1.12.0 - hang, memory leak in precompilation when downgrading loaded package

[BioTurboNick]

# delete compilation cache prior
]activate --temp
using CUDA #5.9.0 current version
]add CUDA@5.8.3

julia> versioninfo()
Julia Version 1.12.0
Commit b907bd0600 (2025-10-07 15:42 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 12 × Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, skylake)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 12 virtual cores)
Environment:
  JULIA_DEPOT_PATH = D:\.julia;

[BioTurboNick]

Ctrl+C successfully interrupts it, and calling GC.gc() is necessary to free memory.

[KristofferC]

I think #59635 fixes this so will be fixed in 1.12.1.

[BioTurboNick]

Confirmed fixed in 1.12.1