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Showing content from https://github.com/jupyterlab/jupyterlab/issues/16915 below:

cannot install jupyter on free-threaded Python build · Issue #16915 · jupyterlab/jupyterlab · GitHub

Starting jupyterlab on the free-threaded build on MacOS immediately segfaults. See jupyter/notebook#7512 for the same issue reported against notebook.

Install a free-threaded python on MacOS with developer tools installed (it may also happen on other operating systems), then do pip install jupyter and do jupyer lab, you'll see:

goldbaum at Nathans-MBP in ~/Documents
○  python -VV
Python 3.13.0 experimental free-threading build (main, Oct 10 2024, 10:28:54) [Clang 16.0.0 (clang-1600.0.26.3)]

goldbaum at Nathans-MBP in ~/Documents
○  jupyter lab
[1]    96654 segmentation fault  jupyter lab

This may be due to a depenency of jupyter not actually supporting the free-threaded build.

The jupyter CLI works fine, so maybe there is a way to abort before the seg fault to at least give users a better error message.

I'm unable to get a C stack trace for the segfault:

goldbaum at Nathans-MBP in ~/Documents
○  lldb $(pyenv which python) -- -m jupyter lab
(lldb) target create "/Users/goldbaum/.pyenv/versions/3.13.0t/bin/python"
Current executable set to '/Users/goldbaum/.pyenv/versions/3.13.0t/bin/python' (arm64).
(lldb) settings set -- target.run-args  "-m" "jupyter" "lab"
(lldb) r
Process 96490 launched: '/Users/goldbaum/.pyenv/versions/3.13.0t/bin/python' (arm64)
Process 96490 exited with status = 5 (0x00000005) Terminated due to signal 5
(lldb) bt
error: Command requires a process which is currently stopped.

jupyterlab starts

• Operating System and version: MacOS 14 on an M3 Macbook Pro
• Browser and version: N/A
• JupyterLab version: 4.2.5

sys.path:
/Users/goldbaum/.pyenv/versions/3.13.0t/bin
/Users/goldbaum/.pyenv/versions/3.13.0t/lib/python313t.zip
/Users/goldbaum/.pyenv/versions/3.13.0t/lib/python3.13t
/Users/goldbaum/.pyenv/versions/3.13.0t/lib/python3.13t/lib-dynload
/Users/goldbaum/.pyenv/versions/3.13.0t/lib/python3.13t/site-packages

sys.executable:
/Users/goldbaum/.pyenv/versions/3.13.0t/bin/python3.13t

sys.version:
3.13.0 experimental free-threading build (main, Oct 10 2024, 10:28:54) [Clang 16.0.0 (clang-1600.0.26.3)]

platform.platform():
macOS-14.7-arm64-arm-64bit-Mach-O

which -a jupyter:
/Users/goldbaum/.pyenv/versions/3.13.0t/bin/jupyter
/Users/goldbaum/.pyenv/shims/jupyter

pip list:
Package Version
------------------------- --------------
anyio 4.6.2.post1
appnope 0.1.4
argcomplete 3.5.1
argon2-cffi 23.1.0
argon2-cffi-bindings 21.2.0
arrow 1.3.0
asttokens 2.4.1
async-lru 2.0.4
attrs 24.2.0
babel 2.16.0
beautifulsoup4 4.12.3
bleach 6.2.0
certifi 2024.8.30
cffi 1.17.1
cfgv 3.4.0
charset-normalizer 3.4.0
colorlog 6.8.2
comm 0.2.2
debugpy 1.8.7
decorator 5.1.1
defusedxml 0.7.1
distlib 0.3.9
executing 2.1.0
fastjsonschema 2.20.0
filelock 3.16.1
fqdn 1.5.1
h11 0.14.0
httpcore 1.0.6
httpx 0.27.2
identify 2.6.1
idna 3.10
ipykernel 6.29.5
ipython 8.29.0
ipywidgets 8.1.5
isoduration 20.11.0
jedi 0.19.1
Jinja2 3.1.4
json5 0.9.25
jsonpointer 3.0.0
jsonschema 4.23.0
jsonschema-specifications 2024.10.1
jupyter 1.1.1
jupyter_client 8.6.3
jupyter-console 6.6.3
jupyter_core 5.7.2
jupyter-events 0.10.0
jupyter-lsp 2.2.5
jupyter_server 2.14.2
jupyter_server_terminals 0.5.3
jupyterlab 4.2.5
jupyterlab_pygments 0.3.0
jupyterlab_server 2.27.3
jupyterlab_widgets 3.0.13
MarkupSafe 3.0.2
matplotlib-inline 0.1.7
meson 1.5.2
meson-python 0.17.0
mistune 3.0.2
nbclient 0.10.0
nbconvert 7.16.4
nbformat 5.10.4
nest-asyncio 1.6.0
ninja 1.11.1.1
nodeenv 1.9.1
notebook 7.2.2
notebook_shim 0.2.4
nox 2024.10.9
overrides 7.7.0
packaging 24.1
pandocfilters 1.5.1
parso 0.8.4
pexpect 4.9.0
pip 24.2
platformdirs 4.3.6
pre_commit 4.0.1
prometheus_client 0.21.0
prompt_toolkit 3.0.48
psutil 6.1.0
ptyprocess 0.7.0
pure_eval 0.2.3
pycparser 2.22
Pygments 2.18.0
pyproject-metadata 0.8.1
python-dateutil 2.9.0.post0
python-json-logger 2.0.7
PyYAML 6.0.2
pyzmq 26.2.0
referencing 0.35.1
requests 2.32.3
rfc3339-validator 0.1.4
rfc3986-validator 0.1.1
rpds-py 0.20.1
ruff 0.7.0
Send2Trash 1.8.3
setuptools 75.3.0
six 1.16.0
sniffio 1.3.1
soupsieve 2.6
stack-data 0.6.3
terminado 0.18.1
test_datetime 0.0.1
tinycss2 1.4.0
tornado 6.4.1
traitlets 5.14.3
types-python-dateutil 2.9.0.20241003
uri-template 1.3.0
urllib3 2.2.3
virtualenv 20.26.6
wcwidth 0.2.13
webcolors 24.8.0
webencodings 0.5.1
websocket-client 1.8.0
widgetsnbextension 4.0.13

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