[TUHS] Bugs in V6 'dcheck'

Noel Chiappa: To me, it's completely amazing to find such a serious bug in such a critical piece of widely-distributd code! A lesson for archaeologists... ====== To me it's not surprising at all. On one hand, current examples of widely-distributed critical code containing serious flaws are legion. What, after all, were the Heartbleed and OS X goto fail; bugs? What is every version of Internet Explorer? On the other hand, Ken and Dennis and the other guys behind the earliest UNIX code were smart guys and good programmers, but they were far from perfect; and back in those days we were all a lot sloppier. So surprising? No. Interesting? Certainly. All bugs are interesting. (To me, anyway. Back in the 1980s, when I was at Bell Labs, SP&E published a paper by Don Knuth discussing all the many bugs found in TeX, including some statistical analysis. I thought it fascinating and revealing and think reading it made me a better programmer. Rob Pike thought it was terribly boring and shouldn't have been published. Decidedly different viewpoints.) Norman Wilson Toronto ON