There was a never-shipped bug in Solaris back around.. I want to say 2006? I don't remember exactly when, but there was a bug where block writes in a socketpai

There was a never-shipped bug in Solaris back around.. I want to say 2006? I don't remember exactly when, but there was a bug where block writes in a socketpair pipe could get swapped. I ended up writing a program that wrote entire blocks where each block was a repeated block counter, that way I could look for swapped blocks, and then also use that for the bug report. The application that was bit hard by this bug was ssh. Writing [repeated, if needed] monotonically increasing counters like this is a really good testing technique.