ipython crash

```
$ ipython
Python 3.6.0a1+ (default, Jun  1 2016, 18:41:38)
Type "copyright", "credits" or "license" for more information.

IPython 4.2.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]:
python3.6(11678,0x7fff7be8a300) malloc: *** error for object 0x105c41e20: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
zsh: abort      ipython
$
```