expired lease problem

[project722]

We had an unusual problem last night where the server was not able to give
out any more leases from a specific pool. The server logs showed " no more
free leases". This is a RHEL 6.7 server running dhcp 4.1.1.

We have scripts that run which look for active leases. In the pool in
question we had over 200 available leases but the server was unable to
provide them to a client. I dug around in dhcpd.leases and found what I
think is the problem. I found a ton of leases in the "expired" state with
an end date of 11/6. Which, If I am correct, will never move into it next
binding state of free so it can be used because its a date in the past.

Here is an example of one:

lease 172.210.141.159 {
  starts 2 2017/11/07 11:40:37;
  ends 2 2017/11/07 12:10:37;
  tstp 2 2017/11/14 11:55:37;
  cltt 2 2017/11/07 11:40:37;
  binding state expired;
  next binding state free;

Am I correct here? If so, what causes this problem and how can I fix it? I
have restarted dhcpd, but that does not help. If I were to edit
/var/lib/dhcp/dhcpd.leases manually and remove these entries what are some
things I should take into consideration?
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