importiowrapper=io.TextIOWrapper(io.BytesIO(b"x"))classCookie(int):def__new__(cls,wrapper):obj=int.__new__(cls,0)obj.wrapper=wrapperreturnobjdef__int__(self):self.wrapper.detach()return0wrapper.seek(Cookie(wrapper),io.SEEK_SET)

staticinttextiowrapper_parse_cookie(cookie_type*cookie,PyObject*cookieObj){unsignedcharbuffer[COOKIE_BUF_LEN];PyLongObject*cookieLong= (PyLongObject*)PyNumber_Long(cookieObj);if (cookieLong==NULL)return-1;if (_PyLong_AsByteArray(cookieLong,buffer,sizeof(buffer),PY_LITTLE_ENDIAN,0,1)<0) {Py_DECREF(cookieLong);return-1;    }Py_DECREF(cookieLong);memcpy(&cookie->start_pos,buffer+OFF_START_POS,sizeof(cookie->start_pos));memcpy(&cookie->dec_flags,buffer+OFF_DEC_FLAGS,sizeof(cookie->dec_flags));memcpy(&cookie->bytes_to_feed,buffer+OFF_BYTES_TO_FEED,sizeof(cookie->bytes_to_feed));memcpy(&cookie->chars_to_skip,buffer+OFF_CHARS_TO_SKIP,sizeof(cookie->chars_to_skip));memcpy(&cookie->need_eof,buffer+OFF_NEED_EOF,sizeof(cookie->need_eof));return0;}staticPyObject*_io_TextIOWrapper_seek_impl(textio*self,PyObject*cookieObj,intwhence)/*[clinic end generated code: output=0a15679764e2d04d input=4bea78698be23d7e]*/{PyObject*posobj;cookie_typecookie;PyObject*res;intcmp;PyObject*snapshot;CHECK_ATTACHED(self);CHECK_CLOSED(self);Py_INCREF(cookieObj);if (!self->seekable) {_unsupported(self->state,"underlying stream is not seekable");        gotofail;    }/* ... *//* The strategy of seek() is to go back to the safe start point     * and replay the effect of read(chars_to_skip) from there.     */if (textiowrapper_parse_cookie(&cookie,cookieObj)<0)        gotofail;/* Seek back to the safe start point. */posobj=PyLong_FromOff_t(cookie.start_pos);if (posobj==NULL)        gotofail;// self->buf has been set to nullres=PyObject_CallMethodOneArg(self->buffer,&_Py_ID(seek),posobj);

===================================================================1652913==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x5e52803ff39a bp 0x7fff1072a2c0 sp 0x7fff1072a200 T0)==1652913==The signal is caused by a READ memory access.==1652913==Hint: address points to the zero page.    #0 0x5e52803ff39a in _Py_TYPE Include/object.h:277    #1 0x5e52803ff39a in _PyObject_GetMethodStackRef Objects/object.c:1698    #2 0x5e528033f796 in PyObject_VectorcallMethod Objects/call.c:840    #3 0x5e52807f39a2 in PyObject_CallMethodOneArg Include/cpython/abstract.h:74    #4 0x5e52807fb66b in _io_TextIOWrapper_seek_impl Modules/_io/textio.c:2647    #5 0x5e52807fbe97 in _io_TextIOWrapper_seek Modules/_io/clinic/textio.c.h:938    #6 0x5e528035d6ed in method_vectorcall_FASTCALL Objects/descrobject.c:402    #7 0x5e528033de7f in _PyObject_VectorcallTstate Include/internal/pycore_call.h:169    #8 0x5e528033df72 in PyObject_Vectorcall Objects/call.c:327    #9 0x5e52805bc056 in _PyEval_EvalFrameDefault Python/generated_cases.c.h:1620    #10 0x5e52805ffe54 in _PyEval_EvalFrame Include/internal/pycore_ceval.h:121    #11 0x5e5280600148 in _PyEval_Vector Python/ceval.c:2001    #12 0x5e52806003f8 in PyEval_EvalCode Python/ceval.c:884    #13 0x5e52806f7507 in run_eval_code_obj Python/pythonrun.c:1365    #14 0x5e52806f7723 in run_mod Python/pythonrun.c:1459    #15 0x5e52806f857a in pyrun_file Python/pythonrun.c:1293    #16 0x5e52806fb220 in _PyRun_SimpleFileObject Python/pythonrun.c:521    #17 0x5e52806fb4f6 in _PyRun_AnyFileObject Python/pythonrun.c:81    #18 0x5e528074c74d in pymain_run_file_obj Modules/main.c:410    #19 0x5e528074c9b4 in pymain_run_file Modules/main.c:429    #20 0x5e528074e1b2 in pymain_run_python Modules/main.c:691    #21 0x5e528074e842 in Py_RunMain Modules/main.c:772    #22 0x5e528074ea2e in pymain_main Modules/main.c:802    #23 0x5e528074edb3 in Py_BytesMain Modules/main.c:826    #24 0x5e52801d2645 in main Programs/python.c:15    #25 0x7642c742a1c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58    #26 0x7642c742a28a in __libc_start_main_impl ../csu/libc-start.c:360    #27 0x5e52801d2574 in _start (/home/jackfromeast/Desktop/entropy/targets/grammar-afl++-latest/targets/cpython/python+0x2dd574) (BuildId: 202d5dbb945f6d5f5a66ad50e2688d56affd6ecb)AddressSanitizer can not provide additional info.SUMMARY: AddressSanitizer: SEGV Include/object.h:277 in _Py_TYPE==1652913==ABORTING