Stefan Krah <ste...@bytereef.org> added the comment:
It looks like a compiler bug (line numbers are after macro expansion):
#0 0x00000000006ea678 in _PyEval_EvalFrameDefault (f=0x886d20
<_PyRuntime+352>, throwflag=-8) at Python/ceval.c:35554
#1 0x000000000057167b in _PyEval_EvalCodeWithName (_co=0x886d20
<_PyRuntime+352>, globals=0xfffffffffffffff8, locals=0xffffffffffffffff,
args=0x1, argcount=9370836, kwnames=0x0, kwargs=0x90bd90, kwcount=0, kwstep=1,
defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x8f05a0,
qualname=0x8f05a0) at Python/ceval.c:33634
#2 0x000000000043a693 in _PyFunction_FastCallKeywords (func=0x886d20
<_PyRuntime+352>, stack=0xfffffffffffffff8, nargs=-1, kwnames=0x1) at
Objects/call.c:433
#3 0x00000000006e65f5 in call_function (pp_stack=0x886d20 <_PyRuntime+352>,
oparg=-8, kwnames=0xffffffffffffffff) at Python/ceval.c:37762
#4 0x00000000006eb7a8 in _PyEval_EvalFrameDefault (f=0x886d20
<_PyRuntime+352>, throwflag=-8) at Python/ceval.c:36385
#5 0x000000000057167b in _PyEval_EvalCodeWithName (_co=0x886d20
<_PyRuntime+352>, globals=0xfffffffffffffff8, locals=0xffffffffffffffff,
args=0x1, argcount=9370836, kwnames=0x0, kwargs=0x0, kwcount=0, kwstep=2,
defs=0x0,
defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at
Python/ceval.c:33634
#6 0x0000000000571e41 in PyEval_EvalCodeEx (_co=0x886d20 <_PyRuntime+352>,
globals=0xfffffffffffffff8, locals=0xffffffffffffffff, args=0x1,
argcount=9370836, kws=0x0, kwcount=2, defs=0x0, defcount=0, kwdefs=0x0,
closure=0x0)
at Python/ceval.c:37166
#7 0x00000000006bdb95 in builtin___build_class__ (self=0x886d20
<_PyRuntime+352>, args=0xfffffffffffffff8, nargs=-1, kwnames=0x1) at
Python/bltinmodule.c:221
#8 0x000000000043a41e in _PyMethodDef_RawFastCallKeywords (method=0x886d20
<_PyRuntime+352>, self=0xfffffffffffffff8, args=0xffffffffffffffff, nargs=1,
kwnames=0x8efcd4) at Objects/call.c:656
#9 0x000000000043ada6 in _PyCFunction_FastCallKeywords (func=0x886d20
<_PyRuntime+352>, args=0xfffffffffffffff8, nargs=-1, kwnames=0x1) at
Objects/call.c:730
#10 0x00000000006e6a64 in call_function (pp_stack=0x886d20 <_PyRuntime+352>,
oparg=-8, kwnames=0xffffffffffffffff) at Python/ceval.c:37714
#11 0x00000000006eb7a8 in _PyEval_EvalFrameDefault (f=0x886d20
<_PyRuntime+352>, throwflag=-8) at Python/ceval.c:36385
#12 0x000000000057167b in _PyEval_EvalCodeWithName (_co=0x886d20
<_PyRuntime+352>, globals=0xfffffffffffffff8, locals=0xffffffffffffffff,
args=0x1, argcount=9370836, kwnames=0x0, kwargs=0x0, kwcount=0, kwstep=2,
defs=0x0,
defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at
Python/ceval.c:33634
#13 0x0000000000570c52 in PyEval_EvalCodeEx (_co=<optimized out>,
globals=<optimized out>, locals=<optimized out>, args=<optimized out>,
argcount=<optimized out>, kws=<optimized out>, kwcount=<optimized out>,
defs=<optimized out>, defcount=<optimized out>, kwdefs=<optimized out>,
closure=<optimized out>) at Python/ceval.c:37166
#14 PyEval_EvalCode (co=0x886d20 <_PyRuntime+352>, globals=0xfffffffffffffff8,
locals=0xffffffffffffffff) at Python/ceval.c:33611
#15 0x00000000005b20ba in exec_code_in_module (name=<optimized out>,
module_dict=<optimized out>, code_object=<optimized out>) at Python/import.c:952
#16 PyImport_ImportFrozenModuleObject (name=<optimized out>) at
Python/import.c:1357
#17 PyImport_ImportFrozenModule (name=0x886d20 <_PyRuntime+352> "\020\023\216")
at Python/import.c:1376
#18 0x00000000005ca1f7 in _Py_InitializeCore_impl (interp_p=0xfffffffffffffff8,
core_config=0xffffffffffffffff) at Python/pylifecycle.c:197
#19 0x00000000005c9be5 in _Py_InitializeCore (interp_p=0xfffffffffffffff8,
src_config=0xffffffffffffffff) at Python/pylifecycle.c:745
#20 0x0000000000429859 in pymain_init (pymain=0x886d20 <_PyRuntime+352>,
interp_p=0xfffffffffffffff8) at Modules/main.c:1733
#21 0x0000000000428ddf in pymain_main (pymain=<optimized out>) at
Modules/main.c:1753
#22 _Py_UnixMain (argc=8940832, argv=0xfffffffffffffff8) at Modules/main.c:1792
#23 0x00007ffff7c90f43 in __libc_start_main () from /lib64/libc.so.6
#24 0x000000000042652e in _start ()
In frame 13 argcount is still 0:
#13 0x0000000000570c52 in PyEval_EvalCodeEx (_co=<optimized out>,
globals=<optimized out>, locals=<optimized out>, args=<optimized out>,
argcount=<optimized out>, kws=<optimized out>, kwcount=<optimized out>,
defs=<optimized out>, defcount=<optimized out>, kwdefs=<optimized out>,
closure=<optimized out>) at Python/ceval.c:37166
37166 return _PyEval_EvalCodeWithName(_co, globals, locals,
(gdb) l
37161 PyObject *const *kws, int kwcount,
37162 PyObject *const *defs, int defcount,
37163 PyObject *kwdefs, PyObject *closure)
37164 {
37165 if (argcount != 0) abort();
37166 return _PyEval_EvalCodeWithName(_co, globals, locals,
37167 args, argcount,
37168 kws, kws != ((void*)0) ? kws + 1 :
((void*)0),
37169 kwcount, 2,
37170 defs, defcount,
In frame 12 it looks uninitialized:
(gdb) f 12
#12 0x000000000057167b in _PyEval_EvalCodeWithName (_co=0x886d20
<_PyRuntime+352>, globals=0xfffffffffffffff8, locals=0xffffffffffffffff,
args=0x1, argcount=9370836, kwnames=0x0, kwargs=0x0, kwcount=0, kwstep=2,
defs=0x0,
defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at
Python/ceval.c:33634
33634 return interp->eval_frame(f, throwflag);
So yes, if -fwrapv of all things prevents that, let's go for it.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40223>
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