Memory leak in _PyJit_TryInitializeTracing when daemon thread exits #144068
Description
Bug report
Bug description:
import threading
import time
def hot_loop():
# A hot loop involving function calls (time.time) to trigger
# Tier 2 JIT optimization.
# We run this long enough to ensure it's active during interpreter shutdown.
end = time.time() + 5.0
while time.time() < end:
pass
# 1. Create a daemon thread (crucial: daemon threads are killed/abandoned at shutdown)
t = threading.Thread(target=hot_loop, daemon=True)
t.start()
# 2. Allow brief time for the thread to start and trigger the JIT (Trace/Optimizer)
time.sleep(0.1)
# 3. Exit immediately.
# The daemon thread is still running. The interpreter shutdown process
# appears to fail to free the JIT memory allocated for this thread.=================================================================
==181062==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 261216 byte(s) in 1 object(s) allocated from:
#0 0x614025821fb4 in malloc (/home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/python+0x385fb4) (BuildId: 066bbf729257aedd916af3db6dae04834cf3a8ba)
#1 0x61402634af9e in _PyJit_TryInitializeTracing /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/optimizer.c:1028:58
#2 0x614025deb313 in _PyEval_EvalFrameDefault /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/generated_cases.c.h:7705:32
#3 0x614025db9387 in _PyEval_EvalFrame /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Include/internal/pycore_ceval.h:118:16
#4 0x614025db9387 in _PyEval_Vector /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/ceval.c:2092:12
#5 0x614025a33e8f in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Include/internal/pycore_call.h:136:11
#6 0x614025a31309 in method_vectorcall /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Objects/classobject.c:73:20
#7 0x614025e76ca2 in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Include/internal/pycore_call.h:136:11
#8 0x614025e76ca2 in context_run /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/context.c:727:29
#9 0x614025a5397c in method_vectorcall_FASTCALL_KEYWORDS /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Objects/descrobject.c:421:24
#10 0x614025a2735f in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Include/internal/pycore_call.h:136:11
#11 0x614025dba4ec in _Py_VectorCallInstrumentation_StackRefSteal /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/ceval.c:762:11
#12 0x614025df62dd in _PyEval_EvalFrameDefault /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/generated_cases.c.h:1788:35
#13 0x614025db9387 in _PyEval_EvalFrame /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Include/internal/pycore_ceval.h:118:16
#14 0x614025db9387 in _PyEval_Vector /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/ceval.c:2092:12
#15 0x614025a33e8f in _PyObject_VectorcallTstate /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Include/internal/pycore_call.h:136:11
#16 0x614025a31309 in method_vectorcall /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Objects/classobject.c:73:20
#17 0x614025a29b29 in _PyVectorcall_Call /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Objects/call.c:273:16
#18 0x6140265bca0a in thread_run /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Modules/_threadmodule.c:387:21
#19 0x614026424845 in pythread_wrapper /home/fuzz/WorkSpace/FusionFuzzLoop/projects/cpython/cpython/build/../Python/thread_pthread.h:234:5
#20 0x61402581f896 in asan_thread_start(void*) asan_interceptors.cpp.o
SUMMARY: AddressSanitizer: 261216 byte(s) leaked in 1 allocation(s).
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux