The Hermit Hacker <scrappy@hub.org> writes:
> kill -ABRT does nothing:
Oh? Must be hung up in a kernel call then. That will probably mean
that you can't attach to the stuck process with gdb either (though
it'd be worth trying, since a backtrace would be mighty useful if
you could get it).
My next thought is to truss the postmaster process before it hangs
up, with hopes of finding out what kernel call is hanging.
Also, you might try netstat to see if you can see any freshly-opened
incoming connections when it happens. Also, "lsof -p" or local
equivalent on the stuck postmaster.
regards, tom lane