René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Assertion failure on interrupt when catching exception group","articleBody":"This (maybe too made-up and detached from reality) repro causes assertion failure when executed on current main (32df540635cacce1053ee0ef98ee23f3f6a43c02).\r\nOn 3.11 it warns about \"lost sys.stderr\" and terminates.\r\n\r\n```python3\r\nimport time\r\nimport threading\r\nimport _thread\r\n\r\ndef f():\r\n    try:\r\n        f()\r\n    except RecursionError:\r\n        f()\r\n\r\ndef g():\r\n    try:\r\n        raise ValueError()\r\n    except* ValueError:\r\n        f()\r\n\r\ndef h():\r\n    time.sleep(1)\r\n    _thread.interrupt_main()\r\n\r\nt = threading.Thread(target=h)\r\nt.start()\r\ng()\r\nt.join()\r\n```\r\n\r\nOutput:\r\n```\r\npython: Objects/typeobject.c:4183: _PyType_Lookup: Assertion `!PyErr_Occurred()' failed.\r\nAborted (core dumped)\r\n```\r\n\r\nStack trace:\r\n```c++\r\n#0  0x00007ffff7d3f34c in __pthread_kill_implementation () from /usr/lib/libc.so.6\r\n#1  0x00007ffff7cf24b8 in raise () from /usr/lib/libc.so.6\r\n#2  0x00007ffff7cdc534 in abort () from /usr/lib/libc.so.6\r\n#3  0x00007ffff7cdc45c in __assert_fail_base.cold () from /usr/lib/libc.so.6\r\n#4  0x00007ffff7ceb116 in __assert_fail () from /usr/lib/libc.so.6\r\n#5  0x000055555574ecd9 in _PyType_Lookup (type=type@entry=0x555555be5430, name=name@entry=0x555555bb7c10 \u003c_PyRuntime+334480\u003e)\r\n    at Objects/typeobject.c:4183\r\n#6  0x00005555557319e3 in _PyObject_GenericGetAttrWithDict (obj=0x7ffff77a7c90, name=0x555555bb7c10 \u003c_PyRuntime+334480\u003e, dict=dict@entry=0x0, \r\n    suppress=suppress@entry=1) at Objects/object.c:1266\r\n#7  0x0000555555731d8d in _PyObject_LookupAttr (v=0x7ffff77a7c90, name=\u003coptimized out\u003e, result=result@entry=0x7ffffff40780) at Objects/object.c:933\r\n#8  0x000055555582764c in print_exception_file_and_line (ctx=ctx@entry=0x7fffffffe270, value_p=value_p@entry=0x7ffffff40808)\r\n    at Python/pythonrun.c:941\r\n#9  0x0000555555827ed2 in print_exception (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff77a7c90) at Python/pythonrun.c:1209\r\n#10 0x0000555555827fcc in print_exception_group (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff77a7c90) at Python/pythonrun.c:1377\r\n#11 0x0000555555828418 in print_exception_recursive (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff77a7c90) at Python/pythonrun.c:1491\r\n#12 0x0000555555828491 in print_chained (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff77a7c90, \r\n    message=message@entry=0x55555594b200 \u003ccontext_message\u003e \"During handling of the above exception, another exception occurred:\\n\", \r\n    tag=tag@entry=0x5555558deda0 \"context\") at Python/pythonrun.c:1254\r\n#13 0x000055555582868e in print_exception_cause_and_context (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff780e900)\r\n    at Python/pythonrun.c:1344\r\n#14 0x00005555558283d3 in print_exception_recursive (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff780e900) at Python/pythonrun.c:1482\r\n#15 0x0000555555828491 in print_chained (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff780e900, \r\n    message=message@entry=0x55555594b200 \u003ccontext_message\u003e \"During handling of the above exception, another exception occurred:\\n\", \r\n    tag=tag@entry=0x5555558deda0 \"context\") at Python/pythonrun.c:1254\r\n\r\n...\r\n\r\n#16186 0x000055555582868e in print_exception_cause_and_context (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff6be0ec0)\r\n    at Python/pythonrun.c:1344\r\n#16187 0x00005555558283d3 in print_exception_recursive (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff6be0ec0) at Python/pythonrun.c:1482\r\n#16188 0x0000555555828491 in print_chained (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff6be0ec0,\r\n    message=message@entry=0x55555594b200 \u003ccontext_message\u003e \"During handling of the above exception, another exception occurred:\\n\",\r\n    tag=tag@entry=0x5555558deda0 \"context\") at Python/pythonrun.c:1254\r\n#16189 0x000055555582868e in print_exception_cause_and_context (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff6be0f30)\r\n    at Python/pythonrun.c:1344\r\n#16190 0x00005555558283d3 in print_exception_recursive (ctx=ctx@entry=0x7fffffffe270, value=value@entry=0x7ffff6be0f30) at Python/pythonrun.c:1482\r\n#16191 0x0000555555828969 in _PyErr_Display (file=file@entry=0x7ffff79ba7b0, exception=exception@entry=0x555555a75160 \u003c_PyExc_KeyboardInterrupt\u003e,\r\n    value=value@entry=0x7ffff6be0f30, tb=tb@entry=0x7ffff6c22ad0) at Python/pythonrun.c:1530\r\n#16192 0x0000555555828ad3 in PyErr_Display (exception=0x555555a75160 \u003c_PyExc_KeyboardInterrupt\u003e, value=0x7ffff6be0f30, tb=0x7ffff6c22ad0)\r\n    at Python/pythonrun.c:1562\r\n#16193 0x0000555555835660 in sys_excepthook_impl (module=module@entry=0x7ffff7947f50, exctype=\u003coptimized out\u003e, value=\u003coptimized out\u003e,\r\n    traceback=\u003coptimized out\u003e) at ./Python/sysmodule.c:748\r\n#16194 0x00005555558356c6 in sys_excepthook (module=0x7ffff7947f50, args=args@entry=0x7fffffffe3f0, nargs=nargs@entry=3)\r\n    at ./Python/clinic/sysmodule.c.h:102\r\n#16195 0x000055555572c28c in cfunction_vectorcall_FASTCALL (func=0x7ffff7948470, args=0x7fffffffe3f0, nargsf=\u003coptimized out\u003e, kwnames=\u003coptimized out\u003e)\r\n    at Objects/methodobject.c:422\r\n#16196 0x00005555556e1aa0 in _PyObject_VectorcallTstate (tstate=0x555555bd8808 \u003c_PyRuntime+468616\u003e, callable=callable@entry=0x7ffff7948470,\r\n    args=0x7fffffffe3f0, args@entry=0x7fffffffe360, nargsf=nargsf@entry=3, kwnames=kwnames@entry=0x0) at ./Include/internal/pycore_call.h:92\r\n#16197 0x00005555556e1b90 in _PyObject_FastCallTstate (nargs=3, args=0x7fffffffe360, func=0x7ffff7948470, tstate=\u003coptimized out\u003e)\r\n    at ./Include/internal/pycore_call.h:116\r\n#16198 _PyObject_FastCall (func=func@entry=0x7ffff7948470, args=args@entry=0x7fffffffe3f0, nargs=nargs@entry=3) at Objects/call.c:310\r\n#16199 0x0000555555828c2b in _PyErr_PrintEx (tstate=0x555555bd8808 \u003c_PyRuntime+468616\u003e, set_sys_last_vars=set_sys_last_vars@entry=1)\r\n    at Python/pythonrun.c:813\r\n#16200 0x0000555555828eb1 in PyErr_PrintEx (set_sys_last_vars=set_sys_last_vars@entry=1) at Python/pythonrun.c:861\r\n#16201 0x0000555555828ec1 in PyErr_Print () at Python/pythonrun.c:867\r\n#16202 0x00005555558293ab in _PyRun_SimpleFileObject (fp=fp@entry=0x555555bdb530, filename=filename@entry=0x7ffff77adbc0, closeit=closeit@entry=1,\r\n    flags=flags@entry=0x7fffffffe508) at Python/pythonrun.c:439\r\n#16203 0x000055555582951d in _PyRun_AnyFileObject (fp=fp@entry=0x555555bdb530, filename=filename@entry=0x7ffff77adbc0, closeit=closeit@entry=1,\r\n    flags=flags@entry=0x7fffffffe508) at Python/pythonrun.c:78\r\n#16204 0x00005555558487a5 in pymain_run_file_obj (program_name=program_name@entry=0x7ffff77c7370, filename=filename@entry=0x7ffff77adbc0,\r\n    skip_source_first_line=0) at Modules/main.c:360\r\n#16205 0x00005555558488cd in pymain_run_file (config=config@entry=0x555555bbd3c0 \u003c_PyRuntime+356928\u003e) at Modules/main.c:379\r\n#16206 0x0000555555849063 in pymain_run_python (exitcode=exitcode@entry=0x7fffffffe684) at Modules/main.c:610\r\n#16207 0x000055555584930f in Py_RunMain () at Modules/main.c:689\r\n#16208 0x0000555555849386 in pymain_main (args=args@entry=0x7fffffffe6e0) at Modules/main.c:719\r\n#16209 0x000055555584944c in Py_BytesMain (argc=\u003coptimized out\u003e, argv=\u003coptimized out\u003e) at Modules/main.c:743\r\n#16210 0x0000555555651772 in main (argc=\u003coptimized out\u003e, argv=\u003coptimized out\u003e) at ./Programs/python.c:15\r\n```\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-102078\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/chgnrdv","@type":"Person","name":"chgnrdv"},"datePublished":"2023-02-19T20:43:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/102056/cpython/issues/102056"}