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UndoDB allows gdb to step Linux applications backwards as well as
forwards. Horrible bugs such as race conditions and memory corruption that
previously took weeks to find can now be found in minutes. UndoDB wraps gdb
and adds a few simple commands which make a huge difference. The new
bstep command works just like gdb's step, only it steps the
program one line backwards. There are backwards equivalents of next,
stepi, nexti, finish and until.
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