CI hanging while testing notebooks in FunctorCategories

[zickgraf]

Since yesterday (https://github.com/homalg-project/CategoricalTowers/actions/runs/5274719367/jobs/9539462031), the CI is timing out. The hang seems to happen while testing the notebooks in FunctorCategories. I suspect this is due to a bug triggered by Julia master. I don't know why the gap-docker-master job did not hang yesterday, it should be based on the same Julia version as gap-docker. But today it also hangs. FinSetsForCAP tests notebooks but is not affected by this, so the issue has to be specific to the kind of notebooks in FunctorCategories (maybe the graphs?).

I currently do not have the time to look into this. @mohamed-barakat Could you test the notebooks in FunctorCategories with latest Julia master and try to narrow down where the hang occurs (e.g., when printing graphs)?

[zickgraf]

HigherHomologicalAlgebra is also affected: https://github.com/zickgraf/HigherHomologicalAlgebra/actions/runs/5286161078/jobs/9565329237 But in this case, gap-docker did not hang while gap-docker-master did. So probably the issue is not 100% reproducible and the fact that gap-docker-master succeeded multiple times in CategoricalTowers yesterday was just coincidence.

[kamalsaleh]

Running the tests locally with the current julia master also hangs by the first test of a Jupyter notebook, in my case, FreydCategory_Qxy.ipynb, in ComplexesCategories.

Update: julia-master can load all the dependencies of CapAndHomalg but hangs when trying to load CapAndHomalg. The last stable release of Julia-1.9.1 loads everything without problems.

[zickgraf]

Thanks a lot @kamalsaleh for narrowing this down! I'm happy that this does not involve IJulia. Building on your observation, I have now bisected this to a Julia commit. Actually, already GAP.jl hangs (but not always, so probably by chance it did not show up in your tests). I have opened an issue: oscar-system/GAP.jl#901

[mohamed-barakat]

Thank you both very much for investigating :)

[zickgraf]

This is fixed: oscar-system/GAP.jl#901.