Instant replay: Debugging C and C++ programs with rr (Red Hat Developer)

The Red Hat Developer Blog has posted an
introduction to the rr debugger. 'rr records trace information
about the execution of an application. This information allows you to
repeatedly replay a particular recording of a failure and examine it in the
GNU Debugger (GDB) to better investigate the cause. In addition to
replaying the trace, rr lets you run the program in reverse, in essence
allowing you 'rewind the tape' to see what happened earlier in the
execution of the program.'