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Failed CI build for refs/heads/main

Status: Open.

#13523 In bytecodealliance/wasmtime;

· github-actions opened on Jun 1, 2026

Failed CI build for refs/heads/release-43.0.0

Status: Open.

#13522 In bytecodealliance/wasmtime;

· github-actions opened on Jun 1, 2026

Computationally large element segments timing out during fuzzing

fuzz-bugBugs found by a fuzzerBugs found by a fuzzer

wasm-proposal:gcIssues with the implementation of the gc wasm proposalIssues with the implementation of the gc wasm proposal

Status: Open.

#13521 In bytecodealliance/wasmtime;

· alexcrichton opened on May 31, 2026

Copying collector incremental GC does not handle cancellation of GC operation

fuzz-bugBugs found by a fuzzerBugs found by a fuzzer

wasm-proposal:gcIssues with the implementation of the gc wasm proposalIssues with the implementation of the gc wasm proposal

Status: Open.

#13516 In bytecodealliance/wasmtime;

· alexcrichton opened on May 30, 2026

Component model: host stream/future transmits leak when the guest drops its end while the host consumer/producer is HostReady

bugIncorrect behavior in the current implementation that needs fixingIncorrect behavior in the current implementation that needs fixing

Status: Open.

#13514 In bytecodealliance/wasmtime;

· gfx opened on May 30, 2026

Timer regression v44 => v45 for zero-delay timers?

bugIncorrect behavior in the current implementation that needs fixingIncorrect behavior in the current implementation that needs fixing

Status: Open.

#13507 In bytecodealliance/wasmtime;

· ignatz opened on May 29, 2026

Investigate adding a "fast init" function for initializing the VMContext

performance

wasmtimeIssues about wasmtime that don't fall into another labelIssues about wasmtime that don't fall into another label

Status: Open.

#13502 In bytecodealliance/wasmtime;

· alexcrichton opened on May 28, 2026

Deduplicate translation of constant expressions and general operators in func_environ.rs

wasmtimeIssues about wasmtime that don't fall into another labelIssues about wasmtime that don't fall into another label

Status: Open.

#13501 In bytecodealliance/wasmtime;

· alexcrichton opened on May 28, 2026

Propagate trapz backwards from ref.cast into the branch-y instance-of check that it emits

performance

wasm-proposal:gcIssues with the implementation of the gc wasm proposalIssues with the implementation of the gc wasm proposal

Status: Open.

#13485 In bytecodealliance/wasmtime;

· fitzgen opened on May 26, 2026

Expose type registry's supertypes arrays to Wasm, so it can do the O(1) subtype checks inline

performance

wasm-proposal:gcIssues with the implementation of the gc wasm proposalIssues with the implementation of the gc wasm proposal

Status: Open.

#13484 In bytecodealliance/wasmtime;

· fitzgen opened on May 26, 2026

Working with data derived from a GC ref and keeping the GC ref alive

craneliftIssues related to the Cranelift code generatorIssues related to the Cranelift code generator

cranelift:area:clif

wasm-proposal:gcIssues with the implementation of the gc wasm proposalIssues with the implementation of the gc wasm proposal

Status: Open.

#13482 In bytecodealliance/wasmtime;

· fitzgen opened on May 26, 2026

Cranelift 0.132 egraph stack-overflow on simple generic slice helper

Status: Open.

#13476 In bytecodealliance/wasmtime;

· hassard0 opened on May 25, 2026