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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"JIT executors are not properly freed","articleBody":"# Bug report\n\n### Bug description:\n\nPoC:\n```python\nimport bdb\ncode = 'a = 1\\nb = 2\\nc = a + b'\nglobals_dict = {}\nlocals_dict = {}\ndebugger = bdb.Bdb()\ndebugger.runctx(code, globals_dict, locals_dict)\nfor i in range(10):\n    pass\nwith tempfile.NamedTemporaryFile() as tmpfile:\n    tmpfile.seek(0)\n```\n\nConfig: `--enable-experimental-jit=yes --with-address-sanitizer`\n\nASan:\n```\nTraceback (most recent call last):\n  File \"min.py\", line 9, in \u003cmodule\u003e\n    with tempfile.NamedTemporaryFile() as tmpfile:\n         ^^^^^^^^\nNameError: name 'tempfile' is not defined. Did you mean: 'compile'? Or did you forget to import 'tempfile'?\n\n==3445760==ERROR: LeakSanitizer: detected memory leaks\n\nDirect leak of 600 byte(s) in 1 object(s) allocated from:\n    #0 0x7ab0b95889c7 in malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69\n    #1 0x5cc52547f6b7 in _PyObject_MallocWithType ../Include/internal/pycore_object_alloc.h:46\n    #2 0x5cc52547f6b7 in gc_alloc ../Python/gc.c:2327\n    #3 0x5cc52547f6b7 in _PyObject_GC_NewVar ../Python/gc.c:2369\n    #4 0x5cc52555de54 in make_executor_from_uops ../Python/optimizer.c:1120\n    #5 0x5cc52555de54 in uop_optimize ../Python/optimizer.c:1341\n    #6 0x5cc52555de54 in _PyOptimizer_Optimize ../Python/optimizer.c:136\n    #7 0x5cc524f27940 in _PyEval_EvalFrameDefault ../Python/generated_cases.c.h:7656\n    #8 0x5cc5253e9686 in _PyEval_EvalFrame ../Include/internal/pycore_ceval.h:121\n    #9 0x5cc5253e9686 in _PyEval_Vector ../Python/ceval.c:1997\n    #10 0x5cc5253e9686 in PyEval_EvalCode ../Python/ceval.c:880\n    #11 0x5cc5255a6b0e in run_eval_code_obj ../Python/pythonrun.c:1365\n    #12 0x5cc5255a6b0e in run_mod ../Python/pythonrun.c:1459\n    #13 0x5cc5255ab7b7 in pyrun_file ../Python/pythonrun.c:1293\n    #14 0x5cc5255ab7b7 in _PyRun_SimpleFileObject ../Python/pythonrun.c:521\n    #15 0x5cc5255ac2dc in _PyRun_AnyFileObject ../Python/pythonrun.c:81\n    #16 0x5cc525628bdc in pymain_run_file_obj ../Modules/main.c:410\n    #17 0x5cc525628bdc in pymain_run_file ../Modules/main.c:429\n    #18 0x5cc525628bdc in pymain_run_python ../Modules/main.c:691\n    #19 0x5cc52562a4be in Py_RunMain ../Modules/main.c:772\n    #20 0x5cc52562a4be in pymain_main ../Modules/main.c:802\n    #21 0x5cc52562a4be in Py_BytesMain ../Modules/main.c:826\n    #22 0x7ab0b91ba1c9  (/lib/x86_64-linux-gnu/libc.so.6+0x2a1c9) (BuildId: 282c2c16e7b6600b0b22ea0c99010d2795752b5f)\n    #23 0x7ab0b91ba28a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2a28a) (BuildId: 282c2c16e7b6600b0b22ea0c99010d2795752b5f)\n    #24 0x5cc524f4cf54 in _start (cpython/build/python+0x218f54) (BuildId: 3087b1f6c97d85c049f8eaa36e3ac5b15eccf317)\n\nSUMMARY: AddressSanitizer: 600 byte(s) leaked in 1 allocation(s).\n```\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-139952\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/YuanchengJiang","@type":"Person","name":"YuanchengJiang"},"datePublished":"2025-10-03T08:40:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":25},"url":"https://github.com/139540/cpython/issues/139540"}