Kernel spits out
May 23 00:00:32 katiska /kernel: mb_map full
And network interface starts dropping packets. Occasionally a packet
or two gets through, as sometimes nfs says is alive again, and even a
login gets though. A couple of hours later the connections die
Don't know, but I assume it is a too small fixed-size table
somewhere, and probably a leak somewhere else.
Don't know, but suspect high load.
Stale bug; configuration error.