bpo-36356: Destroy the GIL at exit

[vstinner]

• Add _PyEval_FiniThreads2(). _PyEval_FiniThreads() now only clears
  the pending lock, whereas _PyEval_FiniThreads2() destroys the GIL.
• pymain_free() now calls _PyEval_FiniThreads2().
• Py_FinalizeEx() now calls _PyEval_FiniThreads().

https://bugs.python.org/issue36356

[vstinner]

Failure on AppVeyor:

FAIL: test_env_var_invalid (test.test_tracemalloc.TestCommandLine) (nframe=1073741824)
----------------------------------------------------------------------
Traceback (most recent call last):
File "C:\projects\cpython\lib\test\test_tracemalloc.py", line 894, in test_env_var_invalid
self.check_env_var_invalid(nframe)
File "C:\projects\cpython\lib\test\test_tracemalloc.py", line 888, in check_env_var_invalid
self.fail(f"unexpeced output: {stderr!a}")
AssertionError: unexpeced output: b"Fatal Python error: _Py_InitializeMainInterpreter: can't initialize tracemalloc\nWindows fatal exception: access violation\n\nCurrent thread 0x000003d4 (most recent call first):"

[vstinner]

PR #12667 might help to make Python more reliable with this change.

[vstinner]

With this change, test_tracemalloc fails because pymain_exit_error() tries to cleanup too many things, even for errors. I wrote PR #12968 to leave the runtime alive on this case, it fix test_tracemalloc.

[vstinner]

I merged my PR #12968 and rebased this PR on top of it. It should fix test_tracemalloc.

[vstinner]

The Ubuntu PR Tests Job of Azure Pipelines PR failed with:

FAIL: test_daemon_threads_shutdown_stderr_deadlock (test.test_io.CMiscIOTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/vsts/work/1/s/Lib/test/test_io.py", line 4189, in test_daemon_threads_shutdown_stderr_deadlock
self.check_daemon_threads_shutdown_deadlock('stderr')
File "/home/vsts/work/1/s/Lib/test/test_io.py", line 4177, in check_daemon_threads_shutdown_deadlock
self.assertIn("Fatal Python error: could not acquire lock "
AssertionError: "Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stderr>'> at interpreter shutdown, possibly due to daemon threads" not found in '...
(...)
.......................!.Fatal Python error: PyCOND_FINI(_PyRuntime.ceval.gil.cond) failed'
test test_io failed

[vstinner]

I don't understand test_io failuire. I prefer to wait until PR #12667 is merged to see if it does fix this issue. In the meanwhile, I put this issue again in WIP state.

[vstinner]

I merged PR #12667 and then rebased this PR on top of it.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL 3.x has failed when building commit b36e5d6.

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/21/builds/2780) and take a look at the build logs.
4. Check if the failure is related to this commit (b36e5d6) 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/21/builds/2780

Click to see traceback logs

Traceback (most recent call last):
File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z/build/Lib/test/test_io.py", line 4186, in test_daemon_threads_shutdown_stdout_deadlockself.check_daemon_threads_shutdown_deadlock('stdout')
File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z/build/Lib/test/test_io.py", line 4177, in check_daemon_threads_shutdown_deadlockself.assertIn("Fatal Python error: could not acquire lock "AssertionError: "Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stdout>'> at interpreter shutdown, possibly due to daemon threads" not found in 'Fatal Python error: PyCOND_FINI(_PyRuntime.ceval.gil.cond) failed'
----------------------------------------------------------------------
Ran 606 tests in 35.026s
FAILED (failures=1, skipped=2)
Traceback (most recent call last):
File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z/build/Lib/test/test_io.py", line 4186, in test_daemon_threads_shutdown_stdout_deadlockself.check_daemon_threads_shutdown_deadlock('stdout')
File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel-z/build/Lib/test/test_io.py", line 4177, in check_daemon_threads_shutdown_deadlockself.assertIn("Fatal Python error: could not acquire lock "AssertionError: "Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stdout>'> at interpreter shutdown, possibly due to daemon threads" not found in 'Fatal Python error: PyCOND_FINI(_PyRuntime.ceval.gil.cond) failed'
----------------------------------------------------------------------
Ran 606 tests in 36.979s
FAILED (failures=1, skipped=2)

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Debian root 3.x has failed when building commit b36e5d6.

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/27/builds/2759) and take a look at the build logs.
4. Check if the failure is related to this commit (b36e5d6) 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/27/builds/2759

Click to see traceback logs

Traceback (most recent call last):
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4189, in test_daemon_threads_shutdown_stderr_deadlockself.check_daemon_threads_shutdown_deadlock('stderr')
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4177, in check_daemon_threads_shutdown_deadlockself.assertIn("Fatal Python error: could not acquire lock "
AssertionError: "Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stderr>'> at interpreter shutdown, possibly due to daemon threads" not found in '....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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Traceback (most recent call last):
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4186, in test_daemon_threads_shutdown_stdout_deadlockself.check_daemon_threads_shutdown_deadlock('stdout')
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4177, in check_daemon
_threads_shutdown_deadlock
self.assertIn("Fatal Python error: could not acquire lock "AssertionError: "Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stdout>'> at interpreter shutdown, possibly due to daemon threads" not found in 'Fatal Python error: PyCOND_FINI(_PyRuntime.ceval.gil.cond) failed'
----------------------------------------------------------------------
Ran 606 tests in 36.536s
FAILED (failures=2, skipped=2)
Traceback (most recent call last):
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4189, in test_daemon_threads_shutdown_stderr_deadlockself.check_daemon_threads_shutdown_deadlock('stderr')
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4177, in check_daemon_threads_shutdown_deadlockself.assertIn("Fatal Python error: could not acquire lock "
AssertionError: "Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stderr>'> at interpreter shutdown, possibly due to daemon threads" not found in '....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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Traceback (most recent call last):
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4186, in test_daemon_threads_shutdown_stdout_deadlockself.check_daemon_threads_shutdown_deadlock('stdout')
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_io.py", line 4177, in check_daemon_threads_shutdown_deadlockself.assertIn("Fatal Python error: could not acquire lock "AssertionError: "Fatal Python error: could not acquire lock for <_io.BufferedWriter name='<stdout>'> at interpreter shutdown, possibly due to daemon threads" not found in 'Fatal Python error: PyCOND_FINI(_PyRuntime.ceval.gil.cond) failed'
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Ran 606 tests in 33.425s
FAILED (failures=2, skipped=2)