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rustc hangs for a few minutes since recent Rust toolchain upgrade #546
Description
Looks like something hangs in spirv backend (rustc process) for many minutes after #543
It eventually finishes, but it takes many minutes doing something with a single CPU core, which is really annoying.
I do not remember this happening before that PR.
I am reproducing it with https://github.com/nazar-pc/abundance/tree/fc99af154c34202e3623ff0c318ee70f01f2f24e/crates/farmer/ab-proof-of-space-gpu, both cargo build and cargo clippy are affected.
Didn't measure it accurately, but feels like 3-5 minutes, while previously it took less than one.
Activity
LegNeato commentedon Mar 14, 2026
I'll take a look, thanks!
nazar-pc commentedon Mar 17, 2026
I must say this particular issue became quite frustrating after just a few days of not even working with GPU code
linker: batch mem2reg to process all variables in a single pass
linker: batch mem2reg to process all variables in a single pass
linker: batch mem2reg to process all variables in a single pass
linker: batch mem2reg to process all variables in a single pass
LegNeato commentedon Mar 18, 2026
Please try #547.
nazar-pc commentedon Mar 18, 2026
#547 is definitely a lot better
nazar-pc commentedon Apr 11, 2026
Closing since #552 just merged
Firestar99 commentedon Apr 13, 2026
@eddyb at #558
That could explain why this occured when we upgraded toolchain, and I assume 1.96 fixed it, which is why another toolchain upgrade fixed it.
eddyb commentedon Apr 13, 2026
The issue is still there on the latest nightly that godbolt has (
rustc 1.96.0-nightly (02c7f9bec 2026-04-10)).