I believe this is a bug in the ISC dhcpd. However, I did solve it in my
case (Debian Wheezy isc-dhcp-server 4.2.2.dfsg.1-5+deb70u6).
netstat -pant|grep dhcp
revealed a lot of CLOSE_WAIT sockets to my DHCP server's failover
partner (Ubuntu Trusty isc-dhcp-server 4.2.4-7ubuntu12).
It turned out that the secondary Ubuntu machine had two copies of dhcpd
running (ps aux|grep dhcpd). Killing the rogue version, and restarting
the primary Debian version cleared up the issue.
But the dhcpd still treats CLOSE_WAIT sockets incorrectly....
Daniel
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