binding UDP port 0 with SO_REUSEADDR

Hey all,

I recently noticed that binding UDP port 0 with SO_REUSEADDR yields
unexpected results for me - the kernel occasionally gives out UDP
ports used by other processes, if they were bound with SO_REUSEADDR,
too.

I did some digging, it seems that
f24d43c07e208372aa3d3bff419afbf43ba87698 introduced this behaviour.
I'm not at all sure if this could/should be called a bug, but I need
to say, it was severly unexpected at my side, and that probably goes
for others, too.

Just bringing this to your attention, I have no suggestions on it whatsoever.

Best,

Tobi