Repository: spyder-ide/spyder

Issue:
IPython kernel hangs when using other graphics backend than "inline"
<!--- **PLEASE READ:** When submitting here, please ensure you've completed the following checklist and checked the boxes to confirm. Issue reports without it may be closed. Thanks! --->

### Issue Report Checklist

* [x] Searched the [issues page](https://github.com/spyder-ide/spyder/issues?q=is%3Aissue) for similar reports
* [x] Read the relevant sections of the [Spyder Troubleshooting Guide](https://github.com/spyder-ide/spyder/wiki/Troubleshooting-Guide-and-FAQ) and followed its advice
* [x] Reproduced the issue after updating with ``conda update spyder`` (or ``pip``, if not using Anaconda)
* [ ] Could not reproduce inside ``jupyter qtconsole`` (if console-related)
* [x] Tried basic troubleshooting (if a bug/error)
    * [x] Restarted Spyder
    * [x] Reset preferences with ``spyder --reset``
    * [x] Reinstalled the latest version of [Anaconda](https://www.anaconda.com/download/)
    * [x] Tried the other applicable steps from the Troubleshooting Guide
* [x] Completed the **Problem Description**, **Steps to Reproduce** and **Version** sections below

## Problem Description

Potentially the same issue as: https://github.com/spyder-ide/spyder/issues/16400

When using a different graphics backend than "Inline", (i.e. Automatic or Qt5), the kernel hangs when running a script. 
Infrequently, it works as expected, but there doesn't seem to be a pattern to this. 
The kernel must be restarted to regain functionality. Interrupt does not work. 

### What steps reproduce the problem?

1. Set graphics backend to Automatic or Qt5
2. Run a script that produces a plot

### What is the expected output? What do you see instead?
Expected: A new plot window and any console output from the script
Actual: No plot window, no console output

## Versions
<!--- You can get this information from Help > About Spyder...
or (if Spyder won't launch) the "conda list" command
from the Anaconda Prompt/Terminal/command line. --->

* Spyder version: 5.4.3
* Python version: 3.9.17
* Qt version: 5.15.2
* PyQt version: 5.15.7
* Operating System name/version: Windows 10 22H2

### Dependencies
<!--- Please go to the menu entry Help > Dependencies,
press the Copy to clipboard button and paste below --->

```
# Mandatory:
atomicwrites >=1.2.0                             :  1.4.0 (OK)
chardet >=2.0.0                                  :  4.0.0 (OK)
cloudpickle >=0.5.0                              :  2.2.1 (OK)
cookiecutter >=1.6.0                             :  1.7.3 (OK)
diff_match_patch >=20181111                      :  20200713 (OK)
intervaltree >=3.0.2                             :  3.1.0 (OK)
IPython >=7.31.1,<9.0.0,!=8.8.0,!=8.9.0,!=8.10.0 :  8.12.2 (OK)
jedi >=0.17.2,<0.19.0                            :  0.18.1 (OK)
jellyfish >=0.7                                  :  0.9.0 (OK)
jsonschema >=3.2.0                               :  4.17.3 (OK)
keyring >=17.0.0                                 :  23.13.1 (OK)
nbconvert >=4.0                                  :  6.5.4 (OK)
numpydoc >=0.6.0                                 :  1.5.0 (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                                     :  5.9.0 (OK)
pygments >=2.0                                   :  2.15.1 (OK)
pylint >=2.5.0,<3.0                              :  2.16.2 (OK)
pylint_venv >=2.1.1                              :  2.3.0 (OK)
pyls_spyder >=0.4.0                              :  0.4.0 (OK)
pylsp >=1.7.2,<1.8.0                             :  1.7.2 (OK)
pylsp_black >=1.2.0                              :  1.2.1 (OK)
qdarkstyle >=3.0.2,<3.2.0                        :  3.0.2 (OK)
qstylizer >=0.2.2                                :  0.2.2 (OK)
qtawesome >=1.2.1                                :  1.2.2 (OK)
qtconsole >=5.4.2,<5.5.0                         :  5.4.2 (OK)
qtpy >=2.1.0                                     :  2.2.0 (OK)
rtree >=0.9.7                                    :  1.0.1 (OK)
setuptools >=49.6.0                              :  68.0.0 (OK)
sphinx >=0.6.6                                   :  5.0.2 (OK)
spyder_kernels >=2.4.3,<2.5.0                    :  2.4.4 (OK)
textdistance >=4.2.0                             :  4.2.1 (OK)
three_merge >=0.1.1                              :  0.1.1 (OK)
watchdog >=0.10.3                                :  2.1.6 (OK)
zmq >=22.1.0                                     :  23.2.0 (OK)

# Optional:
cython >=0.21                                    :  None (NOK)
matplotlib >=3.0.0                               :  3.7.1 (OK)
numpy >=1.7                                      :  1.24.3 (OK)
pandas >=1.1.1                                   :  2.0.3 (OK)
scipy >=0.17.0                                   :  1.11.1 (OK)
sympy >=0.7.3                                    :  1.11.1 (OK)

```



Discussion:
Hey @James-F1dev, thanks for reporting. I can't reproduce this problem on Linux.

@dalthviz, could you check this on Windows?
I, along with many of my students in a computational physics class, using macs, are also having this issue. Since this ticket and 16400 seem to have issues reproducing what is happening for us, I made a little video showing what I mean. It's here:

https://youtu.be/2HIiaCM5mr8

I did YouTube because I narrate over it. As for versions of other possible dependencies, all my students would have installed Anaconda 1-2 weeks ago, so everything else would have been fairly up to date. I haven't updated anything on my conda package besides Spyder and see the same thing. Hope that's helpful. 
> @dalthviz, could you check this on Windows?

I was unable to reproduce this using the Windows installer (Spyder 5.4.5) or an Anaconda installation using an env created with something like:
    
    conda create -n spyder-graphics -c conda-forge python=3.9 spyder pandas numpy matplotlib

* Code used while testing:

```python
import matplotlib.pyplot as plt
import numpy as np
from matplotlib import colors
from matplotlib.ticker import PercentFormatter

# Creating dataset
np.random.seed(23685752)
N_points = 10000
n_bins = 20

# Creating distribution
x = np.random.randn(N_points)
y = .8 ** x + np.random.randn(10000) + 25

# Creating histogram
fig, axs = plt.subplots(1, 1, figsize=(10, 7), tight_layout=True)

axs.hist(x, bins = n_bins)

# Show plot
plt.show()
```

* Env details:

<details>

```
# packages in environment at C:\Users\dalth\anaconda3\envs\spyder-graphics:
#
# Name                    Version                   Build  Channel
alabaster                 0.7.13             pyhd8ed1ab_0    conda-forge
arrow                     1.2.3              pyhd8ed1ab_0    conda-forge
astroid                   2.15.6           py39hcbf5309_0    conda-forge
asttokens                 2.2.1              pyhd8ed1ab_0    conda-forge
atomicwrites              1.4.1              pyhd8ed1ab_0    conda-forge
attrs                     23.1.0             pyh71513ae_1    conda-forge
autopep8                  2.0.4              pyhd8ed1ab_0    conda-forge
babel                     2.12.1             pyhd8ed1ab_1    conda-forge
backcall                  0.2.0              pyh9f0ad1d_0    conda-forge
backports                 1.0                pyhd8ed1ab_3    conda-forge
backports.functools_lru_cache 1.6.5              pyhd8ed1ab_0    conda-forge
bcrypt                    4.0.1            py39hf21820d_0    conda-forge
beautifulsoup4            4.12.2             pyha770c72_0    conda-forge
binaryornot               0.4.4                      py_1    conda-forge
black                     23.7.0           py39hcbf5309_1    conda-forge
bleach                    6.0.0              pyhd8ed1ab_0    conda-forge
brotli                    1.1.0                hcfcfb64_0    conda-forge
brotli-bin                1.1.0                hcfcfb64_0    conda-forge
brotli-python             1.1.0            py39h99910a6_0    conda-forge
bzip2                     1.0.8                h8ffe710_4    conda-forge
ca-certificates           2023.7.22            h56e8100_0    conda-forge
certifi                   2023.7.22          pyhd8ed1ab_0    conda-forge
cffi                      1.15.1           py39h68f70e3_3    conda-forge
chardet                   5.2.0            py39hcbf5309_0    conda-forge
charset-normalizer        3.2.0              pyhd8ed1ab_0    conda-forge
click                     8.1.7           win_pyh7428d3b_0    conda-forge
cloudpickle               2.2.1              pyhd8ed1ab_0    conda-forge
colorama                  0.4.6              pyhd8ed1ab_0    conda-forge
comm                      0.1.4              pyhd8ed1ab_0    conda-forge
contourpy                 1.1.0            py39h1f6ef14_0    conda-forge
cookiecutter              2.3.0              pyh1a96a4e_0    conda-forge
cryptography              41.0.3           py39hb6bd5e6_0    conda-forge
cycler                    0.11.0             pyhd8ed1ab_0    conda-forge
debugpy                   1.6.8            py39h99910a6_0    conda-forge
decorator                 5.1.1              pyhd8ed1ab_0    conda-forge
defusedxml                0.7.1              pyhd8ed1ab_0    conda-forge
diff-match-patch          20230430           pyhd8ed1ab_0    conda-forge
dill                      0.3.7              pyhd8ed1ab_0    conda-forge
docstring-to-markdown     0.12               pyhd8ed1ab_0    conda-forge
docutils                  0.20.1           py39hcbf5309_0    conda-forge
entrypoints               0.4                pyhd8ed1ab_0    conda-forge
exceptiongroup            1.1.3              pyhd8ed1ab_0    conda-forge
executing                 1.2.0              pyhd8ed1ab_0    conda-forge
flake8                    6.0.0              pyhd8ed1ab_0    conda-forge
fonttools                 4.42.1           py39ha55989b_0    conda-forge
freetype                  2.12.1               h546665d_1    conda-forge
gettext                   0.21.1               h5728263_0    conda-forge
glib                      2.76.4               h12be248_0    conda-forge
glib-tools                2.76.4               h12be248_0    conda-forge
gst-plugins-base          1.22.5               h001b923_1    conda-forge
gstreamer                 1.22.5               hb4038d2_1    conda-forge
icu                       72.1                 h63175ca_0    conda-forge
idna                      3.4                pyhd8ed1ab_0    conda-forge
imagesize                 1.4.1              pyhd8ed1ab_0    conda-forge
importlib-metadata        6.8.0              pyha770c72_0    conda-forge
importlib-resources       6.0.1              pyhd8ed1ab_0    conda-forge
importlib_metadata        6.8.0                hd8ed1ab_0    conda-forge
importlib_resources       6.0.1              pyhd8ed1ab_0    conda-forge
inflection                0.5.1              pyh9f0ad1d_0    conda-forge
intel-openmp              2023.2.0         h57928b3_49496    conda-forge
intervaltree              3.1.0              pyhd8ed1ab_1    conda-forge
ipykernel                 6.25.2             pyh60829e3_0    conda-forge
ipython                   8.15.0             pyh5737063_0    conda-forge
ipython_genutils          0.2.0                      py_1    conda-forge
isort                     5.12.0             pyhd8ed1ab_1    conda-forge
jaraco.classes            3.3.0              pyhd8ed1ab_0    conda-forge
jedi                      0.18.2             pyhd8ed1ab_0    conda-forge
jellyfish                 1.0.0            py39hf21820d_0    conda-forge
jinja2                    3.1.2              pyhd8ed1ab_1    conda-forge
jsonschema                4.19.0             pyhd8ed1ab_1    conda-forge
jsonschema-specifications 2023.7.1           pyhd8ed1ab_0    conda-forge
jupyter_client            8.3.1              pyhd8ed1ab_0    conda-forge
jupyter_core              5.3.1            py39hcbf5309_0    conda-forge
jupyterlab_pygments       0.2.2              pyhd8ed1ab_0    conda-forge
keyring                   24.2.0           py39hcbf5309_0    conda-forge
kiwisolver                1.4.5            py39h1f6ef14_0    conda-forge
krb5                      1.20.1               heb0366b_0    conda-forge
lazy-object-proxy         1.9.0            py39ha55989b_0    conda-forge
lcms2                     2.15                 h3e3b177_1    conda-forge
lerc                      4.0.0                h63175ca_0    conda-forge
libblas                   3.9.0              18_win64_mkl    conda-forge
libbrotlicommon           1.1.0                hcfcfb64_0    conda-forge
libbrotlidec              1.1.0                hcfcfb64_0    conda-forge
libbrotlienc              1.1.0                hcfcfb64_0    conda-forge
libcblas                  3.9.0              18_win64_mkl    conda-forge
libclang                  16.0.6          default_heb8d277_1    conda-forge
libclang13                16.0.6          default_hc80b9e7_1    conda-forge
libdeflate                1.18                 hcfcfb64_0    conda-forge
libffi                    3.4.2                h8ffe710_5    conda-forge
libglib                   2.76.4               he8f3873_0    conda-forge
libhwloc                  2.9.2           default_haede6df_1009    conda-forge
libiconv                  1.17                 h8ffe710_0    conda-forge
libjpeg-turbo             2.1.5.1              hcfcfb64_0    conda-forge
liblapack                 3.9.0              18_win64_mkl    conda-forge
libogg                    1.3.4                h8ffe710_1    conda-forge
libpng                    1.6.39               h19919ed_0    conda-forge
libsodium                 1.0.18               h8d14728_1    conda-forge
libspatialindex           1.9.3                h39d44d4_4    conda-forge
libsqlite                 3.43.0               hcfcfb64_0    conda-forge
libtiff                   4.5.1                h6c8260b_1    conda-forge
libvorbis                 1.3.7                h0e60522_0    conda-forge
libwebp                   1.3.1                hcfcfb64_0    conda-forge
libwebp-base              1.3.1                hcfcfb64_0    conda-forge
libxcb                    1.15                 hcd874cb_0    conda-forge
libxml2                   2.11.5               hc3477c8_1    conda-forge
libzlib                   1.2.13               hcfcfb64_5    conda-forge
m2w64-gcc-libgfortran     5.3.0                         6    conda-forge
m2w64-gcc-libs            5.3.0                         7    conda-forge
m2w64-gcc-libs-core       5.3.0                         7    conda-forge
m2w64-gmp                 6.1.0                         2    conda-forge
m2w64-libwinpthread-git   5.0.0.4634.697f757               2    conda-forge
markdown-it-py            3.0.0              pyhd8ed1ab_0    conda-forge
markupsafe                2.1.3            py39ha55989b_0    conda-forge
matplotlib                3.7.2            py39hcbf5309_0    conda-forge
matplotlib-base           3.7.2            py39ha3e071c_0    conda-forge
matplotlib-inline         0.1.6              pyhd8ed1ab_0    conda-forge
mccabe                    0.7.0              pyhd8ed1ab_0    conda-forge
mdurl                     0.1.0              pyhd8ed1ab_0    conda-forge
mistune                   3.0.1              pyhd8ed1ab_0    conda-forge
mkl                       2022.1.0           h6a75c08_874    conda-forge
more-itertools            10.1.0             pyhd8ed1ab_0    conda-forge
msys2-conda-epoch         20160418                      1    conda-forge
munkres                   1.1.4              pyh9f0ad1d_0    conda-forge
mypy_extensions           1.0.0              pyha770c72_0    conda-forge
nbclient                  0.8.0              pyhd8ed1ab_0    conda-forge
nbconvert                 7.8.0              pyhd8ed1ab_0    conda-forge
nbconvert-core            7.8.0              pyhd8ed1ab_0    conda-forge
nbconvert-pandoc          7.8.0              pyhd8ed1ab_0    conda-forge
nbformat                  5.9.2              pyhd8ed1ab_0    conda-forge
nest-asyncio              1.5.6              pyhd8ed1ab_0    conda-forge
numpy                     1.25.2           py39h816b6a6_0    conda-forge
numpydoc                  1.5.0              pyhd8ed1ab_0    conda-forge
openjpeg                  2.5.0                ha2aaf27_2    conda-forge
openssl                   3.1.2                hcfcfb64_0    conda-forge
packaging                 23.1               pyhd8ed1ab_0    conda-forge
pandas                    2.1.0            py39h32e6231_0    conda-forge
pandoc                    3.1.3                h57928b3_0    conda-forge
pandocfilters             1.5.0              pyhd8ed1ab_0    conda-forge
paramiko                  3.3.1              pyhd8ed1ab_0    conda-forge
parso                     0.8.3              pyhd8ed1ab_0    conda-forge
pathspec                  0.11.2             pyhd8ed1ab_0    conda-forge
pcre2                     10.40                h17e33f8_0    conda-forge
pexpect                   4.8.0              pyh1a96a4e_2    conda-forge
pickleshare               0.7.5                   py_1003    conda-forge
pillow                    10.0.0           py39ha9166d5_0    conda-forge
pip                       23.2.1             pyhd8ed1ab_0    conda-forge
pkgutil-resolve-name      1.3.10             pyhd8ed1ab_0    conda-forge
platformdirs              3.10.0             pyhd8ed1ab_0    conda-forge
pluggy                    1.3.0              pyhd8ed1ab_0    conda-forge
ply                       3.11                       py_1    conda-forge
prompt-toolkit            3.0.39             pyha770c72_0    conda-forge
prompt_toolkit            3.0.39               hd8ed1ab_0    conda-forge
psutil                    5.9.5            py39ha55989b_0    conda-forge
pthread-stubs             0.4               hcd874cb_1001    conda-forge
pthreads-win32            2.9.1                hfa6e2cd_3    conda-forge
ptyprocess                0.7.0              pyhd3deb0d_0    conda-forge
pure_eval                 0.2.2              pyhd8ed1ab_0    conda-forge
pycodestyle               2.10.0             pyhd8ed1ab_0    conda-forge
pycparser                 2.21               pyhd8ed1ab_0    conda-forge
pydocstyle                6.3.0              pyhd8ed1ab_0    conda-forge
pyflakes                  3.0.1              pyhd8ed1ab_0    conda-forge
pygments                  2.16.1             pyhd8ed1ab_0    conda-forge
pylint                    2.17.5             pyhd8ed1ab_0    conda-forge
pylint-venv               3.0.2              pyhd8ed1ab_0    conda-forge
pyls-spyder               0.4.0              pyhd8ed1ab_0    conda-forge
pynacl                    1.5.0            py39h09fa780_2    conda-forge
pyparsing                 3.0.9              pyhd8ed1ab_0    conda-forge
pyqt                      5.15.9           py39hb77abff_4    conda-forge
pyqt5-sip                 12.12.2          py39h99910a6_4    conda-forge
pyqtwebengine             5.15.9           py39h2f4a3f1_4    conda-forge
pysocks                   1.7.1              pyh0701188_6    conda-forge
python                    3.9.18          h4de0772_0_cpython    conda-forge
python-dateutil           2.8.2              pyhd8ed1ab_0    conda-forge
python-fastjsonschema     2.18.0             pyhd8ed1ab_0    conda-forge
python-lsp-black          1.3.0              pyhd8ed1ab_0    conda-forge
python-lsp-jsonrpc        1.0.0              pyhd8ed1ab_0    conda-forge
python-lsp-server         1.7.4              pyhd8ed1ab_0    conda-forge
python-lsp-server-base    1.7.4              pyhd8ed1ab_0    conda-forge
python-slugify            8.0.1              pyhd8ed1ab_1    conda-forge
python-tzdata             2023.3             pyhd8ed1ab_0    conda-forge
python_abi                3.9                      3_cp39    conda-forge
pytoolconfig              1.2.5              pyhd8ed1ab_0    conda-forge
pytz                      2023.3.post1       pyhd8ed1ab_0    conda-forge
pywin32                   304              py39h99910a6_2    conda-forge
pywin32-ctypes            0.2.2            py39hcbf5309_0    conda-forge
pyyaml                    6.0.1            py39ha55989b_0    conda-forge
pyzmq                     25.1.1           py39hea35a22_0    conda-forge
qdarkstyle                3.1                pyhd8ed1ab_0    conda-forge
qstylizer                 0.2.2              pyhd8ed1ab_0    conda-forge
qt-main                   5.15.8              h2c8576c_12    conda-forge
qt-webengine              5.15.8               h5b1ea0b_0    conda-forge
qtawesome                 1.2.3              pyhd8ed1ab_0    conda-forge
qtconsole                 5.4.4              pyhd8ed1ab_0    conda-forge
qtconsole-base            5.4.4              pyha770c72_0    conda-forge
qtpy                      2.4.0              pyhd8ed1ab_0    conda-forge
referencing               0.30.2             pyhd8ed1ab_0    conda-forge
requests                  2.31.0             pyhd8ed1ab_0    conda-forge
rich                      13.5.1             pyhd8ed1ab_0    conda-forge
rope                      1.9.0              pyhd8ed1ab_0    conda-forge
rpds-py                   0.10.2           py39hf21820d_0    conda-forge
rtree                     1.0.1            py39h09fdee3_2    conda-forge
setuptools                68.1.2             pyhd8ed1ab_0    conda-forge
sip                       6.7.11           py39h99910a6_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
snowballstemmer           2.2.0              pyhd8ed1ab_0    conda-forge
sortedcontainers          2.4.0              pyhd8ed1ab_0    conda-forge
soupsieve                 2.5                pyhd8ed1ab_1    conda-forge
sphinx                    7.2.5              pyhd8ed1ab_0    conda-forge
sphinxcontrib-applehelp   1.0.7              pyhd8ed1ab_0    conda-forge
sphinxcontrib-devhelp     1.0.5              pyhd8ed1ab_0    conda-forge
sphinxcontrib-htmlhelp    2.0.4              pyhd8ed1ab_0    conda-forge
sphinxcontrib-jsmath      1.0.1              pyhd8ed1ab_0    conda-forge
sphinxcontrib-qthelp      1.0.6              pyhd8ed1ab_0    conda-forge
sphinxcontrib-serializinghtml 1.1.9              pyhd8ed1ab_0    conda-forge
spyder                    5.4.5            py39hcbf5309_0    conda-forge
spyder-kernels            2.4.4           win_pyh7428d3b_0    conda-forge
stack_data                0.6.2              pyhd8ed1ab_0    conda-forge
tbb                       2021.10.0            h91493d7_0    conda-forge
text-unidecode            1.3                        py_0    conda-forge
textdistance              4.5.0              pyhd8ed1ab_0    conda-forge
three-merge               0.1.1              pyh9f0ad1d_0    conda-forge
tinycss2                  1.2.1              pyhd8ed1ab_0    conda-forge
tk                        8.6.12               h8ffe710_0    conda-forge
toml                      0.10.2             pyhd8ed1ab_0    conda-forge
tomli                     2.0.1              pyhd8ed1ab_0    conda-forge
tomlkit                   0.12.1             pyha770c72_0    conda-forge
tornado                   6.3.3            py39ha55989b_0    conda-forge
traitlets                 5.9.0              pyhd8ed1ab_0    conda-forge
typing-extensions         4.7.1                hd8ed1ab_0    conda-forge
typing_extensions         4.7.1              pyha770c72_0    conda-forge
tzdata                    2023c                h71feb2d_0    conda-forge
ucrt                      10.0.22621.0         h57928b3_0    conda-forge
ujson                     5.7.0            py39h99910a6_0    conda-forge
unicodedata2              15.0.0           py39ha55989b_0    conda-forge
unidecode                 1.3.6              pyhd8ed1ab_0    conda-forge
urllib3                   2.0.4              pyhd8ed1ab_0    conda-forge
vc                        14.3                h64f974e_17    conda-forge
vc14_runtime              14.36.32532         hfdfe4a8_17    conda-forge
vs2015_runtime            14.36.32532         h05e6639_17    conda-forge
watchdog                  3.0.0            py39hcbf5309_0    conda-forge
wcwidth                   0.2.6              pyhd8ed1ab_0    conda-forge
webencodings              0.5.1                      py_1    conda-forge
whatthepatch              1.0.5              pyhd8ed1ab_0    conda-forge
wheel                     0.41.2             pyhd8ed1ab_0    conda-forge
win_inet_pton             1.1.0              pyhd8ed1ab_6    conda-forge
wrapt                     1.15.0           py39ha55989b_0    conda-forge
xorg-libxau               1.0.11               hcd874cb_0    conda-forge
xorg-libxdmcp             1.1.3                hcd874cb_0    conda-forge
xz                        5.2.6                h8d14728_0    conda-forge
yaml                      0.2.5                h8ffe710_2    conda-forge
yapf                      0.40.1             pyhd8ed1ab_0    conda-forge
zeromq                    4.3.4                h0e60522_1    conda-forge
zipp                      3.16.2             pyhd8ed1ab_0    conda-forge
zstd                      1.5.5                h12be248_0    conda-forge
```

</details>

> I made a little video showing what I mean. It's here:
>
>https://youtu.be/2HIiaCM5mr8

Thank you for the video and feedback @AstroALee ! I think the video shows in a quite clear way that for some reason the IPython console can get stuck until further interaction with Spyder is done. Could something be causing to stop/pause processing things from the kernel until something gets focus @ccordoba12 ? It's quite strange but maybe some sort of race condition to update states between things in the IPython console could be happening 🤔


>Could something be causing to stop/pause processing things from the kernel until something gets focus

This reminded me of an important additional detail, which is that in the frozen/locked state, when you hit "restart kernel", the console output and plot window will flash up for a fraction of a second and then disappear when the kernel restarts. 
I have the same issue for spyder 5.4.3 on Ubuntu. It's as shown in the youtube video posted by @AstroALee: when clicking into the field in the upper right showing the working directory, and hitting Enter, execution of the script goes forward. Please let me know in case in can provide useful information. Since this is on Linux Ubuntu, I am not sure if it's actually https://github.com/spyder-ide/spyder/issues/16400.
Hey guys, sorry for not replied back before but it seems some changes in the IPykernel package will solve this problem soon (I'm talking about https://github.com/ipython/ipykernel/pull/1212). If that's the case, then we'll bump our requirement on that package in our next version (5.5.2), to be released in a couple of weeks.
@gica3618, could you try this workaround https://github.com/spyder-ide/spyder/issues/16400#issuecomment-922412038 and report back? Thanks!
Thank you @ccordoba12. Now looking closer at https://github.com/spyder-ide/spyder/issues/16400, I think it's a different issue from the one I have. I can restart the kernel even when choosing Backend "Automatic". The problem I have is exactly like described here and shown in the video by @AstroALee. I tried the workaround anyway, but it didn't solve the issue.
Hi @ccordoba12, my understanding is that https://github.com/ipython/ipykernel/pull/1212 only solves the kernel hanging after an exception is raised and the kernel starts aborting future requests (which doesn't actually happen in my tests in SpyderShell ~~for reasons I don't yet understand~~ *edit: because SpyderShell or some related widget/process sends an additional `is_complete_request` message to the kernel before the `execute_request` message - the eventloop exits due to the `is_complete_request` message, the abort stop method is called, and only then the `execute_request` message arrives*).

This issue seems to be the kernel getting stuck (potentially in the eventloop) without an exception, which shouldn't really be impacted by my PR, but may be an adjacent problem? The Tkinter (on Mac and Linux) and Qt (on any platform) ipykernel eventloops are set up to exit on a ZMQ socket event, which a call to execute code should produce I think? From what I can see in the YouTube video, perhaps the execution of the file fails to exit the eventloop and then setting the working directory sends a ZMQ message and exits correctly, resuming file execution? If this was the problem I'd expect it to be reproducible on any platform where the eventloops exit on socket event rather than every kernel interval (so on any platform for Qt, and Linux and Mac for Tkinter). I wasn't able to reproduce this behaviour on Windows, so this may be something quite different? I don't have access to a Mac, but could maybe try on Ubuntu...
Hey @jdranczewski, thanks a lot for chiming in and help us to understand better this problem!

> I wasn't able to reproduce this behaviour on Windows, so this may be something quite different?

Did you try it with the current IPykernel version? Or one that has the patch you developed in https://github.com/ipython/ipykernel/pull/1212? Just curious because it's not clear from your message.

> I don't have access to a Mac, but could maybe try on Ubuntu...

Ok, we'd really appreciate that, thanks!
I tried the current, unpatched version of IPykernel. Will do more testing over the weekend!
I've had some luck reproducing this on Windows under Qt by spamming the run button, which occasionally makes a bizarre interaction of the Tornado io_loop, the kernel's message queue, and the GUI loop occur, with the run call being put on the queue but the GUI loop kicking in before the run call can be processed. This manifests in the same way (the run call is put into the console and nothing happens until the kernel is prodded to exit the GUI loop, for example by setting the working directory), but feels much more localised to me mashing the run button than the issue as described originally.

@James-F1dev could you specifically confirm that this happens on Windows under Tkinter for you? The Qt and Tkinter loops work in very different ways on Windows, so this would be very useful to know. I know you said that Tkinter is also affected in your original report, but I am _very_ confused as to how this could happen under Tkinter on Windows (as it _should_ return focus to the main kernel thread every 10ms or so), so thought I'd double-check.

I think there is a fairly simple fix to the way IPykernel schedules GUI loop runs that we could implement, but it would be useful to pinpoint the issue first so we know this is for sure the problem. @James-F1dev @AstroALee @gica3618 sorry for the mass ping, but you seem to be able to reproduce this - if you feel like doing small surgery on your ipykernel installation (most likely in `lib/site-packages/ipykernel` in your Python installation/virtual environment folder) it would be super useful to know if applying the changes from https://github.com/jdranczewski/ipykernel/commit/30da44ab4d355ce82750743ef3cd89bed7912f21 resolves the issue for you. Thanks!
Thanks for your help @jdranczewski! Let's ask @dalthviz to try your fix because he's one of our core developers and was also able to reproduce this problem.

@dalthviz, could you do that? Thanks!
> @James-F1dev could you specifically confirm that this happens on Windows under Tkinter for you? The Qt and Tkinter loops work in very different ways on Windows, so this would be very useful to know. I know you said that Tkinter is also affected in your original report, but I am _very_ confused as to how this could happen under Tkinter on Windows (as it _should_ return focus to the main kernel thread every 10ms or so), so thought I'd double-check.
> 

Hi @jdranczewski yes you are completely correct, it appears that Tkinter is not subject to this issue. 
Only _automatic_ and _Qt5_ exhibit the behaviour described in my original post. 

Tkinter sometimes fails to produce the plot window, but does not hang the kernel. 
This is resolved simply by running the script again, so it seems like a separate and less severe issue. 

Thanks for looking at this. 
Hi there, although I initially was unable to reproduce this, checked @jdranczewski spamming the run button way to reproduce this and I was indeed able to reproduce :+1: 

![image](https://github.com/spyder-ide/spyder/assets/16781833/9d9a475e-1503-4a6b-a0e2-dbe3bd56ce83)

Also, applying the patch to `ipykernel` to my installation indeed seems like fixes things :tada: I'm even able to see some output from matplotlib related with memory consumption in the console due to the amount of plots being open:

![image](https://github.com/spyder-ide/spyder/assets/16781833/71358804-e796-4f02-9b79-26421f24d4cf)




I also tried @jdranczewski's fix, and it seems to work for me as well!
Thanks @dalthviz and @gica3618 for the confirmation!

The last thing left to be done then is to run our test suite against @jdranczewski pull request in IPykernel to check for possible regressions. I'll do that during the weekend.
This particular fix is not part of that PR yet, as it's a different issue (handling of call aborting in eventloops vs scheduling of eventloop calls), so I wasn't sure if I should bring it in there. I'll check with the maintainers over at IPykernel tomorrow (I still want to run some sanity checks) if they think this could be merged into one PR under the eventloop umbrella or if warrants a separate PR.

Resolving patch:
diff --git a/external-deps/spyder-kernels/setup.py b/external-deps/spyder-kernels/setup.py
--- a/external-deps/spyder-kernels/setup.py
+++ b/external-deps/spyder-kernels/setup.py
@@ -41,7 +41,7 @@ def get_version(module='spyder_kernels'):
     'cloudpickle',
     'ipykernel>=4.5,<5; python_version<"3"',
     'ipykernel>=6.16.1,<6.17; python_version<"3.8"',
-    'ipykernel>=6.23.2,<7; python_version>="3.8"',
+    'ipykernel>=6.29.3,<7; python_version>="3.8"',
     'ipython<6; python_version<"3"',
     'ipython>=7.31.1,<8; python_version<"3.8"',
     'ipython>=8.12.2,<8.13; python_version=="3.8"',
@@ -49,7 +49,7 @@ def get_version(module='spyder_kernels'):
     'jupyter-client>=5.3.4,<6; python_version<"3"',
     'jupyter-client>=7.4.9,<9; python_version>="3"',
     'pyzmq>=17,<20; python_version<"3"',
-    'pyzmq>=22.1.0; python_version>="3"',
+    'pyzmq>=24.0.0; python_version>="3"',
     'wurlitzer>=1.0.3;platform_system!="Windows"',
 ]
 
diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -234,7 +234,7 @@ def run(self):
     'pyqtwebengine>=5.10,<5.16',
     'python-lsp-server[all]>=1.10.0,<1.11.0',
     'pyxdg>=0.26;platform_system=="Linux"',
-    'pyzmq>=22.1.0',
+    'pyzmq>=24.0.0',
     'qdarkstyle>=3.2.0,<3.3.0',
     'qstylizer>=0.2.2',
     'qtawesome>=1.2.1',
diff --git a/spyder/dependencies.py b/spyder/dependencies.py
--- a/spyder/dependencies.py
+++ b/spyder/dependencies.py
@@ -62,7 +62,7 @@
 PYLSP_BLACK_REQVER = '>=2.0.0,<3.0.0'
 PYLS_SPYDER_REQVER = '>=0.4.0'
 PYXDG_REQVER = '>=0.26'
-PYZMQ_REQVER = '>=22.1.0'
+PYZMQ_REQVER = '>=24.0.0'
 QDARKSTYLE_REQVER = '>=3.2.0,<3.3.0'
 QSTYLIZER_REQVER = '>=0.2.2'
 QTAWESOME_REQVER = '>=1.2.1'


Test patch: