Wasmer 2 Module::deserialize error: corrupted binary: misaligned metadata

[outkine]

Hello, I am using Wasmer and have some code that calls wasmer::Module::deserialize on bytes that I obtain in the following way:

let artifact = wasmer::UniversalArtifact::new(engine, &wasm_source, tunables).unwrap();
let bytes = artifact.serialize().unwrap();

I recently upgraded from Wasmer 1 to 2, and after updating the API calls deserialize started to panic with corrupted binary: misaligned metadata.

Something strange that I noticed is that a well-crafted println!() invocation before and after deserialize makes the problem go away. However, if this works for printing strings X and Y, it does not work when there is even the slightest change to X or Y.

Does anyone have any clues as to why this may happen? Thank you! As a quick note, someone seems to be having a similar problem in this issue, but unfortunately the suggested fix of upgrading to Wasmer 3 is not an option for me.

[xdoardo]

Wasmer 2, 3, and 4 are not maintained anymore: is there any way we can help make the latest version an option for you to use?