Robert Haas <robertmh...@gmail.com> writes: > On Thu, Mar 1, 2018 at 2:03 AM, Craig Ringer <cr...@2ndquadrant.com> wrote: >> So I can't say it's definitely impossible. It seems astonishingly unlikely, >> but that's not always good enough.
> Race conditions tend to happen a lot more often than one might think. Just to back that up --- we've seen cases where people could repeatably hit race-condition windows that are just an instruction or two wide. The first one I came to in an idle archive search is https://www.postgresql.org/message-id/15543.1130714273%40sss.pgh.pa.us I vaguely recall others but don't feel like digging harder right now. regards, tom lane
