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How many of those are false positives though? Probably just over 5000?

You get bug bounties if you report the kind of bugs Mythos identified. There's a reason no-one collected bounties from the "5000 defects" Coverity identified.

The Mythos reports have several examples of chaining a whole bunch of logic in different parts of the program together to exploit something very subtle. The Coverity reports aren't anything like that. These tools aren't remotely in the same league or even universe.

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Yeah, fuzzing, sanitizers, and bug bounties were our main pre-AI tools for finding bugs.
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it's just sad that Coverity represents the best working C++ static analysis tool.
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The best general purpose one, anyway. Specialty tools can be much better for their niches. Heck, compiler warnings are one such niche tool, and some of them are quite good.
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Firefox developers do fix issues found by Coverity. I haven't looked at the results in over a decade, but the last time I did there were a few code patterns we used in a lot of places which Coverity didn't like (but were actually okay the way we were doing them) which resulted in a colossal number of false positives.
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