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test_sys_settrace segfaults on main #109143

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Closed as not planned
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3.13bugs and security fixestype-crashA hard crash of the interpreter, possibly with a core dump
@JelleZijlstra

Description

@JelleZijlstra

Crash report

On cleanmain:

% ./python.exe -m test -R 3:3 test_sys_settraceRaised RLIMIT_NOFILE: 256 -> 10240:00:00 load avg: 2.44 Run tests sequentially0:00:00 load avg: 2.44 [1/1] test_sys_settracebeginning 6 repetitions123456...Fatal Python error: Segmentation faultCurrent thread 0x00000001fd5ade00 (most recent call first):  File "/Users/jelle/py/cpython/Lib/test/test_sys_settrace.py", line 1912 in trace  File "/Users/jelle/py/cpython/Lib/test/test_sys_settrace.py", line 2162 in test_jump_backwards_into_while_block  File "/Users/jelle/py/cpython/Lib/test/test_sys_settrace.py", line 1975 in run_test  File "/Users/jelle/py/cpython/Lib/test/test_sys_settrace.py", line 2008 in test  File "/Users/jelle/py/cpython/Lib/unittest/case.py", line 589 in _callTestMethod  File "/Users/jelle/py/cpython/Lib/unittest/case.py", line 634 in run  File "/Users/jelle/py/cpython/Lib/unittest/case.py", line 690 in __call__  File "/Users/jelle/py/cpython/Lib/unittest/suite.py", line 122 in run  File "/Users/jelle/py/cpython/Lib/unittest/suite.py", line 84 in __call__  File "/Users/jelle/py/cpython/Lib/unittest/suite.py", line 122 in run  File "/Users/jelle/py/cpython/Lib/unittest/suite.py", line 84 in __call__  File "/Users/jelle/py/cpython/Lib/unittest/suite.py", line 122 in run  File "/Users/jelle/py/cpython/Lib/unittest/suite.py", line 84 in __call__  File "/Users/jelle/py/cpython/Lib/test/support/testresult.py", line 146 in run  File "/Users/jelle/py/cpython/Lib/test/support/__init__.py", line 1141 in _run_suite  File "/Users/jelle/py/cpython/Lib/test/support/__init__.py", line 1268 in run_unittest  File "/Users/jelle/py/cpython/Lib/test/libregrtest/runtest.py", line 393 in run_unittest  File "/Users/jelle/py/cpython/Lib/test/libregrtest/runtest.py", line 447 in test_func  File "/Users/jelle/py/cpython/Lib/test/libregrtest/refleak.py", line 91 in dash_R  File "/Users/jelle/py/cpython/Lib/test/libregrtest/runtest.py", line 405 in regrtest_runner  File "/Users/jelle/py/cpython/Lib/test/libregrtest/runtest.py", line 451 in _load_run_test  File "/Users/jelle/py/cpython/Lib/test/libregrtest/runtest.py", line 491 in _runtest_env_changed_exc  File "/Users/jelle/py/cpython/Lib/test/libregrtest/runtest.py", line 348 in _runtest  File "/Users/jelle/py/cpython/Lib/test/libregrtest/runtest.py", line 375 in runtest  File "/Users/jelle/py/cpython/Lib/test/libregrtest/main.py", line 462 in run_test  File "/Users/jelle/py/cpython/Lib/test/libregrtest/main.py", line 495 in run_tests_sequentially  File "/Users/jelle/py/cpython/Lib/test/libregrtest/main.py", line 632 in run_tests  File "/Users/jelle/py/cpython/Lib/test/libregrtest/main.py", line 855 in action_run_tests  File "/Users/jelle/py/cpython/Lib/test/libregrtest/main.py", line 883 in _main  File "/Users/jelle/py/cpython/Lib/test/libregrtest/main.py", line 822 in main  File "/Users/jelle/py/cpython/Lib/test/libregrtest/main.py", line 891 in main  File "/Users/jelle/py/cpython/Lib/test/__main__.py", line 2 in <module>  File "/Users/jelle/py/cpython/Lib/runpy.py", line 88 in _run_code  File "/Users/jelle/py/cpython/Lib/runpy.py", line 198 in _run_module_as_mainExtension modules: _testcapi (total: 1)zsh: segmentation fault  ./python.exe -m test -R 3:3 test_sys_settrace

I saw this in buildbots on my PR#109123 but it also reproduces on main for me locally.

Stack trace:

Process 47388 stopped* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8)    frame #0: 0x000000010008c140 python.exe`code_richcompare(self=0x00000001025453f0, other=0x00000001025453f0, op=3) at codeobject.c:1808:39 [opt]   1805   1806        if (co_code == ENTER_EXECUTOR) {   1807            const int exec_index = co_arg;-> 1808            _PyExecutorObject *exec = co->co_executors->executors[exec_index];   1809            co_code = exec->vm_data.opcode;   1810            co_arg = exec->vm_data.oparg;   1811        }Target 0: (python.exe) stopped.warning: python.exe was compiled with optimization - stepping may behave oddly; variables may not be available.(lldb) bt* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8)  * frame #0: 0x000000010008c140 python.exe`code_richcompare(self=0x00000001025453f0, other=0x00000001025453f0, op=3) at codeobject.c:1808:39 [opt]    frame #1: 0x00000001000d2b14 python.exe`do_richcompare(tstate=0x00000001004ea308, v=0x00000001025453f0, w=0x00000001025453f0, op=3) at object.c:787:15 [opt]    frame #2: 0x00000001000d2a64 python.exe`PyObject_RichCompare(v=0x00000001025453f0, w=0x00000001025453f0, op=3) at object.c:836:21 [opt]    frame #3: 0x0000000100168354 python.exe`_PyEval_EvalFrameDefault(tstate=<unavailable>, frame=<unavailable>, throwflag=<unavailable>) at generated_cases.c.h:2757:19 [opt]    frame #4: 0x000000010015e0b4 python.exe`_PyEval_EvalFrame(tstate=<unavailable>, frame=<unavailable>, throwflag=<unavailable>) at pycore_ceval.h:107:16 [opt]    frame #5: 0x000000010015e04c python.exe`_PyEval_Vector(tstate=0x00000001004ea308, func=0x00000001036c2bd0, locals=0x0000000000000000, args=0x000000016fdfc340, argcount=4, kwnames=0x0000000000000000) at ceval.c:1632:12 [opt]    frame #6: 0x0000000100086758 python.exe`_PyFunction_Vectorcall(func=0x00000001036c2bd0, stack=0x000000016fdfc340, nargsf=<unavailable>, kwnames=0x0000000000000000) at call.c:0:45 [opt]    frame #7: 0x00000001000894d8 python.exe`_PyObject_VectorcallTstate(tstate=0x00000001004ea308, callable=0x00000001036c2bd0, args=0x000000016fdfc340, nargsf=4, kwnames=0x0000000000000000) at pycore_call.h:187:11 [opt]    frame #8: 0x000000010008898c python.exe`method_vectorcall(method=<unavailable>, args=0x000000016fdfc3f0, nargsf=<unavailable>, kwnames=0x0000000000000000) at classobject.c:92:18 [opt]    frame #9: 0x00000001001dfbc0 python.exe`_PyObject_VectorcallTstate(tstate=0x00000001004ea308, callable=0x000000010372cc50, args=0x000000016fdfc3f0, nargsf=3, kwnames=0x0000000000000000) at pycore_call.h:187:11 [opt]    frame #10: 0x00000001001e1c34 python.exe`call_trampoline(tstate=0x00000001004ea308, callback=0x000000010372cc50, frame=0x0000000103650ef0, what=2, arg=<unavailable>) at sysmodule.c:1005:24 [opt]    frame #11: 0x00000001001e1d8c python.exe`trace_trampoline(self=<unavailable>, frame=0x0000000103650ef0, what=2, arg=0x0000000100451758) at sysmodule.c:1042:24 [opt]    frame #12: 0x00000001001b4c24 python.exe`_Py_call_instrumentation_line(tstate=0x00000001004ea308, frame=<unavailable>, instr=<unavailable>, prev=<unavailable>) at instrumentation.c:1173:27 [opt]

The problem is thatco->co_executors is NULL. This line blames to@corona10's PR#108165.

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    3.13bugs and security fixestype-crashA hard crash of the interpreter, possibly with a core dump

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