Stream: wasmtime

Topic: FYI fuzzing has been busted for a month

view this post on Zulip Alex Crichton (Jan 05 2026 at 21:25):

Turns out fuzz builds are broken and probably have been broken for ~1 month since the last-tested revision for some open fuzz bugs is a month old.

My best guess for why we didn't get a notification is that our coverage build has been broken ~forever (expectedly) and they probably lump the two together. Alas.

Looking to fix this in https://github.com/google/oss-fuzz/pull/14753

Cause of this was https://github.com/bytecodealliance/wasmtime/pull/12119

Fix Wasmtime's fuzzer build by alexcrichton · Pull Request #14753 · google/oss-fuzz
A historical change last month turned out to break the build of our fuzzers due to new build requirements (wasm blobs built during the fuzzer build), so this adds the corresponding Rust targets to ...
Add a new fuzzer focused on component-model-async events by alexcrichton · Pull Request #12119 · bytecodealliance/wasmtime
This commit adds a new fuzzer mode to the misc fuzzer of Wasmtime which is focused on async events and interleavings of components using the component-model-async proposal. This fuzzer works by hav...

Last updated: Jan 09 2026 at 13:15 UTC