Unable to restart kernel with the default interpreter with the standalone Windows installer

[dalthviz]

Problem Description

Trying to restart the kernel while using the default interpreter ends in the following being print in the console:

`Exception in thread Thread-8:
Traceback (most recent call last):
  File "D:\obj\windows-release\37amd64_Release\msi_python\zip_amd64\threading.py", line 926, in _bootstrap_inner
  File "D:\obj\windows-release\37amd64_Release\msi_python\zip_amd64\threading.py", line 870, in run
  File "C:\Users\dalth\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\comms\frontendcomm.py", line 124, in poll_thread
    self.poll_one()
  File "C:\Users\dalth\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\comms\frontendcomm.py", line 144, in poll_one
    self._comm_close(msg)
  File "C:\Users\dalth\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\comms\frontendcomm.py", line 241, in _comm_close
    self.close(comm_id)
  File "C:\Users\dalth\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\comms\frontendcomm.py", line 104, in close
    return super(FrontendComm, self).close(comm_id)
  File "C:\Users\dalth\AppData\Local\Programs\Spyder\pkgs\spyder_kernels\comms\commbase.py", line 173, in close
    self._comms[comm_id]['comm'].close()
  File "C:\Users\dalth\AppData\Local\Programs\Spyder\pkgs\ipykernel\comm\comm.py", line 118, in close
    self.kernel.comm_manager.unregister_comm(self)
  File "C:\Users\dalth\AppData\Local\Programs\Spyder\pkgs\ipykernel\comm\manager.py", line 54, in unregister_comm
    comm = self.comms.pop(comm.comm_id)
KeyError: 'b98c76c05e9e11ec8766f8a2d65bae71'

Although sometimes no message is printed but the kernel seems like is dead since when trying to interact with the Variable Explore a message appears:

Checked with a conda installed version and there seems like the kernel restart is working

What steps reproduce the problem?

1. Try to restart the kernel of the initial IPython Console launched with Spyder

What is the expected output? What do you see instead?

Versions

• Spyder version: 5.2.1 None
• Python version: 3.7.9 64-bit
• Qt version: 5.12.10
• PyQt5 version: 5.12.3
• Operating System: Windows 10

Dependencies

# Mandatory:
atomicwrites >=1.2.0          :  1.4.0 (OK)
chardet >=2.0.0               :  4.0.0 (OK)
cloudpickle >=0.5.0           :  2.0.0 (OK)
cookiecutter >=1.6.0          :  1.7.3 (OK)
diff_match_patch >=20181111   :  20200713 (OK)
intervaltree                  :  None (OK)
IPython >=7.6.0               :  7.30.1 (OK)
jedi >=0.17.2;<0.19.0         :  0.18.1 (OK)
jellyfish >=0.7               :  0.8.9 (OK)
jsonschema >=3.2.0            :  4.2.1 (OK)
keyring >=17.0.0              :  23.4.0 (OK)
nbconvert >=4.0               :  6.3.0 (OK)
numpydoc >=0.6.0              :  1.1.0 (OK)
paramiko >=2.4.0              :  2.8.1 (OK)
parso >=0.7.0;<0.9.0          :  0.8.3 (OK)
pexpect >=4.4.0               :  4.8.0 (OK)
pickleshare >=0.4             :  0.7.5 (OK)
psutil >=5.3                  :  5.8.0 (OK)
pygments >=2.0                :  2.10.0 (OK)
pylint >=2.5.0                :  2.12.2 (OK)
pyls_spyder >=0.4.0           :  0.4.0 (OK)
pylsp >=1.3.2;<1.4.0          :  1.3.3 (OK)
pylsp_black >=1.0.0           :  1.0.1 (OK)
qdarkstyle =3.0.2             :  3.0.2 (OK)
qstylizer >=0.1.10            :  0.2.1 (OK)
qtawesome >=1.0.2             :  1.1.1 (OK)
qtconsole >=5.2.1;<5.3.0      :  5.2.2 (OK)
qtpy >=1.5.0                  :  1.11.3 (OK)
rtree >=0.9.7                 :  0.9.7 (OK)
setuptools >=49.6.0           :  59.6.0 (OK)
sphinx >=0.6.6                :  4.3.1 (OK)
spyder_kernels >=2.2.0;<2.3.0 :  2.2.0 (OK)
textdistance >=4.2.0          :  4.2.2 (OK)
three_merge >=0.1.1           :  0.1.1 (OK)
watchdog                      :  2.1.6 (OK)
zmq >=17                      :  22.3.0 (OK)

# Optional:
cython >=0.21                 :  0.29.25 (OK)
matplotlib >=2.0.0            :  3.5.1 (OK)
numpy >=1.7                   :  1.19.3 (OK)
pandas >=1.1.1                :  1.3.5 (OK)
scipy >=0.17.0                :  1.7.3 (OK)
sympy >=0.7.3                 :  1.9 (OK)

[dalthviz]

Pinging @ccordoba12 and @impact27 (maybe you have some ideas of why this could be happening)

[ccordoba12]

Hmm, this is bad news. What happens if you enclose this line

spyder_kernels\comms\commbase.py", line 173

in a try/except KeyError and pass on the error? I think that should solve the problem.

[dalthviz]

Hmm, this is bad news. What happens if you enclose this line

spyder_kernels\comms\commbase.py", line 173

in a try/except KeyError and pass on the error? I think that should solve the problem.

Checked that but the problem persist

Also checked running on debug mode and this is what I'm getting when trying to restart the kernel in the log:

2021-12-17 10:50:58,728 [DEBUG] [traitlets] -> handle_close[f8e51e825f5011ecae9bf8a2d65bae71]({'header': {'msg_id': 'a9c1647a-693217bd498333ac1f3ed0a4_15000_414', 'msg_type': 'comm_close', 'username': 'username', 'session': 'a9c1647a-693217bd498333ac1f3ed0a4', 'date': datetime.datetime(2021, 12, 17, 15, 50, 58, 669705, tzinfo=tzutc()), 'version': '5.3'}, 'msg_id': 'a9c1647a-693217bd498333ac1f3ed0a4_15000_414', 'msg_type': 'comm_close', 'parent_header': {'msg_id': '6de7f0bb-83b363b4ca60eb0bd2794439_2320_155', 'msg_type': 'comm_msg', 'username': 'username', 'session': '6de7f0bb-83b363b4ca60eb0bd2794439', 'date': datetime.datetime(2021, 12, 17, 15, 50, 57, 899579, tzinfo=tzutc()), 'version': '5.3'}, 'metadata': {}, 'content': {'data': {}, 'comm_id': 'f8e51e825f5011ecae9bf8a2d65bae71'}, 'buffers': []})
2021-12-17 10:50:58,911 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:50:59,922 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:51:00,934 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:51:01,939 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:51:02,945 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:51:03,945 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:51:04,940 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:51:05,954 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std
2021-12-17 10:51:06,970 [DEBUG] [spyder_kernels.comms.commbase] -> Call to unconnected comm: flush_std

[impact27]

This would be solved by #16890 I think

[ccordoba12]

Trying to restart the kernel while using the default interpreter ends in the following being print in the console

This is going to be fixed when spyder-ide/spyder-kernels#362 is merged.