There's tracing-mutex that builds a dag of your locks when you acquire them and panics (at runtime) if it could deadlock: https://github.com/bertptrs/tracing-mutex

parking_lot has a deadlock detection feature for when you deadlock that iirc tells you what deadlocked (so you're not trying to figure it out with a debugger and a lot of time) https://amanieu.github.io/parking_lot/parking_lot/deadlock/i...

I also just found out about https://github.com/BurtonQin/lockbud which seems to detect deadlocks and a few other issues statically? (seems to require compiling your crate with the same version of rust as lockbud uses, which from the docs is an old 1.63 nightly build?)