Precompiling problem with PyPlot on 1.10-beta 1

[ctkelley]

I have an application that I’m using for a paper. The repo is at

https://github.com/ctkelley/N3Presults

I have an MWE (see below). This is breaking the collection of notebooks for a book. Everything works in 1.9.2 but on
1.10 beta 1 I get a infinirte loop of

[pid 13413] waiting for IO to finish:
 TYPE[FD/PID]       @UV_HANDLE_T->DATA
 timer              @0x6000037d4080->0x1051e9210

Is there a way to stop this? I have no idea why this started to happen today, but it did. MWE below

[ctkelley]

I have an mwe.

module mwe


using PyPlot


export xyzzy


function xyzzy()
println("hello")
end

end

With Julia 1.9.2 no problem. With 1.10beta1 complete failure.

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.9.2 (2023-07-05)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> using mwe

julia> xyzzy()
hello

but with 1.10 beta 1 I get

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.10.0-beta1 (2023-07-25)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> using mwe
[ Info: Precompiling mwe [top-level]

[pid 18751] waiting for IO to finish:
 TYPE[FD/PID]       @UV_HANDLE_T->DATA
 timer              @0x6000002a3980->0x1035f43d0

and it goes on forever.

If I take out using PyPlot it works.

[ufechner7]

Did you try to use PythonPlot instead?

[giordano]

Reported already at JuliaPy/PyPlot.jl#572. We discussed with Jameson about this at JuliaCon last week, it's likely a package bug.

[ctkelley]

Just tried PythonPlot and got the same problem.

MAC with M2 Pro

[ufechner7]

Well, I also saw these warnings, but so far everything worked fine for me despite these warnings...

I am using PythonPlot, and while the precompilation fails with an error, if you restart Julia and type using PythonPlot all works fine... I automated that in my build script.

[ctkelley]

The complaints went on forever and the compile never finished. PyPlot and PythonPlot behaved identically.

[ctkelley]

I just tried, taking @visr 's advice from #50706, but

julia> ENV["JULIA_NUM_PRECOMPILE_TASKS"]=1

did not solve the problem for me.

[giordano]

JuliaPy/PyPlot.jl#572 (comment)