gh-122712: Test CALL_ALLOC_AND_ENTER_INIT handles reassignment of __code__

[mpage]

Add a test to verify CALL_ALLOC_AND_ENTER_INIT handles the case where the __init__ function's code object is reassigned.

• Issue: Specializing interpreter may crash if the code object of a class's __init__ method is reassigned #122712

[mpage]

Failing hypothesis tests are a known issue: #122686

[mpage]

JIT test failures look like unrelated issues with qemu:

ERROR:../../plugins/core.c:221:qemu_plugin_vcpu_init_hook: assertion failed: (success) Bail out! ERROR:../../plugins/core.c:221:qemu_plugin_vcpu_init_hook: assertion failed: (success) aarch64-binfmt-P: ./include/qemu/rcu.h:101: rcu_read_unlock: Assertion `p_rcu_reader->depth != 0' failed. 

[mpage]

@brandtbucher@markshannon - I've updated this to perform the necessary checks inline in CALL_ALLOC_AND_ENTER_INIT rather than use function versions. Would you please have a look?

[markshannon]

This looks like the correct fix. Thanks.

I'd like the DEOPT test streamlined a bit, but it looks good otherwise.

[bedevere-app]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[brandtbucher]

Agreed with @markshannon's suggestion. Otherwise, looks good!

[mpage]

Looks like this was fixed on main by gh-123140. The underlying issue is still present in 3.13, however. @markshannon how would you like to proceed with fixing on 3.13?

[bedevere-app]

GH-123184 is a backport of this pull request to the 3.13 branch.

[mpage]

Closing this since gh-123140 fixes it on main.

[markshannon]

Sorry. I meant to merge this first, so we got the test before changing CALL_ALLOC_AND_ENTER_INIT. It appears I forgot.

Do you want to re-open this PR with just the test, or make a new one?

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot iOS ARM64 Simulator 3.13 has failed when building commit 50a595b.

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/1386/builds/496) and take a look at the build logs.
4. Check if the failure is related to this commit (50a595b) 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/1386/builds/496

Failed tests:

• test_import

Failed subtests:

• test_basic_multiple_interpreters_deleted_no_reset - test.test_import.SinglephaseInitTests.test_basic_multiple_interpreters_deleted_no_reset

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

==

Click to see traceback logs

TracebackTests.test_exec_failure_nested) ... ok TracebackTests.test_nonexistent_module_nested) ... ok TracebackTests.test_syntax_error) ... ok TracebackTests.test_nonexistent_module) ... ok TracebackTests.test_unencodable_filename) ... skipped 'need TESTFN_UNENCODABLE' TracebackTests.test_broken_parent_from) ... ok TracebackTests.test_broken_from) ... ok TracebackTests.test_exec_failure) ... ok TracebackTests.test_broken_parent) ... ok TracebackTests.test_import_bug) ... ok TracebackTests.test_broken_submodule) ... ok Traceback (most recent call last): File "/Users/buildbot/Library/Developer/XCTestDevices/163B47BC-A1C1-4382-9772-4D79687530BB/data/Containers/Bundle/Application/FDBABAF6-E02D-45C5-A42C-5FCCA078C9B2/iOSTestbed.app/python/lib/python3.13/test/test_import/__init__.py", line 136, in wrapper func(self) ~~~~^^^^^^ File "/Users/buildbot/Library/Developer/XCTestDevices/163B47BC-A1C1-4382-9772-4D79687530BB/data/Containers/Bundle/Application/FDBABAF6-E02D-45C5-A42C-5FCCA078C9B2/iOSTestbed.app/python/lib/python3.13/test/test_import/__init__.py", line 3031, in test_basic_multiple_interpreters_deleted_no_resetself.check_copied(loaded_interp1, base) ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/Library/Developer/XCTestDevices/163B47BC-A1C1-4382-9772-4D79687530BB/data/Containers/Bundle/Application/FDBABAF6-E02D-45C5-A42C-5FCCA078C9B2/iOSTestbed.app/python/lib/python3.13/test/test_import/__init__.py", line 2694, in check_copiedself.assertNotEqual(snap.id, base.snapshot.id) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^AssertionError: 4607884272 == 4607884272

[ericsnowcurrently]

====================================================================== FAIL: test_basic_multiple_interpreters_deleted_no_reset (test.test_import.SinglephaseInitTests.test_basic_multiple_interpreters_deleted_no_reset) ---------------------------------------------------------------------- Traceback (most recent call last): File "/Users/buildbot/Library/Developer/XCTestDevices/163B47BC-A1C1-4382-9772-4D79687530BB/data/Containers/Bundle/Application/FDBABAF6-E02D-45C5-A42C-5FCCA078C9B2/iOSTestbed.app/python/lib/python3.13/test/test_import/__init__.py", line 136, in wrapper func(self) ~~~~^^^^^^ File "/Users/buildbot/Library/Developer/XCTestDevices/163B47BC-A1C1-4382-9772-4D79687530BB/data/Containers/Bundle/Application/FDBABAF6-E02D-45C5-A42C-5FCCA078C9B2/iOSTestbed.app/python/lib/python3.13/test/test_import/__init__.py", line 3031, in test_basic_multiple_interpreters_deleted_no_reset self.check_copied(loaded_interp1, base) ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^ File "/Users/buildbot/Library/Developer/XCTestDevices/163B47BC-A1C1-4382-9772-4D79687530BB/data/Containers/Bundle/Application/FDBABAF6-E02D-45C5-A42C-5FCCA078C9B2/iOSTestbed.app/python/lib/python3.13/test/test_import/__init__.py", line 2694, in check_copied self.assertNotEqual(snap.id, base.snapshot.id) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^ AssertionError: 4607884272 == 4607884272 ---------------------------------------------------------------------- 

[ericsnowcurrently]

Also, the failure is relative to the 3.13 backport: gh-123184.

[mpage]

That failure seems like it should be unrelated to this change. I also haven't been able to reproduce it locally.

[mpage]

@markshannon - No worries. Reopened this with just the test.

[markshannon]

Thanks