100% agreed re. bringing concurrency issues to the surface. Another nasty one I encountered a couple years ago: After switching the build servers to using ramd

100% agreed re. bringing concurrency issues to the surface. Another nasty one I encountered a couple years ago: After switching the build servers to using ramdisks, the app started breaking in subtle ways. Turns out there were two conflicting dependencies, but building on a server using ext4 and with the specific number of concurrent threads caused the "right" one to appear first the .jar's central directory. Gotta add filesystem directory entry ordering to the list too.