9.4 HEAD: select() failed in postmaster

I've been getting some failures after an immediate shutdown or crash, during severe IO stress, with the message:

LOCATION:  ServerLoop, postmaster.c:1560

It is trying to sleep for -1 seconds.

I think the problem is here, where there should be a Max rather than a Min:

...

+           /* remaining time, but at least 1 second */

+           timeout->tv_sec = Min(SIGKILL_CHILDREN_AFTER_SECS -

+                                 (time(NULL) - AbortStartTime), 1);

But I don't understand the logic behind this anyway.  Why sleep at least 1 second?  If time is up, it is up, why not use zero as the minimum?

Cheers,

Jeff