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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test__opcode fails with missing 'jump_backward' in specialization stats","articleBody":"# Bug report\n\n### Bug description:\n\nWhen running the `test__opcode` test with a build that uses `--enable-pystats`, there is a mismatch between the expected specialized opcodes and the actual ones. The test is expecting `jump_backward` in the specialized opcodes list, but it's not present in the actual stats. \n\n### Configuration\n```sh\n./configure --with-pydebug --enable-pystats\n```\n\n### Test Output\n```sh\n╰─$ ./python -m test test__opcode                                                                                                                                                                           82595ms\nUsing random seed: 2739258338\n0:00:00 load avg: 0.97 Run 1 test sequentially in a single process\n0:00:00 load avg: 0.97 [1/1] test__opcode\ntest test__opcode failed -- Traceback (most recent call last):\n  File \"/home/arf/Desktop/cpython/Lib/test/test__opcode.py\", line 131, in test_specialization_stats\n    self.assertCountEqual(stats.keys(), specialized_opcodes)\n    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAssertionError: Element counts were not equal:\nFirst has 0, Second has 1:  'jump_backward'\n\n0:00:00 load avg: 0.97 [1/1/1] test__opcode failed (1 failure)\n\n== Tests result: FAILURE ==\n\n1 test failed:\n    test__opcode\n\nTotal duration: 52 ms\nTotal tests: run=7 failures=1\nTotal test files: run=1/1 failed=1\nResult: FAILURE\n```\n\n### Environment\n- OS: Arch Linux (Linux 6.14.2-arch1-1)\n\n### CPython versions tested on:\n\nCPython main branch, 3.14\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-135606\n* gh-135612\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/furkanonder","@type":"Person","name":"furkanonder"},"datePublished":"2025-04-22T21:02:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/132815/cpython/issues/132815"}