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rr (debugging)
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<p>In computing, rr is a <a href="/facts/Debugging_tool/mCe6UsWj">debugging tool</a> for Linux designed to <a href="/facts/Record_and_replay_debugging/Hj5LvMLM">record and replay program execution</a>. During the replay phase, rr provides an enhanced <a href="/facts/Gdb/nTs958uC">gdb</a> debugging experience that supports reverse execution. </p><p>rr was originally developed by <a href="/facts/Mozilla/FevL9Itn">Mozilla</a> to debug <a href="/facts/Mozilla_Firefox/xez2zv8H">Mozilla Firefox</a> on commodity hardware and software. rr is now widely used outside Mozilla and capable of debugging software such as <a href="/facts/Google_Chrome/4INfWq37">Google Chrome</a>, <a href="/facts/QEMU/s6utqULJ">QEMU</a>, and <a href="/facts/LibreOffice/MInj5kF7">LibreOffice</a>. rr is <a href="/facts/Free_software/IaoVtJXn">free software</a>. </p>