Rust 1.93 and leaking fds in libstd · rust-toolchain

Stream: rust-toolchain

Topic: Rust 1.93 and leaking fds in libstd

Alex Crichton (Feb 06 2026 at 22:23):

Looks like Rust 1.93 leaks file descriptors of std::fs::File due to an unfortunate series of events. I wanted to raise awareness here in case anyone sees this in the wild

"Out of memory" error when accessing files from wasm32-wasip2 in rust 1.93.0 · Issue #152255 · rust-lang/rust

Rust 1.93.0 stable produces wasm32-wasip2 components that are missing the fd_close import from wasi_snapshot_preview1. File descriptors are never released when File is dropped, exhausting the WASI ...

Alex Crichton (Feb 06 2026 at 22:36):

I'm inquiring if a fix for this can piggy-back on 1.93.1

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Alex Crichton (Feb 10 2026 at 18:19):

This is being fixed in Rust 1.93.1 (releasing in the next few days)

[stable] prepare Rust 1.93.1 by cuviper · Pull Request #152450 · rust-lang/rust

This includes the following backported fixes: Don't try to recover keyword as non-keyword identifier Don't try to recover keyword as non-keyword identifier #150590 Fix panicking_unwrap FP...

Last updated: Feb 24 2026 at 04:36 UTC