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a5f6e6189e
the strcat checker first checks dest for overlap, then src. If the padding byte between b[] and the pad[] arrays happens to be zero the dest check would have succeeded and the src test failed. If that padding byte would be zero the dest check would trigger first. As we can't influence the padding byte (only the b[] and pad[] arrays) it was random if the dest or src checks triggered. This makes it reliably trigger the dest check first.