Wasmtime was updated to reject creation of memories exactly 4gb in size in #3013, but the fuzzers still had the assumption that any request to create a host object for a particular wasm type would succeed. Unfortunately now, though, a request to create a 4gb memory fails. This is an expected failure, though, so the fix here was to catch the error and allow it.
Fuzzing Infrastructure for Wasmtime
This crate provides test case generators and oracles for use with fuzzing.
These generators and oracles are generally independent of the fuzzing engine
that might be using them and driving the whole fuzzing process (e.g. libFuzzer
or AFL). As such, this crate does not contain any actual fuzz targets
itself. Those are generally just a couple lines of glue code that plug raw input
from (for example) libFuzzer into a generator, and then run one or more
oracles on the generated test case.
If you're looking for the actual fuzz target definitions we currently have, they
live in wasmtime/fuzz/fuzz_targets/* and are driven by cargo fuzz and
libFuzzer.