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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Assertion failure in Python/optimizer.c _PyOptimizer_Optimize in JIT","articleBody":"# Crash report\n\n### What happened?\n\n```python\nimport sys\nimport unittest\nfrom unittest import TestCase\nclass InstrumentationMultiThreadedMixin:\n    thread_count = 10\n    func_count = 50\n    def after_threads(self):\n        pass\n    def test_instrumentation(self):\n        for i in range(self.func_count):\n            x = {}\n        threads = []\n        for i in range(self.thread_count):\n            for t in threads:\n                break\n            self.during_threads()\nclass SetTraceMultiThreaded(InstrumentationMultiThreadedMixin, TestCase):\n    def setUp(self):\n        self.set = 2**31-1\n    def after_test(self):\n        self.assertTrue(self.called)\n    def tearDown(self):\n        sys.settrace(1023)\n    def trace_func(self, frame, event, arg):\n        return self.trace_func\n    def during_threads(self):\n        if self.set:\n            sys.settrace(self.trace_func)\n        t.join()\nif __name__ == \"__main__\":\n    unittest.main()\n```\n\n```\n...\nTypeError: 'int' object is not callable\npython: ../Python/optimizer.c:121: _PyOptimizer_Optimize: Assertion `interp-\u003ejit' failed.\nAborted (core dumped)\n```\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nLinux\n\n### Output from running 'python -VV' on the command line:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-140969\n* gh-141494\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/YuanchengJiang","@type":"Person","name":"YuanchengJiang"},"datePublished":"2025-11-03T08:14:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/140936/cpython/issues/140936"}