I had to debug a program that did just that once, long ago, and the fix was to not free on exit. The program's behavior had been that it took ~20m and then one

I had to debug a program that did just that once, long ago, and the fix was to not free on exit. The program's behavior had been that it took ~20m and then one day it ran for hours and we never found out how long it would have taken. Fortunately it was a Tcl program, and the fix was to remove `unset`s of large hash tables before exiting.