AIKIDO-2026-522246

TL;DR

When Wasmtime compiles a Wasm module that uses GC references together with try_call, a GC reference that stays live across the call may not be rooted. If the callee triggers a garbage collection while that reference is unrooted, the reference becomes dangling once collection runs, and using it afterward can corrupt the GC heap or cause incorrect execution. Both the GC and exceptions proposals are on by default, so any module that uses both is exposed. The fix adds the missing rooting for references live across try_call.