Julia v1.11.3 and v1.10.8 stalling precompilation with [email protected]

[oschulz]

With Julia v1.11.3 (official binaries, tested on Ubuntu 22.04), precompilation of GaussianMixtures.jl stalls:

(@v1.11) pkg> add GaussianMixtures
Precompiling project...
[... dependency installation and precompilation ...]
  Progress [========================================>]  81/82
  ◒ GaussianMixtures

never finishes, but also show no errors (fresh Julia installation, starting with and empty package depot).

Everything is fine with Julia v1.11.2 and lower, so maybe some compiler bug in Julia v1.11.3?

System info:

Julia Version 1.11.3
Commit d63adeda50d (2025-01-21 19:42 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 20 × 13th Gen Intel(R) Core(TM) i9-13900H
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, goldmont)
Threads: 6 default, 0 interactive, 3 GC (on 20 virtual cores)

[nsajko]

Precompilation via using GaussianMixtures works fine for me.

Julia Version 1.11.3
Commit d63adeda50d (2025-01-21 19:42 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 8 × AMD Ryzen 3 5300U with Radeon Graphics
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver2)
Threads: 8 default, 0 interactive, 4 GC (on 8 virtual cores)

[nsajko]

Some possibly useful questions that come to mind:

• is julia using any CPU time while stalled
• how reproducible is this? what happens if you delete .julia/compiled/v1.11 and try precompiling again?

[oschulz]

how reproducible is this? what happens if you delete .julia/compiled/v1.11 and try precompiling again?

I do test this with a completely empty Julia package depot every time, of course.

Precompilation via using GaussianMixtures works fine for me.

It does now, interestingly, with [email protected], which was released about an hour ago. But I can perfectly reproduce it with [email protected].

Stalls forever on Julia v1.11.3, with 100% CPU load:

(@v1.11) pkg> add [email protected]

Done in a few seconds:

(@v1.11) pkg> add [email protected]

While the problem is "gone" now with [email protected], I think it should still be investigated, given that Julia v1.11.2 and lower has no problem with [email protected]. The difference is the commit davidavdav/GaussianMixtures.jl#115 which addresses the stalled-precompilation issue, but it doesn't look like the code was "incorrect" before - it's more like an empirical workaround. To to me it looks more like some compiler bug that triggered before somehow but isn't triggered after the changes. @BenCurran98 mentions in that PR that Julia v1.10.8 is also affected, while v1.10.7 seems to have been fine.

[KristofferC]

Most helpful here would be a bisect that would find the commit that introduced the stall.

[oschulz]

Most helpful here would be a bisect that would find the commit that introduced the stall.

Sorry, don't have the tooling set up to do a quick bisect. But I can reproduce the stalling-precompilation issue with Julia v1.11.3 and [email protected] on macOS (arm64-apple-darwin24.0.0) as well.

[nsajko]

It's #56640

[oschulz]

It's #56640

Thanks @nsajko - I guess we can close this then?

[nsajko]

I guess better wait until it's fixed

[oschulz]

I guess better wait until it's fixed

Oh, sorry - #56640 was the cause, not the fix - my bad. :-)

[N5N3]

I haven't found the MWE, but backporting #56007 fixes this locally.

[ViralBShah]

Closing since the fix is marked for backporting.

[oschulz]

Thanks again!