Server disappears from network

[Scott Johnson]

> IIRC, there was a memory leak in the em driver for 8.0.  That and a 
bunch of other improvments
> to the em driver have happened since then so 
you may want to give 8-STABLE a go.

After some googling, I think I've found the problem: bug kern/144330, recently fixed in 8-stable.

I think it's unfortunate that such a bug (mbuf leakage) would manifest itself in this way. It is bad behavior for a server to simply disappear from the network with no other indication of what went wrong. Shouldn't there be something in /var/log/messages when the system runs out of mbufs?