Tkinter crash with large figure

[lamorton]

I plotted the entirety of one BES channel, which bogged down the plot window due to the amount of data. It was slow but workable. Then this happened:

In [22]: /usr/pppl/anaconda3/5.1.0/lib/python3.6/site-packages/matplotlib/font_manager.py:1328: UserWarning: findfont: Font family ['sans-dejavu'] not found. Falling back to DejaVu Sans
  (prop.get_family(), self.defaultFamily[fontext]))
In [22]: from scipy.signal import csd

In [23]: /usr/pppl/anaconda3/5.1.0/lib/python3.6/site-packages/matplotlib/font_manager.py:1328: UserWarning: findfont: Font family ['sans-dejavu'] not found. Falling back to DejaVu Sans
  (prop.get_family(), self.defaultFamily[fontext]))
In [23]: 

Exception ignored in: <bound method Image.__del__ of <tkinter.PhotoImage object at 0x7f4b2cbc50b8>>
Traceback (most recent call last):
  File "/usr/pppl/anaconda3/5.1.0/lib/python3.6/tkinter/__init__.py", line 3501, in __del__
In [23]: dark=nstxu.s138755.bes.ch01[tTcl_AsyncDelete: async handler deleted by the wrong thread
Abort
[lmorton@sunfire04]% 

As you can see, I was in the middle of typing a command dark=nstxu.s138755.bes.ch01[t and then the error hit Tcl_AsyncDelete: async handler deleted by the wrong thread Abort

It might be related to this: gboeing/osmnx#75

I haven't been able to reproduce it.