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zFindings

yFailure rate on tests is 18-23%

x“Failure” = crashing or hanging

yFailure rate of utilities on commercial versions of UNIX (from Sun, IBM, SGI, DEC, and NeXT) is 15-43%

yLinux: 9%

yGNU: 6%

y>50% of X-window aps crashed on random input; >25% crashed on random but legal X-event streams