Ziyue Jiang <ziyue.jian...@gmail.com> added the comment:
Maybe a little complicared but you can still construct a case to trigger the
double free action, thus causing a SIGABRT.
Program received signal SIGABRT, Aborted.
0x00007ffff7c3718b in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ffff7c3718b in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff7c16859 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x000000000051e94e in fatal_error (prefix=prefix@entry=0x0,
msg=msg@entry=0x6a38e4 "_PyObject_AssertFailed", status=status@entry=-1) at
../Python/pylifecycle.c:2183
#3 0x00000000005213b0 in Py_FatalError (msg=msg@entry=0x6a38e4
"_PyObject_AssertFailed") at ../Python/pylifecycle.c:2193
#4 0x0000000000470dd9 in _PyObject_AssertFailed (obj=obj@entry=0x7ffff789c350,
expr=expr@entry=0x0, msg=msg@entry=0x6a392d "object has negative ref count",
file=file@entry=0x691111 "../Include/object.h", line=line@entry=541,
function=function@entry=0x6a4a20 <__func__.15840> "_Py_NegativeRefcount")
at ../Objects/object.c:2200
#5 0x0000000000470ee1 in _Py_NegativeRefcount
(filename=filename@entry=0x691111 "../Include/object.h",
lineno=lineno@entry=541, op=op@entry=0x7ffff789c350) at ../Objects/object.c:235
#6 0x0000000000490ad8 in _Py_DECREF (op=0x7ffff789c350, lineno=541,
filename=0x691111 "../Include/object.h") at ../Include/object.h:473
#7 _Py_XDECREF (op=0x7ffff789c350) at ../Include/object.h:541
#8 type_mro_modified (type=type@entry=0xb17400,
bases=bases@entry=0x7ffff5917890) at ../Objects/typeobject.c:343
#9 0x00000000004940ca in mro_internal (type=type@entry=0xb17400,
p_old_mro=p_old_mro@entry=0x0) at ../Objects/typeobject.c:1961
#10 0x000000000048c816 in PyType_Ready (type=type@entry=0xb17400) at
../Objects/typeobject.c:5345
#11 0x0000000000493974 in type_new (metatype=<optimized out>, args=<optimized
out>, kwds=0x0) at ../Objects/typeobject.c:2806
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44588>
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