memory leak in `_PyJit_TryInitializeTracing`

Bug report

Bug description:

import threading
import time
import unittest
class TestCpuModeFiltering(unittest.TestCase):
        def idle_worker():
            try:
                time.sleep(5)
            except Exception:
                return
        def cpu_active_worker():
            end = time.time() + 0.1
            x = 0
            while time.time() < end:
                x += 1
        cpu_thread = threading.Thread(target=cpu_active_worker, name="cpu_active_worker", daemon=True)
        cpu_thread.start()
        self.assertIn('idle_worker', wall_mode_output)
if __name__ == "__main__":
    unittest.main()

=================================================================
==2566930==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 72000 byte(s) in 1 object(s) allocated from:
    #0 0x5ceb3b3f4c38 in malloc (/home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/python+0x35fc38) (BuildId: 1f588d55837e5ca248154490b63acc5259fe73cf)
    #1 0x5ceb3bc6ac41 in _PyJit_TryInitializeTracing /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Python/optimizer.c:981:70
    #2 0x5ceb3b9bd742 in _PyEval_EvalFrameDefault /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Python/generated_cases.c.h:7660:32
    #3 0x5ceb3b989f0a in _PyEval_EvalFrame /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Include/internal/pycore_ceval.h:121:16
    #4 0x5ceb3b989f0a in _PyEval_Vector /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Python/ceval.c:2111:12
    #5 0x5ceb3b6076ef in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Include/internal/pycore_call.h:169:11
    #6 0x5ceb3b604b69 in method_vectorcall /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Objects/classobject.c:73:20
    #7 0x5ceb3ba57092 in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Include/internal/pycore_call.h:169:11
    #8 0x5ceb3ba57092 in context_run /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Python/context.c:728:29
    #9 0x5ceb3b627143 in method_vectorcall_FASTCALL_KEYWORDS /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Objects/descrobject.c:421:24
    #10 0x5ceb3b5fa6ff in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Include/internal/pycore_call.h:169:11
    #11 0x5ceb3b9cd870 in _PyEval_EvalFrameDefault /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Python/generated_cases.c.h:1620:35
    #12 0x5ceb3b989f0a in _PyEval_EvalFrame /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Include/internal/pycore_ceval.h:121:16
    #13 0x5ceb3b989f0a in _PyEval_Vector /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Python/ceval.c:2111:12
    #14 0x5ceb3b6076ef in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Include/internal/pycore_call.h:169:11
    #15 0x5ceb3b604b69 in method_vectorcall /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Objects/classobject.c:73:20
    #16 0x5ceb3b5fcea9 in _PyVectorcall_Call /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Objects/call.c:273:16
    #17 0x5ceb3bed35fa in thread_run /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Modules/_threadmodule.c:387:21
    #18 0x5ceb3bd3ba75 in pythread_wrapper /home/fuzz/WorkSpace/flowfusion-cpython/cpython/build/../Python/thread_pthread.h:234:5
    #19 0x5ceb3b3f24ba in asan_thread_start(void*) asan_interceptors.cpp.o

SUMMARY: AddressSanitizer: 72000 byte(s) leaked in 1 allocation(s).

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Inspectez l’allocation à l’emplacement Python/optimizer.c:981 dans _PyJit_TryInitializeTracing et suivez ses chemins de nettoyage. Reproduisez l’exemple de threading fourni avec LeakSanitizer, puis vérifiez que l’allocation de 72 000 octets est libérée et que le rapport de fuite n’apparaît plus.