[$] The case of the supersized shebang

Regressions are an unavoidable side effect of software development; the
kernel is no different in that regard. The 5.0 kernel introduced a change
in the handling of the '#!' (or 'shebang') lines used to indicate
which interpreter should handle an executable text file. The problem has
been duly fixed, but the incident shows how easy it can be to introduce
unexpected problems and highlights some areas where the kernel's
development process does not work as well as we might like.