Kernel dies when trying to plot an image with matplotlib

[astro-jingtao]

Describe the bug
Kernel dies when running plt.plot([0,1], [0,1])

To Reproduce
run this code

import matplotlib.pyplot as plt
plt.plot([0,1], [0,1])

Expected behavior
I expected matplotlib to plot the image

Desktop (please complete the following information):

• OS: windows 10
• Browser chrome
  

Additional context
From the console log of jupyter notebook:

ERROR:asyncio:Exception in callback <TaskWakeupMethWrapper object at 0x000001C6AC984F10>(<Future finis...d8a"\r\n\r\n'>)
handle: <Handle <TaskWakeupMethWrapper object at 0x000001C6AC984F10>(<Future finis...d8a"\r\n\r\n'>)>
Traceback (most recent call last):
  File "C:\Users\[myusername]\anaconda3\lib\asyncio\events.py", line 81, in _run
    self._context.run(self._callback, *self._args)
RuntimeError: Cannot enter into task <Task pending name='Task-10' coro=<HTTP1ServerConnection._server_request_loop() running at C:\Users\[myusername]\anaconda3\lib\site-packages\tornado\http1connection.py:823> wait_for=<Future finished result=b'GET /custom...fd8a"\r\n\r\n'> cb=[IOLoop.add_future.<locals>.<lambda>() at C:\Users\[myusername]\anaconda3\lib\site-packages\tornado\ioloop.py:688]> while another task <Task pending name='Task-147' coro=<KernelManager._async_start_kernel() running at C:\Users\[myusername]\anaconda3\lib\site-packages\jupyter_client\manager.py:336>> is being executed.

I have checked issue 6089 and 3709, not my case.

[kevin-bates]

Hi @MySlientWind - this may be more related to #6164 than matplotlib. Can you see if the workaround described there helps (i.e., using the AsyncMappingKernelManager)? (Thanks)

[astro-jingtao]

Hi @MySlientWind - this may be more related to #6164 than matplotlib. Can you see if the workaround described there helps (i.e., using the AsyncMappingKernelManager)? (Thanks)

Thanks for your reply, using the AsyncMappingKernelManager do fix the asyncio error but unfortunately plt.plot([0,1], [0,1]) still fail and kernel still die.

[astro-jingtao]

This error also exists when I use jupyter lab or vscode.

[astro-jingtao]

I found this is not a jupyter notebook issue but matplotlib issue, see following links for details

• https://stackoverflow.com/questions/69786885/after-conda-update-python-kernel-crashes-when-matplotlib-is-used
• [Bug]: Matplotlib crashes Python matplotlib/matplotlib#21511

The solution is conda install freetype=2.10.4