% RUST_BACKTRACE=1 target/debug/viceroy --adapt /Users/me/Desktop/main\ -scheduler=none.wasm
unreachable executed at adapter line 1555: assertion failed
2025-06-05T17:56:20.354549Z ERROR WebAssembly trapped: error while executing at wasm backtrace:
0: 0x173da - wit-component:adapter:wasi_snapshot_preview1!random_get
1: 0x18797 - wit-component:shim!adapt-wasi_snapshot_preview1-random_get
2: 0x459 - __wasi_random_get
at /Users/runner/work/tinygo/tinygo/lib/wasi-libc/libc-bottom-half/sources/__wasilibc_real.c:598:19
3: 0x47a - __getentropy
at /Users/runner/work/tinygo/tinygo/lib/wasi-libc/libc-bottom-half/sources/getentropy.c:11:13
4: 0xa01 - arc4random_buf
at /Users/runner/work/tinygo/tinygo/lib/wasi-libc/libc-top-half/sources/arc4random.c:101:13
5: 0xfa3 - arc4random
at /Users/runner/work/tinygo/tinygo/lib/wasi-libc/libc-top-half/sources/arc4random.c:138:5
6: 0x184d - runtime.hardwareRand
at /opt/homebrew/Cellar/tinygo/0.35.0/src/runtime/runtime_tinygowasm.go:106:29
- runtime.init#1
at /opt/homebrew/Cellar/tinygo/0.35.0/src/runtime/algorithm.go:27:22
- runtime.run
at /opt/homebrew/Cellar/tinygo/0.35.0/src/runtime/scheduler_none.go:16:9
- _start
at /opt/homebrew/Cellar/tinygo/0.35.0/src/runtime/runtime_wasmentry.go:20:5
7: 0x17bb6 - wit-component:adapter:wasi_snapshot_preview1!fastly:api/reactor#serve
Caused by:
wasm trap: wasm `unreachable` instruction executed
Stack backtrace:
0: std::backtrace_rs::backtrace::libunwind::trace
at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
1: std::backtrace_rs::backtrace::trace_unsynchronized
at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: std::backtrace::Backtrace::create
at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/backtrace.rs:331:13
3: anyhow::error::<impl core::convert::From<E> for anyhow::Error>::from
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/anyhow-1.0.98/src/backtrace.rs:27:14
4: <T as core::convert::Into<U>>::into
at /Users/me/.rustup/toolchains/1.83-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/convert/mod.rs:759:9
5: <T as wasmtime_types::prelude::IntoAnyhow>::into_anyhow
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-types-25.0.3/src/prelude.rs:74:9
6: wasmtime::runtime::trap::from_runtime_box
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/trap.rs:118:34
7: wasmtime::runtime::func::invoke_wasm_and_catch_traps::{{closure}}
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/func.rs:1610:28
8: core::result::Result<T,E>::map_err
at /Users/me/.rustup/toolchains/1.83-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/result.rs:856:27
9: wasmtime::runtime::func::invoke_wasm_and_catch_traps
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/func.rs:1610:9
10: wasmtime::runtime::func::Func::call_unchecked_raw
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/func.rs:1072:9
11: wasmtime::runtime::component::func::Func::call_raw
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/component/func.rs:468:13
12: wasmtime::runtime::component::func::typed::TypedFunc<Params,Return>::call_impl
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/component/func/typed.rs:207:17
13: wasmtime::runtime::component::func::typed::TypedFunc<Params,Return>::call_async::{{closure}}::{{closure}}
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/component/func/typed.rs:189:31
14: wasmtime::runtime::store::<impl wasmtime::runtime::store::context::StoreContextMut<T>>::on_fiber::{{closure}}::{{closure}}
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-25.0.3/src/runtime/store.rs:2107:34
15: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
at /Users/me/.rustup/toolchains/1.83-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/boxed.rs:2454:9
16: wasmtime_fiber::Suspend<Resume,Yield,Return>::execute::{{closure}}
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-fiber-25.0.3/src/lib.rs:201:62
17: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
at /Users/me/.rustup/toolchains/1.83-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/panic/unwind_safe.rs:272:9
18: std::panicking::try::do_call
at /Users/me/.rustup/toolchains/1.83-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/panicking.rs:557:40
19: std::panicking::try
at /Users/me/.rustup/toolchains/1.83-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/panicking.rs:520:19
20: std::panic::catch_unwind
at /Users/me/.rustup/toolchains/1.83-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/panic.rs:358:14
21: wasmtime_fiber::Suspend<Resume,Yield,Return>::execute
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-fiber-25.0.3/src/lib.rs:201:22
22: wasmtime_fiber::unix::fiber_start
at /Users/me/.cargo/registry/src/index.crates.io-6f17d22bba15001f/wasmtime-fiber-25.0.3/src/unix.rs:207:9
23: _wasmtime_fiber_start_25_0_3
2025-06-05T17:56:20.376644Z ERROR There was an error handling the request error while executing at wasm backtrace:
0: 0x173da - wit-component:adapter:wasi_snapshot_preview1!random_get
...same backtrace as up top.
A Fastly Compute project using the TinyGo SDK and having an empty
main()crashes when run underviceroy --adapt:Note that you need to pull in #489 to get code to successfully run under the adapter at all.
Truths
magic2magic number in theStatestruct.-scheduler=none. It is triggered by the presence of GC: a build using-scheduler=none -gc=leakingdoes not crash. (These can both be adjusted in fastly.toml's[scripts]section.)GOARCH=wasm GOOS=wasip1 go build -o bin/main.wasm ./)