Or in some cases might crash 8.5 million computers worldwide.
Yes the Crowdstrike crash was caused by going 1 past an array length, caused by a magic number index and a regex mistake, and wasn't caught because the tests didn't work.
The whole thing was a compound series of amateur mistakes, but with kernel access at boot time.
It's accessible for new users, easy for old users, but ironically the hardest if you know only just enough to be dangerous.
Sincerely, Someone who broke their desktop gui by tinkering, twice.