Thread Sanitizer failure: `LLVMSymbolizer: error reading file: No such file or directory` in free-threaded TSan CI

[colesbury]

See: https://github.com/python/cpython/actions/runs/8915487425/job/24485217543 and https://github.com/python/cpython/actions/runs/8915976859/job/24486582444?pr=118493

0:03:54 load avg: 3.29 [21/22/1] test_threading failed (1 failure) (1 min 5 sec) -- running (1): test_weakref (56.6 sec)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadJoinOnShutdown testMethod=test_2_join_in_forked_process>>)
  return self.run(*args, **kwds)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadJoinOnShutdown testMethod=test_3_join_in_forked_from_thread>>)
  return self.run(*args, **kwds)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadJoinOnShutdown testMethod=test_clear_threads_states_after_fork>>)
  return self.run(*args, **kwds)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadJoinOnShutdown testMethod=test_reinit_tls_after_fork>>)
  return self.run(*args, **kwds)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadTests testMethod=test_dummy_thread_after_fork>>)
  return self.run(*args, **kwds)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadTests testMethod=test_is_alive_after_fork>>)
  return self.run(*args, **kwds)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadTests testMethod=test_main_thread_after_fork>>)
  return self.run(*args, **kwds)
/home/runner/work/cpython/cpython/Lib/unittest/case.py:707: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method skip.<locals>.decorator of <test.test_threading.ThreadTests testMethod=test_main_thread_after_fork_from_nonmain_thread>>)
  return self.run(*args, **kwds)
test test_threading failed -- Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython/Lib/test/test_threading.py", line 8[50](https://github.com/python/cpython/actions/runs/8915487425/job/24485217543#step:12:51), in test_main_thread_after_fork_from_dummy_thread
    self.test_main_thread_after_fork_from_foreign_thread(create_dummy=True)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/cpython/cpython/Lib/test/test_threading.py", line 839, in test_main_thread_after_fork_from_foreign_thread
    self.assertEqual(err.decode(), "")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
AssertionError: 'LLVMSymbolizer: error reading file: No such file or directory\n' != ''
- LLVMSymbolizer: error reading file: No such file or directory
0:04:17 load avg: 2.64 [22/22/1] test_weakref passed (1 min 19 sec)

Linked PRs

• gh-118495: Skip test using threads after forking when running with TSAN #118530