[Pkg-rust-maintainers] Bug#1051815: wasmedge - autopkgtest failure with rustc 1.68

[Peter Green]

On 12/09/2023 23:30, Faidon Liambotis wrote:
> Control: reassign -1 rustc 1.68.2+dfsg1-1
> Control: retitle -1 Builds invalid wasm32 binaries (1.67->1.68 regression)
>
> On Tue, Sep 12, 2023 at 10:56:57PM +0100, Peter Green wrote:
>> The autopkgtests for wasmedge fail with rustc 1.68, I have observed this with
>> both testing and unstable's versions of wasmedge, and with both testing and
>> unstable's versions of wasi-lib.
> Thanks for the report. Actually, I think the WasmEdge autopkgtests are
> catching a rustc 1.68 regression, whereas rustc compiles wasm32 binaries
> that do not work with neither WasmEdge, nor Wasmtime (the latter is not
> in Debian).
And it seems the issue persists with rustc 1.69 :(

https://ci.debian.net/data/autopkgtest/unstable/amd64/w/wasmedge/37797497/log.gz
>
> Very simple test case:
>
> $ podman run --rm -it debian:sid  # or bookworm to test with rustc 1.67
>
> root at ad697f1c195f:~# apt install rustc libstd-rust-dev-wasm32
> [...]
> root at ad697f1c195f:~# rustc -V
> rustc 1.68.2
> root at ad697f1c195f:~# cat > hello.rs <<EOF
> fn main() {
>      println!("Hello World!");
> }
> EOF
> root at ad697f1c195f:~# rustc --target=wasm32-wasi hello.rs
> root at ad697f1c195f:~#
>
> # execute the code with WasmEdge
> root at ad697f1c195f:~# apt install wasmedge
> [...]
> root at ad697f1c195f:~# wasmedge ./hello.wasm
> [2023-09-12 22:12:41.190] [error] execution failed: unreachable, Code: 0x89
> [2023-09-12 22:12:41.190] [error]     In instruction: unreachable (0x00) , Bytecode offset: 0x00009cd6
> [2023-09-12 22:12:41.190] [error]     When executing function name: "_start"
>
> # test with Wasmtime
> root at ad697f1c195f:~# apt install xz-utils wget
> [...]
> root at ad697f1c195f:~# wget -qO- https://github.com/bytecodealliance/wasmtime/releases/download/v12.0.1/wasmtime-v12.0.1-x86_64-linux.tar.xz | tar --wildcards --strip-components=1 -xJ  '*/wasmtime'
>
> root at ad697f1c195f:~# ./wasmtime hello.wasm
> Error: failed to run main module `hello.wasm`
>
> Caused by:
>      0: failed to invoke command default
>      1: error while executing at wasm backtrace:
>             0: 0x9cd6 - <unknown>!__stack_chk_fail
>             1: 0x9d3c - <unknown>!__wasilibc_init_ssp
>             2:  0x320 - <unknown>!__wasm_call_ctors
>             3:  0x342 - <unknown>!_start
>         note: using the `WASMTIME_BACKTRACE_DETAILS=1` environment variable may show more debugging information
>      2: wasm trap: wasm `unreachable` instruction executed
>
>
> Thanks,
> Faidon