The RD Debugger: What 55000 lines of Rust gets you - Release Radar
The Record & Debug Tool (rd) is a Rust language port of the rr-debugger/rr debugger.
With rd you can record Linux program executions. Subsequently you can replay these executions back exactly and debug them in the gdb front-end. If you know how to use rr then you already know how to use rd.
The port is substantially complete and is currently of an alpha level quality. You should be able to use rd for the tasks you would ordinarily use rr for.