one-line fix: n. Used (often sarcastically) of a change to a program that is thought to be trivial or insignificant right up to the moment it crashes the system.

:one-line fix: n. Used (often sarcastically) of a change to a
program that is thought to be trivial or insignificant right up to
the moment it crashes the system. Usually `cured' by another
one-line fix. See also {I didn't change anything!}
-- The AI Hackers Dictionary

Related:

• one-line fix n. Used (often sarcastically) of a change to a program that is thought to be trivial or insignificant right up to the moment it crashes the system.
  Usually `cured' by another one-line fix. See also...
• I didn't change anything!: interj. An aggrieved cry often heard as bugs manifest during a regression test.
  The {canonical} reply to this assertion is "Then...
• I didn't change anything! interj. An aggrieved cry often heard as bugs manifest during a regression test.
  The canonical reply to this assertion is "Then it...
• twiddle: n. 1. Tilde (ASCII 1111110, `~'). Also called `squiggle',
  `sqiggle' (sic --- pronounced /skig'l/), and `twaddle'...
• wedged: adj. 1. To be stuck, incapable of proceeding without help.
  This is different from having crashed. If the system...
• glitch: /glich/ [from German `glitschen' to slip, via Yiddish `glitshen',
  to slide or skid] 1. n. A sudden interruption in ...
• glork: /glork/ 1. interj. Term of mild surprise, usually tinged with outrage,
  as when one attempts to save the results of two hours...
• line starve: [MIT] 1. vi. To feed paper through a printer the wrong way by one line (most printers can't do this).
  On a display terminal, to move the cursor up to...
• buried treasure: n. A surprising piece of code found in some program.
  While usually not wrong, it tends to vary from {crufty}...