Bug report

Bug summary

Python crashes when I create and then close figures in a for loop using the TkAgg backend on Mac OS X in an interactive session. The Python session crashes out with

called Tcl_FindHashEntry on deleted table
Abort trap: 6

This may be related to #7743 and #8387.

Code for reproduction

import sys
import matplotlib as mpl
import pylab as plt

print('OS: %s'%sys.platform)
print('matplotlib version: %s'%mpl.__version__)
print('Backend: %s'%matplotlib.get_backend())

for i in range(3):
    plt.figure()
    plt.close()

plt.figure()
plt.plot([0,1],[0,1])
plt.show()

Actual outcome

$ python -i figure_close.py
OS: darwin
matplotlib version: 2.0.2
Backend: TkAgg
called Tcl_FindHashEntry on deleted table
Abort trap: 6

Expected outcome

I would expect this code to create and destroy three figures before creating and retaining the last figure.

Matplotlib version

• Operating system: Mac OS X 10.12.1
• Matplotlib version: 2.0.2
• Matplotlib backend (print(matplotlib.get_backend())): TkAgg
• Python version: 2.7.13

This was matplotlib installed from conda from the conda-forge channel.