To address issue 1490, I just checked in an rr improvement that changes the behavior of gdb+rr in a user-visible way. When the last thread of the debuggee process exits, rr generates a fake SIGKILL signal before exiting the process. This gives the user a chance to reverse-execute from the end of the debuggee execution, when previously rr would have let the process terminate normally so reverse execution cannot occur. The new behavior is a little bit of a lie since in most cases SIGKILL was never actually sent, but I hope the usefulness of this new behavior outweights any possible confusion.

http://robert.ocallahan.org/2015/06/small-change-to-rr-behavior.html