lxml crash

bt.txt

#0  0x00007ffff7a8219b in vgetargs1 () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#1  0x00007ffff7a83fe6 in PyArg_ParseTuple () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#2  0x00007ffff7a45487 in listpop.lto_priv () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#3  0x00007fffeab44430 in __Pyx_PyList_Pop (L=<optimized out>) at src/lxml/lxml.etree.c:145024
No locals.
#4  __pyx_f_4lxml_5etree_22_IncrementalFileWriter__write_end_element (__pyx_v_self=0x7fffe85ae830,
    __pyx_v_element_config=__pyx_v_element_config@entry=('http://xml.juniper.net/xnm/1.1/xnm', 'junoscript', [(None, 'version', '1.0')], {'http://xml.juniper.net/xnm/1.1/xnm': None})) at src/lxml/lxml.etree.c:13937
        __pyx_v_name = 0x0
        __pyx_v_prefix = 0x0
        __pyx_r = 0x0
        __pyx_t_1 = 0
        __pyx_t_2 = 0x0
        __pyx_t_3 = 0x0
        __pyx_t_4 = 1
        __pyx_t_5 = <optimized out>
        __pyx_t_6 = 0x0
        __pyx_t_7 = 0x0
        __pyx_t_8 = <optimized out>
#5  0x00007fffeab4482b in __pyx_pf_4lxml_5etree_18_FileWriterElement_4__exit__ (__pyx_v_exc_type=<optimized out>, __pyx_v_exc_val=<optimized out>,
    __pyx_v_exc_tb=<optimized out>, __pyx_v_self=0x7fffe7effa28) at src/lxml/lxml.etree.c:147221
        __pyx_t_2 = 0x0
        __pyx_r = 0x0
        __pyx_t_1 = ('http://xml.juniper.net/xnm/1.1/xnm', 'junoscript', [(None, 'version', '1.0')], {'http://xml.juniper.net/xnm/1.1/xnm': None})
        __pyx_t_3 = <optimized out>
#6  __pyx_pw_4lxml_5etree_18_FileWriterElement_5__exit__ (__pyx_v_self=<lxml.etree._FileWriterElement at remote 0x7fffe7effa28>, __pyx_args=(None, None, None),
    __pyx_kwds=<optimized out>) at src/lxml/lxml.etree.c:16125
        __pyx_v_exc_type = <optimized out>
        __pyx_v_exc_val = <optimized out>
        __pyx_v_exc_tb = <optimized out>
        __pyx_r = 0x0
#7  0x00007fffeaaccb2c in __Pyx_CyFunction_CallMethod (kw=0x0, arg=(None, None, None), self=<lxml.etree._FileWriterElement at remote 0x7fffe7effa28>,
    func=<cython_function_or_method at remote 0x7fffea7d8110>) at src/lxml/lxml.etree.c:235753
        f = 0x7fffea7d8110
        meth = 0x7fffeab447d0 <__pyx_pw_4lxml_5etree_18_FileWriterElement_5__exit__>
        size = <optimized out>
#8  __Pyx_CyFunction_CallAsMethod (func=<cython_function_or_method at remote 0x7fffea7d8110>, args=<optimized out>, kw=0x0) at src/lxml/lxml.etree.c:39202
        argc = <optimized out>
        new_args = (None, None, None)
        self = <lxml.etree._FileWriterElement at remote 0x7fffe7effa28>
        cyfunc = 0x7fffea7d8110
#9  0x00007ffff7a2bea3 in PyObject_Call () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#10 0x00007ffff7a76e7e in instancemethod_call.lto_priv () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#11 0x00007ffff7a2bea3 in PyObject_Call () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#12 0x00007ffff7a2de0f in PyObject_CallFunctionObjArgs () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#13 0x00007ffff7b0cc38 in PyEval_EvalFrameEx (Python Exception <class 'gdb.error'> There is no member named ob_ival.:
f=, throwflag=<optimized out>) at /usr/src/debug/Python-2.7.13/Python/ceval.c:3024
        exit_func = <instancemethod at remote 0x7fffe85ccb90>
        opcode_targets = {SNIP VERY LARGE LIST}
        stack_pointer = 0x555556296968
        next_instr = <optimized out>
        opcode = <optimized out>
        oparg = <optimized out>
        why = WHY_NOT
        err = <optimized out>
        x = None
        v = None
        w = None
        u = None
        t = <optimized out>
        stream = 0x0
        fastlocals = 0x555556296938
        freevars = <optimized out>
        retval = <optimized out>
        tstate = <optimized out>
        co = <optimized out>
        instr_ub = <optimized out>
        instr_lb = <optimized out>
        instr_prev = <optimized out>
        first_instr = <optimized out>
        names = <optimized out>
        consts = <optimized out>
#14 0x00007ffff79e9679 in gen_del.lto_priv.210.cold () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#15 0x00007ffff7a54784 in gen_dealloc.lto_priv () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#16 0x00007ffff7a48417 in PyDict_Clear () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#17 0x00007ffff7ad5089 in dict_tp_clear.lto_priv () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#18 0x00007ffff7a652bb in collect.lto_priv () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#19 0x00007ffff7acdd11 in PyGC_Collect () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#20 0x00007ffff7aeef4e in Py_Finalize () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#21 0x00007ffff7aef008 in Py_Exit () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#22 0x00007ffff7aef0cd in handle_system_exit () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#23 0x00007ffff7aef1b6 in PyErr_PrintEx () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#24 0x00007ffff7ada61d in RunModule () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#25 0x00007ffff7add0ed in Py_Main () from /lib64/libpython2.7.so.1.0
No symbol table info available.
#26 0x00007ffff6ca54da in __libc_start_main () from /lib64/libc.so.6
No symbol table info available.
#27 0x000055555555477a in _start ()
No symbol table info available.