[$] The case of the supersized shebang

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