FreeBSD: wasmer hangs after running WASM file

[MalloryA]

wasmer executes WASM files correctly, but after execution it hangs for around a minute before exiting.

% uname -a
FreeBSD athena 13.1-RELEASE-p3 FreeBSD 13.1-RELEASE-p3 GENERIC amd64
% echo "`./target/release/wasmer -V` | `rustc -V` | `uname -m`" 
wasmer 3.0.1 | rustc 1.63.0 (4b91a6ea7 2022-08-08) | amd64
% git show --oneline
a7defaf11a (HEAD -> master, origin/staging, origin/master, origin/HEAD) Merge #3365

Steps to reproduce

(gmake is GNU Make from package gmake, rust is installed via rustup and not from the FreeBSD rust package)

% gmake build-wasmer
% fetch https://registry-cdn.wapm.io/contents/syrusakbary/cowsay/0.2.0/target/wasm32-wasi/release/cowsay.wasm
% time ./target/release/wasmer cowsay.wasm -- hello world          

Expected behavior

The cow says "hello world" and the program immediately exits. It should take a fraction of a second (and it does when I run the same command on macOS).

Actual behavior

The cow says "hello world" within a second, then the process hangs for 55 seconds. The fact that time reports 100% cpu is unusual too.

% time ./target/release/wasmer cowsay.wasm -- hello world          
 _____________
< hello world >
 -------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
               ||----w |
                ||     ||
./target/release/wasmer cowsay.wasm -- hello world  55.54s user 0.02s system 100% cpu 55.557 total

Additional context

• wasmer can be compiled on FreeBSD/amd64 as of ~30 minutes ago: Improve FreeBSD support #3365

[Michael-F-Bryan]

Thanks for reporting this @MalloryA. It might be something to do with our WasiPipe implementation reading stdout/stdin in a busy loop or pipes not being closed properly.

We're happy to review pull requests if someone finds a solution, but we don't currently have bandwidth to actively support BSD.