misaligned pointer dereference

[stephanemagnenat]

Using Rust 1.71 on a Wasm target, I am getting the following error in debug mode:

book_web_advanced.js:470 panicked at 'misaligned pointer dereference: address must be a multiple of 0x10 but is 0x3cabc8',
.cargo/registry/src/index.crates.io-6f17d22bba15001f/simd-adler32-0.3.5/src/imp/wasm.rs:103

I am using simd-adler32 indirectly through several dependencies of the image crate (for example png), and I am compiling the wasm with the following flag: RUSTFLAGS="-C target-feature=+simd128" .

My understanding is that we are hitting the recently-merged (1.70) safety check: rust-lang/rust#98112

[CryZe]

Seems like this is a bug that I introduced. Interestingly in my other PR for NEON SIMD, I was aware of the unaligned load, weird that I missed it on WASM. I'll do a PR.

[mcountryman]

@stephanemagnenat this fix is in [email protected]. You'll have to temporarily target that version. I believe the cargo.patch config might get what you need until the entire dependency chain gets updated.

[CryZe]

You just need cargo update in the normal case.

[mcountryman]

Right, it's a minor version change.

[stephanemagnenat]

Thank you very much for the fast reaction!