Can't terminate `notebook()` function in Julia REPL in 1.8 on Windows

[nilshg]

In 1.7.3 I can do:

julia> using IJulia

julia> notebook()
[ Info: running setenv(...)

# Single Ctrl+C

Process(setenv(..., ProcessSignaled(2))

julia> 

In 1.8-rc3 this doesn't work (tested on both cmd.exe and powershell):

julia> using IJulia

julia> notebook()
[ Info: running setenv(...)

# Single Ctrl+C

# Nothing happens

# Multiple Ctrl+Cs

WARNING: Force throwing a SIGINT

and the whole Julia session is dead.

[nilshg]

Edited to add that this isn't fixed by using 1.8 stable release. There's a related Pluto issue here: fonsp/Pluto.jl#2136

[benz0li]

Some slightly different results for Debian 11 (bullseye):

Julia 1.8.0, JupyterLab Terminal

julia> using IJulia

julia> notebook()
[ Info: running `/usr/local/bin/jupyter notebook`
^C^C^C^C^C^CWARNING: Force throwing a SIGINT
Process(setenv(`/usr/local/bin/jupyter notebook`; dir="/home/benz0li"), ProcessExited(0))

julia>

Julia 1.8.0, code-server (aka Code - OSS) Terminal, Julia REPL

julia> using IJulia

julia> notebook()
[ Info: running `/usr/local/bin/jupyter notebook`
^C
Process(setenv(`/usr/local/bin/jupyter notebook`; dir="/home/benz0li"), ProcessExited(0))

julia>

ℹ️ May be reproduced at https://demo.jupyter.b-data.ch or with docker run --rm -it -p 8888:8888 registry.gitlab.b-data.ch/jupyterlab/julia/pubtools

[fonsp]

I opened a Julia issue about a change in interrupt behaviour on Julia 1.8, which I suspect to be the cause here.

JuliaLang/julia#46635

So far I only have my result on MacOS, perhaps someone using a different OS could try to reproduce the issue, and leave a comment with their versioninfo()?

[fonsp]

In Pluto, we were able to work around this issue, see fonsp/Pluto.jl#2293 , maybe the same technique would also work for IJulia! See JuliaLang/julia#46635 for a discussion about this workaround and alternatives.

[JamesWrigley]

Is this still a problem? Unfortunately I don't use Windows so I can't test it myself.

[benz0li]

For Debian 11 (bullseye):

Julia 1.11.5, JupyterLab Terminal

julia> using IJulia

julia> notebook()
[ Info: running `/usr/local/bin/jupyter notebook`
^CProcess(setenv(`/usr/local/bin/jupyter notebook`; dir="/home/benz0li"), ProcessRunning)

julia>

Julia 1.11.5, code-server (aka Code - OSS) Terminal, Julia REPL

julia> using IJulia

julia> notebook()
[ Info: running `/usr/local/bin/jupyter notebook`
^C
Process(setenv(`/usr/local/bin/jupyter notebook`; dir="/home/benz0li"), ProcessRunning)

julia>

Looks OK [on Debian 11]. As a reference for what should happen.

ℹ️ May be reproduced at https://demo.jupyter.b-data.ch or with docker run --rm -it -p 8888:8888 glcr.b-data.ch/jupyterlab/julia/pubtools

[JamesWrigley]

Thanks, but this seems to be a Windows-only issue. Indeed it also works for me on Linux.

[nilshg]

I'd forgotten this issue exists, it seems fixed on 11.5:

~> julia --startup-file=no -q                                                                                                                                                                06/10/2025 09:27:03 AM
julia> using IJulia; notebook();
notebook = setenv(...)
# single Ctrl-C
julia>