René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Type punning (and strict aliasing) issue in Py_CLEAR() and Py_SETREF() macros: Python --enable-pystats is miscompiled","articleBody":"# Bug report\r\n\r\nWhen building with `--enable-pystats`, the `ensurepip` step fails with a segmentation fault.\r\nThe v3.11.0 tag works on this machine, `main` is currently broken.  I have not yet bisected it.\r\n\r\nCc @markshannon as the primary pystats author.\r\n\r\n# Your environment\r\n\r\nDebian bookworm, WSL\r\n\r\n\u003cdetails\u003e\r\n\u003csummary\u003eOutput during build\u003c/summary\u003e\r\n\r\n```\r\nif test \"xupgrade\" != \"xno\"  ; then \\\r\n        case upgrade in \\                                                                                                               upgrade) ensurepip=\"--upgrade\" ;; \\\r\n                install|*) ensurepip=\"\" ;; \\\r\n        esac; \\                                                                                                                  ./python -E -m ensurepip \\\r\n                $ensurepip --root=/ ; \\\r\nfi\r\nLooking in links: /tmp/tmpnrufafo0\r\nProcessing /tmp/tmpnrufafo0/setuptools-65.5.0-py3-none-any.whl\r\nProcessing /tmp/tmpnrufafo0/pip-22.3.1-py3-none-any.whl\r\nInstalling collected packages: setuptools, pip                                                                          Traceback (most recent call last):\r\n  File \"\u003cfrozen runpy\u003e\", line 198, in _run_module_as_main\r\n  File \"\u003cfrozen runpy\u003e\", line 88, in _run_code\r\n  File \"/home/mdboom/Work/builds/cpython/Lib/ensurepip/__main__.py\", line 5, in \u003cmodule\u003e                                    sys.exit(ensurepip._main())                                                                                                      ^^^^^^^^^^^^^^^^^\r\n  File \"/home/mdboom/Work/builds/cpython/Lib/ensurepip/__init__.py\", line 286, in _main                                     return _bootstrap(\r\n           ^^^^^^^^^^^\r\n  File \"/home/mdboom/Work/builds/cpython/Lib/ensurepip/__init__.py\", line 202, in _bootstrap\r\n    return _run_pip([*args, *_PACKAGE_NAMES], additional_paths)                                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/home/mdboom/Work/builds/cpython/Lib/ensurepip/__init__.py\", line 103, in _run_pip\r\n    return subprocess.run(cmd, check=True).returncode                                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/home/mdboom/Work/builds/cpython/Lib/subprocess.py\", line 571, in run                                               raise CalledProcessError(retcode, process.args,                                                                     subprocess.CalledProcessError: Command '['/home/mdboom/Work/builds/cpython/python', '-W', 'ignore::DeprecationWarning', '-c', '\\nimport runpy\\nimport sys\\nsys.path = [\\'/tmp/tmpnrufafo0/setuptools-65.5.0-py3-none-any.whl\\', \\'/tmp/tmpnrufafo0/pip-22.3.1-py3-none-any.whl\\'] + sys.path\\nsys.argv[1:] = [\\'install\\', \\'--no-cache-dir\\', \\'--no-index\\', \\'--find-links\\', \\'/tmp/tmpnrufafo0\\', \\'--root\\', \\'/\\', \\'--upgrade\\', \\'setuptools\\', \\'pip\\']\\nrunpy.run_module(\"pip\", run_name=\"__main__\", alter_sys=True)\\n']' died with \u003cSignals.SIGSEGV: 11\u003e.\r\n```\r\n\u003c/details\u003e\r\n\r\n\u003cdetails\u003e\r\n\u003csummary\u003eBacktrace from the segfault\u003c/summary\u003e\r\n\r\n```\r\n#0  tee_next (to=0x7ffff5ba9040) at ./Modules/itertoolsmodule.c:998\r\n#1  0x0000555555897f66 in filterfalse_next (lz=0x7ffff5c109d0) at ./Modules/itertoolsmodule.c:4198\r\n#2  0x00005555557caf4e in map_next (lz=0x7ffff5c12a10) at Python/bltinmodule.c:1359\r\n#3  0x000055555589b10a in chain_next (lz=0x7ffff5c10640) at ./Include/object.h:135\r\n#4  0x000055555589b10a in chain_next (lz=0x7ffff5c129b0) at ./Include/object.h:135\r\n#5  0x00005555556551d7 in _PyEval_EvalFrameDefault (tstate=\u003coptimized out\u003e, frame=0x7ffff7fb9bd8,\r\n    throwflag=\u003coptimized out\u003e) at ./Include/object.h:135\r\n#6  0x00005555556bf0bd in _PyObject_VectorcallTstate (kwnames=0x0, nargsf=3, args=0x7fffffffd120,\r\n    callable=0x7ffff5c311c0, tstate=0x555555b98968 \u003c_PyRuntime+450344\u003e) at ./Include/internal/pycore_call.h:92\r\n#7  method_vectorcall (method=\u003coptimized out\u003e, args=0x7ffff5e11218, nargsf=\u003coptimized out\u003e, kwnames=0x0)\r\n    at Objects/classobject.c:89\r\n#8  0x0000555555656173 in do_call_core (use_tracing=\u003coptimized out\u003e, kwdict=0x0, callargs=0x7ffff5e11200,\r\n    func=0x7ffff72d1540, tstate=\u003coptimized out\u003e) at Python/ceval.c:2981\r\n#9  _PyEval_EvalFrameDefault (tstate=\u003coptimized out\u003e, frame=0x7ffff7fb9548, throwflag=\u003coptimized out\u003e)\r\n    at Python/generated_cases.c.h:3510\r\n#10 0x00005555557d3645 in _PyEval_EvalFrame (throwflag=\u003coptimized out\u003e, frame=\u003coptimized out\u003e, tstate=\u003coptimized out\u003e)\r\n    at ./Include/internal/pycore_ceval.h:88\r\n#11 _PyEval_Vector (args=0x0, argcount=0, kwnames=0x0, locals=0x7ffff7fb9308, func=0x7ffff7c65f80,\r\n    tstate=0x555555b98968 \u003c_PyRuntime+450344\u003e) at Python/ceval.c:2059\r\n#12 PyEval_EvalCode (co=co@entry=0x555555d4d720, globals=globals@entry=0x7ffff7a80040,\r\n    locals=locals@entry=0x7ffff7a80040) at Python/ceval.c:585\r\n#13 0x00005555557cc280 in builtin_exec_impl (module=\u003coptimized out\u003e, closure=\u003coptimized out\u003e, locals=0x7ffff7a80040,\r\n    globals=0x7ffff7a80040, source=0x555555d4d720) at Python/bltinmodule.c:1075\r\n#14 builtin_exec (module=\u003coptimized out\u003e, args=\u003coptimized out\u003e, nargs=\u003coptimized out\u003e, kwnames=\u003coptimized out\u003e)\r\n    at Python/clinic/bltinmodule.c.h:543\r\n#15 0x000055555571bd6b in cfunction_vectorcall_FASTCALL_KEYWORDS (func=0x7ffff7c242c0, args=0x7ffff7fb92d0,\r\n    nargsf=\u003coptimized out\u003e, kwnames=\u003coptimized out\u003e) at Objects/methodobject.c:438\r\n#16 0x00005555556bbd5c in _PyObject_VectorcallTstate (kwnames=0x7ffff7a80040, nargsf=\u003coptimized out\u003e,\r\n    args=0xfffc555598798768, callable=0x7ffff7c242c0, tstate=0x555555b98968 \u003c_PyRuntime+450344\u003e)\r\n    at ./Include/internal/pycore_call.h:92\r\n#17 PyObject_Vectorcall (callable=callable@entry=0x7ffff7c242c0, args=args@entry=0x7ffff7fb92d0,\r\n    nargsf=\u003coptimized out\u003e, kwnames=kwnames@entry=0x0) at Objects/call.c:301\r\n#18 0x0000555555651c3b in _PyEval_EvalFrameDefault (tstate=\u003coptimized out\u003e, frame=0x7ffff7fb9228,\r\n    throwflag=\u003coptimized out\u003e) at Python/generated_cases.c.h:2972\r\n#19 0x00005555557d3645 in _PyEval_EvalFrame (throwflag=\u003coptimized out\u003e, frame=\u003coptimized out\u003e, tstate=\u003coptimized out\u003e)\r\n    at ./Include/internal/pycore_ceval.h:88\r\n#20 _PyEval_Vector (args=0x0, argcount=0, kwnames=0x0, locals=0x7ffff7c580ee, func=0x7ffff7c65e40,\r\n    tstate=0x555555b98968 \u003c_PyRuntime+450344\u003e) at Python/ceval.c:2059\r\n#21 PyEval_EvalCode (co=co@entry=0x7ffff7c58030, globals=globals@entry=0x7ffff7c869c0,\r\n    locals=locals@entry=0x7ffff7c869c0) at Python/ceval.c:585\r\n#22 0x000055555582911c in run_eval_code_obj (locals=0x7ffff7c869c0, globals=0x7ffff7c869c0, co=0x7ffff7c58030,\r\n    tstate=0x555555b98968 \u003c_PyRuntime+450344\u003e) at Python/pythonrun.c:1702\r\n#23 run_mod (mod=\u003coptimized out\u003e, filename=filename@entry=0x7ffff7c8b870, globals=globals@entry=0x7ffff7c869c0,\r\n    locals=locals@entry=0x7ffff7c869c0, flags=flags@entry=0x7fffffffd798, arena=arena@entry=0x7ffff7bb3990)\r\n    at Python/pythonrun.c:1723\r\n#24 0x000055555582c192 in pyrun_file (flags=0x7fffffffd798, closeit=1, locals=0x7ffff7c869c0, globals=0x7ffff7c869c0,\r\n    start=257, filename=0x7ffff7c8b870, fp=\u003coptimized out\u003e) at Python/pythonrun.c:1617\r\n#25 _PyRun_SimpleFileObject (fp=fp@entry=0x555555c2f3a0, filename=filename@entry=0x7ffff7c8b870,\r\n    closeit=closeit@entry=1, flags=flags@entry=0x7fffffffd798) at Python/pythonrun.c:439\r\n#26 0x000055555582c810 in _PyRun_AnyFileObject (fp=0x555555c2f3a0, filename=filename@entry=0x7ffff7c8b870,\r\n    closeit=closeit@entry=1, flags=flags@entry=0x7fffffffd798) at Python/pythonrun.c:78\r\n```\r\n\u003c/details\u003e","author":{"url":"https://github.com/mdboom","@type":"Person","name":"mdboom"},"datePublished":"2022-11-22T17:22:49.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/99701/cpython/issues/99701"}