IJulia kernel doesn't work for Julia 1.6 on macOS

[carstenbauer]

I can't get the IJulia kernel to work when using Julia 1.6/master. Tried latest IJulia release and IJulia#master. The kernel either seems to not start all or die immediately.

Julia <= 1.5.3 kernels work just fine.

julia> versioninfo()
Julia Version 1.6.0-DEV.1661
Commit 56dd7d71a7* (2020-12-04 13:18 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.6.0)
  CPU: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.0 (ORCJIT, skylake)
Environment:
  JULIA_EDITOR = subl
  JULIA_NUM_THREADS = 6
  JULIA_PROJECT = /Users/crstnbr/.julia/environments/base
  JULIA_DQMC = /Users/crstnbr/sciebo/codes/julia-sdw-dqmc
  JULIA_PKG_SERVER = pkg.julialang.org

[stevengj]

Does the IJulia build succeed? Mine is failing due to JuliaLang/Pkg.jl#2270 (i.e. an unrelated Pkg issue)

[carstenbauer]

The build succeeds.

[stevengj]

Can you try turning on debugging output? https://julialang.github.io/IJulia.jl/stable/manual/troubleshooting/#Debugging-IJulia-problems

[carstenbauer]

Hm, I can't manage to get any useful debugging output. It seems like setting ENV["IJULIA_DEBUG"]=true doesn't do anything?

I removed all instances of IJulia (in ~/.julia/packages and ~/.julia/compiled) and used a fresh environment to add and build IJulia with the environmental variable set. When using IJulia.notebook() to start the jupyter server within the REPL I only get this output with no information whatsoever:

Starting the notebook server from the cmd directly (jupyter notebook) I only get

Is there something else that I could try?

[tomyun]

I have the same issue with IJulia 1.23.1 on Julia 1.6-DEV.1678.

Running jupyter notebook from terminal would get some messages like below:

[I 02:23:21.060 NotebookApp] Kernel started: 7d26ab67-be88-4e9d-ae9f-fe61be79db8b, name: julia-1.6
[I 02:23:27.059 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:23:33.068 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:23:39.073 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:23:45.079 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:23:51.088 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:23:57.097 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:24:03.108 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:24:09.116 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
[I 02:24:15.127 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports

Calling IJulia.notebook() on REPL would launch a notebook, but the kernel didn't work either.

julia> versioninfo()
Julia Version 1.6.0-DEV.1678
Commit 6eef7b69ab* (2020-12-06 20:10 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.5.0)
  CPU: Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.0 (ORCJIT, skylake)

[fredrikekre]

Julia master is currently pretty broken so I wouldn't be surprised if that is the problem here rather than IJulia.

[carstenbauer]

Julia master is currently pretty broken so I wouldn't be surprised if that is the problem here rather than IJulia.

If that's the case, fair enough. However, let me note that I see the same issue on the fresh 1.6 release branch. Isn't the latter supposed to be at least "beta" stable?

[carstenbauer]

Still seeing this for the 1.6 release branch. Any pointers to how I could investigate this further would be great.

[fredrikekre]

It works for me.

[carstenbauer]

It works for me.

Interesting... What OS are you on and what version of IJulia are you using?

[tomyun]

I tried it again with IJulia 1.23.1 on the latest Julia nightly (1.7.0-DEV.136), but still have the same issue. I'm on macOS.

julia> versioninfo()
Julia Version 1.7.0-DEV.136
Commit 549a73b99d (2020-12-22 08:49 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.5.0)
  CPU: Intel(R) Core(TM) i7-10700K CPU @ 3.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.0 (ORCJIT, skylake)

[carstenbauer]

Alright, I have tested julia#master (Version 1.7.0-DEV.197 (2020-12-30)) with IJulia v1.23.1 on Ubuntu 20.04, Windows 10, and macOS 11.1 (Big Sur, x86). As it turns out, everything works fine on linux and windows, so this appears to be a macOS issue. @fredrikekre I assume you're on linux or windows?

Given that @tomyun saw the same issue on macOS 10.15 Catalina I assume it's a "generic" macOS issue and not tied to a particular macOS version.

Any ideas how to debug/fix this?