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by int_19h 205 days ago
The worst bug in my career was when the app would reliably crash if you left it running for "long enough" - but still non-probabilistically, so sometimes it would happen in an hour, sometimes in three. The crash itself was quickly diagnosed as a corrupt vtable, but finding the piece of code that had a pointer bug in it that just happened to write into (some) object's vtable in certain situations that triggered a race condition took many days.