Catch-22 (logic)
A catch-22 is a paradoxical situation in which an individual cannot or is incapable of avoiding a problem because of contradictory constraints or rules. Often these situations are such that solving one part of a problem only creates another problem, which ultimately leads back to the original problem. Catch-22s often result from rules, regulations, or procedures that an individual is subject to but has no control over.
The term catch-22 was coined by Joseph Heller in his novel Catch-22. Initially this is based on the explanation of the character Doc Daneeka as to why any pilot requesting a psych evaluation hoping to be found not sane enough to fly, and thereby escape dangerous missions, would thereby demonstrate his sanity:
"You mean there's a catch?"
"Sure there's a catch", Doc Daneeka replied. "Catch-22. Anyone who wants to get out of combat duty isn't really crazy."
Read more about Catch-22 (logic): Logic, Other Uses From The Novel, Significance of The Number 22, Situations With Logical Similarities To A Catch-22