-z/build/Lib/test/test_pyrepl/test_pyrepl.py", line 995, in _run_repl_globals_test
    self.fail(f"{var}= not found in output")
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: FOO= not found in output


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-fedora-z/build/Lib/test/test_pyrepl/test_pyrepl.py", line 995, in _run_repl_globals_test
    self.fail(f"{var}= not found in output")
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: __name__= not found in output


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.13.edelsohn-fedora-z/build/Lib/test/test_pyrepl/test_pyrepl.py", line 995, in _run_repl_globals_test
    self.fail(f"{var}= not found in output")
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: __file__= not found in output