Safari (17.5 -> 18.0.1): "Out of bounds memory access" and "RangeError: Bad value"

[bes]

Hello! I have a wasm library bundled with a TypeScript SPA through Webpack, and errors are sent to Sentry.

I have a large sample size of users (20k+ daily) and a small percentage of them are hitting "Out of bounds memory access", but only on recent versions of Safari. About 100 Safari users are getting "Out of bounds memory access" and "RangeError: Bad value" originating somewhere in WebAssembly.

Once one of the errors hit one method, all of them start throwing these errors.

I know this is a bit vague, but I want to gauge the community's feeling for what this might be.

• Is this just a Safari thing, or is it something I am doing wrong?
• What are your best ideas for debugging / reproducing this? (I haven't been able to reproduce it yet)

Zero errors from non-WebKit browsers in Sentry over a period of 90 days.

[daxpedda]

See #3698, I hope a stacktrace can be a good start.
There are also tools for coredumping, though I'm unsure how up-to-date they are now.

[Liamolucko]

This sounds similar to #3474; we never managed to solve that though, so it isn't of much help.