Software bug
error, flaw, failure or fault in a computer program/system that produces an incorrect or unexpected result or causes it to behave in unintended ways
stack overflow
Known error
software regression
Scunthorpe problem
fatal system error
focus stealing
Unicode bug
race condition
deadlock
vulnerability
paper cut bug
resource leak
Linux kernel oops
security bug
Sorcerer's Apprentice Syndrome
Bush hid the facts
infinite loop
Bohr bug
Internet Explorer box model bug
Nuclear Gandhi