Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru> writes:
> But ps shows that status of process is <existing>
> [14:46:02]root(at)postgres:~ # ps -elk | grep 25691556
> * A - 25691556 - - - - - <exiting>
As far as I could find by googling, this means that the process is
not actually a zombie yet, so it's not the postmaster's fault.
Apparently it's possible in some versions of AIX for an exiting process to
get stuck while releasing its reference to a socket, though I couldn't
find much detail about that. I wonder how old your AIX is ...
regards, tom lane