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Reading symbols from python...Reading symbols from /usr/lib/debug/.build-id/66/b65551cc62504bf758e2f57514d33cf3017b8f.debug...done.
done.

warning: core file may not match specified executable file.
[New LWP 29348]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/home/vagrant/.virtualenvs/VE_2/bin/python /home/vagrant/.virtualenvs/VE_2/bin/'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000000000041c912 in _PyType_Lookup (name=0x7f7155c5aed0, type=0x248a1f0) at ../Objects/typeobject.c:2528
2528    ../Objects/typeobject.c: No such file or directory.
(gdb) bt
#0  0x000000000041c912 in _PyType_Lookup (name='__class__', type=0x248a1f0) at ../Objects/typeobject.c:2528
#1  _PyObject_GenericGetAttrWithDict (obj=<StringIndex at remote 0x7f713263a950>, name='__class__', dict=0x0) at ../Objects/object.c:1389
#2  0x00000000004d7b08 in recursive_isinstance (cls=<type at remote 0x8f9920>, inst=<StringIndex at remote 0x7f713263a950>) at ../Objects/abstract.c:2905
#3  _PyObject_RealIsInstance (cls=<type at remote 0x8f9920>, inst=<StringIndex at remote 0x7f713263a950>) at ../Objects/abstract.c:3073
#4  type___instancecheck__.lto_priv.137 () at ../Objects/typeobject.c:615
#5  0x00000000004ae223 in PyObject_Call (kw=0x0, arg=(<StringIndex at remote 0x7f713263a950>,), func=<built-in method __instancecheck__ of type object at remote 0x8f9920>) at ../Objects/abstract.c:2546
#6  PyObject_CallFunctionObjArgs () at ../Objects/abstract.c:2773
#7  0x00000000004d6eca in PyObject_IsInstance (cls=<type at remote 0x8f9920>, inst=<StringIndex at remote 0x7f713263a950>) at ../Objects/abstract.c:2976
#8  builtin_isinstance.lto_priv () at ../Python/bltinmodule.c:2463
#9  0x00000000004bc3fa in call_function (oparg=<optimized out>, pp_stack=0x7ffde55af670) at ../Python/ceval.c:4350
#10 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#11 0x00000000004b9ab6 in PyEval_EvalCodeEx () at ../Python/ceval.c:3582
#12 0x00000000004c1e6f in fast_function (nk=<optimized out>, na=<optimized out>, n=3, pp_stack=0x7ffde55af870, func=<function at remote 0x7f71528017d0>) at ../Python/ceval.c:4445
#13 call_function (oparg=<optimized out>, pp_stack=0x7ffde55af870) at ../Python/ceval.c:4370
#14 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#15 0x00000000004d4c9d in gen_send_ex.isra.0.lto_priv () at ../Objects/genobject.c:85
#16 0x000000000055d20a in PyIter_Next (iter=<generator at remote 0x7f713b31c460>) at ../Objects/abstract.c:3120
#17 builtin_sum.lto_priv () at ../Python/bltinmodule.c:2347
#18 0x00000000004bc3fa in call_function (oparg=<optimized out>, pp_stack=0x7ffde55afa90) at ../Python/ceval.c:4350
#19 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#20 0x00000000004b9ab6 in PyEval_EvalCodeEx () at ../Python/ceval.c:3582
#21 0x00000000004c1e6f in fast_function (nk=<optimized out>, na=<optimized out>, n=3, pp_stack=0x7ffde55afc90, func=<function at remote 0x7f71528017d0>) at ../Python/ceval.c:4445
#22 call_function (oparg=<optimized out>, pp_stack=0x7ffde55afc90) at ../Python/ceval.c:4370
#23 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#24 0x00000000004d4c9d in gen_send_ex.isra.0.lto_priv () at ../Objects/genobject.c:85
#25 0x000000000055d20a in PyIter_Next (iter=<generator at remote 0x7f713b31c410>) at ../Objects/abstract.c:3120
#26 builtin_sum.lto_priv () at ../Python/bltinmodule.c:2347
#27 0x00000000004bc3fa in call_function (oparg=<optimized out>, pp_stack=0x7ffde55afeb0) at ../Python/ceval.c:4350
#28 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#29 0x00000000004b9ab6 in PyEval_EvalCodeEx () at ../Python/ceval.c:3582
#30 0x00000000004c1e6f in fast_function (nk=<optimized out>, na=<optimized out>, n=3, pp_stack=0x7ffde55b00b0, func=<function at remote 0x7f71528017d0>) at ../Python/ceval.c:4445
#31 call_function (oparg=<optimized out>, pp_stack=0x7ffde55b00b0) at ../Python/ceval.c:4370
#32 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#33 0x00000000004d4c9d in gen_send_ex.isra.0.lto_priv () at ../Objects/genobject.c:85
#34 0x000000000055d20a in PyIter_Next (iter=<generator at remote 0x7f713b31c3c0>) at ../Objects/abstract.c:3120
#35 builtin_sum.lto_priv () at ../Python/bltinmodule.c:2347
#36 0x00000000004bc3fa in call_function (oparg=<optimized out>, pp_stack=0x7ffde55b02d0) at ../Python/ceval.c:4350
#37 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#38 0x00000000004b9ab6 in PyEval_EvalCodeEx () at ../Python/ceval.c:3582
#39 0x00000000004c1e6f in fast_function (nk=<optimized out>, na=<optimized out>, n=3, pp_stack=0x7ffde55b04d0, func=<function at remote 0x7f71528017d0>) at ../Python/ceval.c:4445
#40 call_function (oparg=<optimized out>, pp_stack=0x7ffde55b04d0) at ../Python/ceval.c:4370
#41 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#42 0x00000000004d4c9d in gen_send_ex.isra.0.lto_priv () at ../Objects/genobject.c:85
#43 0x000000000055d20a in PyIter_Next (iter=<generator at remote 0x7f713b31c370>) at ../Objects/abstract.c:3120
#44 builtin_sum.lto_priv () at ../Python/bltinmodule.c:2347
#45 0x00000000004bc3fa in call_function (oparg=<optimized out>, pp_stack=0x7ffde55b06f0) at ../Python/ceval.c:4350
#46 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#47 0x00000000004b9ab6 in PyEval_EvalCodeEx () at ../Python/ceval.c:3582
#48 0x00000000004c1e6f in fast_function (nk=<optimized out>, na=<optimized out>, n=3, pp_stack=0x7ffde55b08f0, func=<function at remote 0x7f71528017d0>) at ../Python/ceval.c:4445
#49 call_function (oparg=<optimized out>, pp_stack=0x7ffde55b08f0) at ../Python/ceval.c:4370
#50 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#51 0x00000000004d4c9d in gen_send_ex.isra.0.lto_priv () at ../Objects/genobject.c:85
#52 0x000000000055d20a in PyIter_Next (iter=<generator at remote 0x7f713b31c320>) at ../Objects/abstract.c:3120
#53 builtin_sum.lto_priv () at ../Python/bltinmodule.c:2347
#54 0x00000000004bc3fa in call_function (oparg=<optimized out>, pp_stack=0x7ffde55b0b10) at ../Python/ceval.c:4350
#55 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#56 0x00000000004b9ab6 in PyEval_EvalCodeEx () at ../Python/ceval.c:3582
#57 0x00000000004c1e6f in fast_function (nk=<optimized out>, na=<optimized out>, n=3, pp_stack=0x7ffde55b0d10, func=<function at remote 0x7f71528017d0>) at ../Python/ceval.c:4445
#58 call_function (oparg=<optimized out>, pp_stack=0x7ffde55b0d10) at ../Python/ceval.c:4370
#59 PyEval_EvalFrameEx () at ../Python/ceval.c:2987
#60 0x00000000004d4c9d in gen_send_ex.isra.0.lto_priv () at ../Objects/genobject.c:85
#61 0x000000000055d20a in PyIter_Next (iter=<generator at remote 0x7f713b31c2d0>) at ../Objects/abstract.c:3120
#62 builtin_sum.lto_priv () at ../Python/bltinmodule.c:2347
#63 0x00000000004bc3fa in call_function (oparg=<optimized out>, pp_stack=0x7ffde55b0f30) at ../Python/ceval.c:4350
#64 PyEval_EvalFrameEx () at ../Python/ceval.c:2987