Comment by alexfoo

> I learned C in about 1989/1990 and have used it a lot since then. I have worked on a fair amount of rotten commercial C code, sold at a high price, in which every millimeter of extra functionality was bought with sweat and blood. I once spent a month finding a memory corruption issue that happened every 2 weeks with a completely different stack trace which, in the end, required a 1-line fix.

That sums up one of my old roles where this kind of thing accounted for about 10% of my time over a 10 year period.

Heisenbug, mutating stack traces, weeks between occurrences, 1 line fix, do some other interesting work before the next weird thing comes along.

I think the longest running one I had (several years) was some weird interaction between pthread_cond_wait() and pthread_cond_broadcast(). Ugh.