tweakcc 4.0.11 crashes on RHEL 8

[KJ7LNW]

Actually this is Oracle Linux 8, but it's basically the same thing. I have no idea what this means below, but hopefully it is useful to figure out the issue:

full report here (It wouldn't fit on the GitHub issue): https://privatebin.net/?6469c93f53679275#HdRtesJeoWveK3EHDMCiox7pcm4ccaybF7BMEPwKELNT - Expiration set to one week.

~]$ cat /etc/redhat-release 
Red Hat Enterprise Linux release 8.8 (Ootpa)

~]$ node --version
v24.11.1


~]$ npx tweakcc
/home/ewheeler/.npm/_npx/f44a4ca36ad91b43/node_modules/wasmagic/dist/libmagic-wrapper.js:8

...[huge long mess of trace removed ]...                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

RuntimeError: Aborted(CompileError: WebAssembly.instantiate(): Compiling function #30 failed: Wasm SIMD unsupported @+2001). Build with -sASSERTIONS for more info.
    at abort (/home/ewheeler/.npm/_npx/f44a4ca36ad91b43/node_modules/wasmagic/dist/libmagic-wrapper.js:8:4921)
    at instantiateArrayBuffer (/home/ewheeler/.npm/_npx/f44a4ca36ad91b43/node_modules/wasmagic/dist/libmagic-wrapper.js:8:5693)
    at async createWasm (/home/ewheeler/.npm/_npx/f44a4ca36ad91b43/node_modules/wasmagic/dist/libmagic-wrapper.js:8:6869)
    at async /home/ewheeler/.npm/_npx/f44a4ca36ad91b43/node_modules/wasmagic/dist/libmagic-wrapper.js:8:78295

Node.js v24.11.1

[signadou]

Hey @KJ7LNW! I've made a PR to fix this: #601. Are you able to test if it works? Here are the steps:

1. Clone tweakcc: git clone https://github.com/Piebald-AI/tweakcc
2. Switch to the branch: git checkout handle-wasmagic-import-errors-031026
3. Build the app: pnpm install && pnpm build
4. Test it out: pnpm start

[KJ7LNW]

At the moment the system that I have for testing is production host. I can run NPX and apply, but I can't really build the system. I don't have all that tooling installed.

[signadou]

@KJ7LNW That's no problem! npx supports running from a locally-built version of the package, which I've attached below:

npx ./tweakcc-4.0.11.tar.gz

tweakcc-4.0.11.tar.gz

[KJ7LNW]

No change, this is what I get:

]$ npx tweakcc-4.0.11.tar.gz 
Need to install the following packages:
file:tweakcc-4.0.11.tar.gz
Ok to proceed? (y) y

/home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8
var Module=moduleArg;var readyPromiseResolve,readyPromiseReject;var readyPromise=ne...
...

RuntimeError: Aborted(CompileError: WebAssembly.instantiate(): Compiling function #30 failed: Wasm SIMD unsupported @+2001). Build with -sASSERTIONS for more info.
    at abort (/home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:4921)
    at instantiateArrayBuffer (/home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:5693)
    at async createWasm (/home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:6869)
    at async /home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:78295

Node.js v24.11.1

[KJ7LNW]

I also tried downgrading to nodejs 22 and still get this error:

RuntimeError: Aborted(CompileError: WebAssembly.instantiate(): Compiling function #30 failed: Wasm SIMD unsupported @+2001). Build with -sASSERTIONS for more info.
    at abort (/home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:4921)
    at instantiateArrayBuffer (/home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:5693)
    at async createWasm (/home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:6869)
    at async /home/ewheeler/.npm/_npx/3af272bfeae07947/node_modules/wasmagic/dist/libmagic-wrapper.js:8:78295

Node.js v22.22.0

[JiwaniZakir]

The crash is caused by wasmagic (a dependency of tweakcc) shipping a WebAssembly binary compiled with SIMD instructions enabled, and the CPU or kernel on RHEL 8 doesn't support WebAssembly SIMD. Even though Node.js 24 has WASM SIMD support in V8, RHEL 8 ships with a kernel (4.18.x) that may not expose the required CPU SIMD feature flags to the WASM runtime. The failure point is in wasmagic/dist/libmagic-wrapper.js where it calls WebAssembly.instantiate() on a SIMD-enabled .wasm blob — if wasmagic offered a fallback non-SIMD build or a pure-JS alternative, this would resolve it on older kernels. The underlying fix would need to happen either in wasmagic (ship a non-SIMD fallback) or in tweakcc by replacing or conditionally avoiding wasmagic on platforms that don't support WASM SIMD.

[KJ7LNW]

The crash is caused by wasmagic

Interesting, were you able to reproduce the problem on a virtual machine?