[New-bugs-announce] [issue45748] "import ctypes" segfaults on Python 3.6 and Ubuntu 21.10

[Thomas Trummer]

New submission from Thomas Trummer <th.trummer at gmail.com>:

3.7 and later are all working fine.

First good commit: 55fe1ae9708d81b902b6fe8f6590e2a24b1bd4b0
First bad commit: fdbd01151dbd5feea3e4c0316d102db3d2a2a412


git checkout v3.6.15

#0  0x00007ffff6cc52a0 in PyCFuncPtr_new (type=0x5555559157f8, args=0x7ffff6ce6dd8, kwds=0x0)

    at /home/tom/pydev/cpython/Modules/_ctypes/_ctypes.c:3557

#1  0x00005555556400f9 in type_call (type=0x5555559157f8, args=0x7ffff6ce6dd8, kwds=0x0) at Objects/typeobject.c:895

#2  0x00005555555db4ca in _PyObject_FastCallDict (func=0x5555559157f8, args=0x7ffff6dc1f48, nargs=1, kwargs=0x0) at Objects/abstract.c:2331

#3  0x00005555556b8e7c in call_function (pp_stack=pp_stack at entry=0x7fffffffcb58, oparg=<optimized out>, kwnames=kwnames at entry=0x0)

    at Python/ceval.c:4875

#4  0x00005555556bc9d3 in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3335

#5  0x00005555556b774c in PyEval_EvalFrameEx (throwflag=0, f=0x7ffff6dc1dc8) at Python/ceval.c:754

#6  _PyFunction_FastCall (co=<optimized out>, args=<optimized out>, nargs=nargs at entry=0, globals=<optimized out>) at Python/ceval.c:4933

#7  0x00005555556b9269 in fast_function (kwnames=0x0, nargs=0, stack=<optimized out>, func=0x7ffff6d78378) at Python/ceval.c:4968

#8  call_function (pp_stack=pp_stack at entry=0x7fffffffccf8, oparg=<optimized out>, kwnames=kwnames at entry=0x0) at Python/ceval.c:4872

#9  0x00005555556bc9d3 in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3335

#10 0x00005555556b83c7 in PyEval_EvalFrameEx (throwflag=0, f=0x5555558d2248) at Python/ceval.c:754

#11 _PyEval_EvalCodeWithName (_co=_co at entry=0x7ffff6cdf660, globals=globals at entry=0x7ffff6dfa438, locals=locals at entry=0x7ffff6dfa438, 

    args=args at entry=0x0, argcount=argcount at entry=0, kwnames=kwnames at entry=0x0, kwargs=0x0, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, 

    closure=0x0, name=0x0, qualname=0x0, kwstep=2) at Python/ceval.c:4166

#12 0x00005555556b9a25 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0, args=0x0, 

    locals=0x7ffff6dfa438, globals=0x7ffff6dfa438, _co=0x7ffff6cdf660) at Python/ceval.c:4187

#13 PyEval_EvalCode (co=co at entry=0x7ffff6cdf660, globals=globals at entry=0x7ffff6dfa438, locals=locals at entry=0x7ffff6dfa438)

    at Python/ceval.c:731

#14 0x00005555556b611d in builtin_exec_impl (module=<optimized out>, locals=0x7ffff6dfa438, globals=0x7ffff6dfa438, source=0x7ffff6cdf660)

    at Python/bltinmodule.c:983

#15 builtin_exec (module=<optimized out>, args=<optimized out>) at Python/clinic/bltinmodule.c.h:283

#16 0x000055555562b651 in PyCFunction_Call (func=func at entry=0x7ffff6eb7990, args=args at entry=0x7ffff6cdcd08, kwds=kwds at entry=0x7ffff6d6b288)

    at Objects/methodobject.c:126

#17 0x00005555556c11af in do_call_core (kwdict=0x7ffff6d6b288, callargs=0x7ffff6cdcd08, func=0x7ffff6eb7990) at Python/ceval.c:5116

#18 _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at Python/ceval.c:3404

#19 0x00005555556b8d17 in PyEval_EvalFrameEx (throwflag=0, f=0x7ffff6dc2930) at Python/ceval.c:754

#20 _PyEval_EvalCodeWithName (_co=0x7ffff6eabdb0, globals=<optimized out>, locals=<optimized out>, args=<optimized out>, argcount=3, 

    kwnames=0x0, kwargs=0x7ffff6d913c8, kwcount=0, kwstep=1, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x7ffff6e53ad0, 

    qualname=0x7ffff6e53ad0) at Python/ceval.c:4166

----------
components: ctypes
messages: 405950
nosy: Thomas Trummer
priority: normal
severity: normal
status: open
title: "import ctypes" segfaults on Python 3.6 and Ubuntu 21.10
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45748>
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