Traceback (most recent call first):
  <built-in method create_future of Loop object at remote 0x7f2b1df1c048>
  File "uvloop_test.py", line 13, in __del__
    self.loop.create_future()  # assertion fails here

#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f2b206c1231 in __GI_abort () at abort.c:79
#2  0x00007f2b206b89da in __assert_fail_base (fmt=0x7f2b2080bd48 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x637094 "func != NULL", 
    file=file@entry=0x636fc6 "../Objects/abstract.c", line=line@entry=2300, function=function@entry=0x6372d0 <__PRETTY_FUNCTION__.14709> "_PyObject_FastCallDict")
    at assert.c:92
#3  0x00007f2b206b8a52 in __GI___assert_fail (assertion=assertion@entry=0x637094 "func != NULL", file=file@entry=0x636fc6 "../Objects/abstract.c", line=line@entry=2300, 
    function=function@entry=0x6372d0 <__PRETTY_FUNCTION__.14709> "_PyObject_FastCallDict") at assert.c:101
#4  0x000000000044b55a in _PyObject_FastCallDict (func=0x0, args=args@entry=0x0, nargs=nargs@entry=0, kwargs=kwargs@entry=0x0) at ../Objects/abstract.c:2300
#5  0x00007f2b1e6dcf47 in future_init (fut=fut@entry=0x7f2b1e6697d8, loop=<optimized out>) at ./Modules/_asynciomodule.c:175
#6  0x00007f2b1e6dd0ac in _asyncio_Future___init___impl (self=self@entry=0x7f2b1e6697d8, loop=<optimized out>) at ./Modules/_asynciomodule.c:350
#7  0x00007f2b1e6dd0f2 in _asyncio_Future___init__ (self=<_asyncio.Future at remote 0x7f2b1e6697d8>, args=<optimized out>, kwargs=<optimized out>)
    at ./Modules/clinic/_asynciomodule.c.h:37
#8  0x00000000004b805b in type_call (type=0x7f2b1e8e5a40 <FutureType>, args=(), kwds={'loop': <Loop at remote 0x7f2b1df1c048>}) at ../Objects/typeobject.c:915
#9  0x00007f2b1dfa2953 in ?? () from /usr/lib/python3/dist-packages/uvloop/loop.cpython-36dm-x86_64-linux-gnu.so
#10 0x000000000049e10c in _PyCFunction_FastCallDict (func_obj=func_obj@entry=<built-in method create_future of Loop object at remote 0x7f2b1df1c048>, 
    args=args@entry=0x7f2b200ecf48, nargs=nargs@entry=0, kwargs=kwargs@entry=0x0) at ../Objects/methodobject.c:192
#11 0x000000000049e4f8 in _PyCFunction_FastCallKeywords (func=func@entry=<built-in method create_future of Loop object at remote 0x7f2b1df1c048>, 
    stack=stack@entry=0x7f2b200ecf48, nargs=nargs@entry=0, kwnames=kwnames@entry=0x0) at ../Objects/methodobject.c:294
#12 0x0000000000531d3f in call_function (pp_stack=pp_stack@entry=0x7ffe249a4698, oparg=oparg@entry=0, kwnames=kwnames@entry=0x0) at ../Python/ceval.c:4824
#13 0x000000000053c39e in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3322
#14 0x0000000000530d8d in PyEval_EvalFrameEx (
    f=f@entry=Frame 0x7f2b200ecdb0, for file uvloop_test.py, line 13, in __del__ (self=<LoopWrapper(loop=<Loop at remote 0x7f2b1df1c048>) at remote 0x7f2b1e6cb878>), 
    throwflag=throwflag@entry=0) at ../Python/ceval.c:753
#15 0x0000000000530e5d in _PyFunction_FastCall (co=co@entry=0x7f2b20349b80, args=0x7ffe249a4818, args@entry=0x7ffe249a4810, nargs=nargs@entry=1, 
    globals=globals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='uvloop_test.py') at remote 0x7f2b218da5a0>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7f2b219b1cd8>, '__cached__': None, 'asyncio': <module at remote 0x7f2b20326758>, 'sys': <module at remote 0x7f2b219d68d8>, 'uvloop': <module at remote 0x7f2b203265d8>, 'LoopWrapper': <type at remote 0x1ba03a8>, 'store_event_loop': <function at remote 0x7f2b20312c90>, 'event_loop': <Loop at remote 0x7f2b1df1c048>}) at ../Python/ceval.c:4906
#16 0x000000000053e14e in _PyFunction_FastCallDict (func=func@entry=<function at remote 0x7f2b1e33aeb8>, args=args@entry=0x7ffe249a4810, nargs=nargs@entry=1, 
    kwargs=kwargs@entry=0x0) at ../Python/ceval.c:5008
#17 0x000000000044b5cd in _PyObject_FastCallDict (func=func@entry=<function at remote 0x7f2b1e33aeb8>, args=args@entry=0x7ffe249a4810, nargs=nargs@entry=1, 
    kwargs=kwargs@entry=0x0) at ../Objects/abstract.c:2310
#18 0x000000000044b861 in _PyObject_Call_Prepend (func=<function at remote 0x7f2b1e33aeb8>, 
    obj=obj@entry=<LoopWrapper(loop=<Loop at remote 0x7f2b1df1c048>) at remote 0x7f2b1e6cb878>, args=args@entry=(), kwargs=kwargs@entry=0x0) at ../Objects/abstract.c:2373
#19 0x0000000000465855 in method_call (method=method@entry=<method at remote 0x7f2b20099058>, args=args@entry=(), kwargs=kwargs@entry=0x0) at ../Objects/classobject.c:317
#20 0x000000000044b4ae in _PyObject_FastCallDict (func=func@entry=<method at remote 0x7f2b20099058>, args=args@entry=0x0, nargs=nargs@entry=0, kwargs=kwargs@entry=0x0)
    at ../Objects/abstract.c:2331
#21 0x0000000000532436 in PyEval_CallObjectWithKeywords (func=func@entry=<method at remote 0x7f2b20099058>, args=args@entry=0x0, kwargs=kwargs@entry=0x0)
    at ../Python/ceval.c:4741
#22 0x00000000004bcb43 in slot_tp_finalize (self=<optimized out>) at ../Objects/typeobject.c:6450
#23 0x00000000004a07f2 in PyObject_CallFinalizer (self=self@entry=<LoopWrapper(loop=<Loop at remote 0x7f2b1df1c048>) at remote 0x7f2b1e6cb878>) at ../Objects/object.c:297
#24 0x00000000004a141b in PyObject_CallFinalizerFromDealloc (self=self@entry=<LoopWrapper(loop=<Loop at remote 0x7f2b1df1c048>) at remote 0x7f2b1e6cb878>)
    at ../Objects/object.c:314
#25 0x00000000004b25d1 in subtype_dealloc (self=self@entry=<LoopWrapper(loop=<Loop at remote 0x7f2b1df1c048>) at remote 0x7f2b1e6cb878>) at ../Objects/typeobject.c:1151
#26 0x00000000004a14cb in _Py_Dealloc (op=<LoopWrapper(loop=<Loop at remote 0x7f2b1df1c048>) at remote 0x7f2b1e6cb878>) at ../Objects/object.c:1791
#27 0x0000000000626fef in cell_dealloc (op=op@entry=0x7f2b1e3630b8) at ../Objects/cellobject.c:50
#28 0x00000000004a14cb in _Py_Dealloc (op=<cell at remote 0x7f2b1e3630b8>) at ../Objects/object.c:1791
#29 0x00000000004af2fd in tupledealloc (op=op@entry=0x7f2b1e6b5c20) at ../Objects/tupleobject.c:243
#30 0x00000000004a14cb in _Py_Dealloc (op=(<cell at remote 0x7f2b1e3630b8>,)) at ../Objects/object.c:1791
#31 0x000000000047c125 in func_dealloc (op=op@entry=0x7f2b1e36e840) at ../Objects/funcobject.c:535
#32 0x00000000004a14cb in _Py_Dealloc (op=op@entry=<function at remote 0x7f2b1e36e840>) at ../Objects/object.c:1791
#33 0x0000000000491c2f in insertdict (mp=mp@entry=0x7f2b219cdee0, key=key@entry='excepthook', hash=<optimized out>, value=value@entry=None) at ../Objects/dictobject.c:1181
#34 0x000000000049463f in PyDict_SetItem (
    op=op@entry={'__name__': None, '__doc__': None, '__package__': None, '__loader__': None, '__spec__': None, 'callstats': None, '_clear_type_cache': None, '_current_frames': None, 'displayhook': None, 'exc_info': None, 'excepthook': None, 'exit': <built-in method exit of module object at remote 0x7f2b219d68d8>, 'getdefaultencoding': <built-in method getdefaultencoding of module object at remote 0x7f2b219d68d8>, 'getdlopenflags': <built-in method getdlopenflags of module object at remote 0x7f2b219d68d8>, 'getallocatedblocks': <built-in method getallocatedblocks of module object at remote 0x7f2b219d68d8>, 'getfilesystemencoding': <built-in method getfilesystemencoding of module object at remote 0x7f2b219d68d8>, 'getfilesystemencodeerrors': <built-in method getfilesystemencodeerrors of module object at remote 0x7f2b219d68d8>, 'getobjects': <built-in method getobjects of module object at remote 0x7f2b219d68d8>, 'gettotalrefcount': <built-in method gettotalrefcount of module object at remote 0x7f2b219d68d8>, 'getrefcount': <bui...(truncated), key='excepthook', value=None) at ../Objects/dictobject.c:1575
#35 0x000000000049fc2a in _PyModule_ClearDict (
    d={'__name__': None, '__doc__': None, '__package__': None, '__loader__': None, '__spec__': None, 'callstats': None, '_clear_type_cache': None, '_current_frames': None, 'displayhook': None, 'exc_info': None, 'excepthook': None, 'exit': <built-in method exit of module object at remote 0x7f2b219d68d8>, 'getdefaultencoding': <built-in method getdefaultencoding of module object at remote 0x7f2b219d68d8>, 'getdlopenflags': <built-in method getdlopenflags of module object at remote 0x7f2b219d68d8>, 'getallocatedblocks': <built-in method getallocatedblocks of module object at remote 0x7f2b219d68d8>, 'getfilesystemencoding': <built-in method getfilesystemencoding of module object at remote 0x7f2b219d68d8>, 'getfilesystemencodeerrors': <built-in method getfilesystemencodeerrors of module object at remote 0x7f2b219d68d8>, 'getobjects': <built-in method getobjects of module object at remote 0x7f2b219d68d8>, 'gettotalrefcount': <built-in method gettotalrefcount of module object at remote 0x7f2b219d68d8>, 'getrefcount': <bui...(truncated)) at ../Objects/moduleobject.c:598
#36 0x0000000000556fd2 in PyImport_Cleanup () at ../Python/import.c:461
#37 0x0000000000424d8e in Py_FinalizeEx () at ../Python/pylifecycle.c:608
#38 0x000000000043b0f4 in Py_Main (argc=argc@entry=2, argv=argv@entry=0x1977260) at ../Modules/main.c:830
#39 0x000000000042111f in main (argc=2, argv=0x7ffe249a4df8) at ../Programs/python.c:69