I wrote:
> Once the postmaster has been up for a little bit this seems not to happen
> anymore, which means it could have been that way for awhile without
> anyone noticing. I'm not sure yet how long is "a little bit" --- seems
> to be more than a minute, which destroys my first theory that the first
> autovac launch was involved...
Ah, found it ... not timing sensitive, but uninitialized-memory
sensitive :-(
regards, tom lane