DHCPDv6 crashes when it encounters a duplicate host

[Christopher D Haakinson]

I have a DHCP server running with IPv6 only. It runs good for about 2 hours
(on a fairly busy, internal network), then suddenly it crashes. Every time
the crash occurs, the error log always shows that there was a lease already
in use(exact error message below), but I don't know how that's happening.

I am running ISC DHCP Version 4.2.0 with this command:   dhcpd -d -6 -f
eth0

Here is the error output and my dhcpd.conf:


-------------------------  Error:
Solicit message from fe80::221:5eff:fe88:19c port 546, transaction ID
0x84B4F00
Sending Advertise to fe80::221:5eff:fe88:19c port 546
Request message from fe80::221:5eff:fe88:19c port 546, transaction ID
0xF8022B00
Sending Reply to fe80::221:5eff:fe88:19c port 546
Decline message from fe80::221:5eff:fe88:19c port 546, transaction ID
0xA7C18B00
Client 00:01:00:01:4c:61:80:b3:2a:c6:73:00:00:00 reports address
fd80:1010::f453 is already in use by another host!
Sending Reply to fe80::221:5eff:fe88:19c port 546
Request message from fe80::221:5eff:fe88:19c port 546, transaction ID
0x8F931600
../../../lib/isc/heap.c:210: REQUIRE(index >= 1 && index <= heap->last)
failed, back trace
#0 0x51d108 in ??
#1 0x51d2aa in ??
#2 0x52f576 in ??
#3 0x43c00f in ??
#4 0x435018 in ??
#5 0x435e30 in ??
#6 0x438cfd in ??
#7 0x439966 in ??
#8 0x4530d8 in ??
#9 0x4444f2 in ??
#10 0x46d422 in ??
#11 0x53a3f1 in ??
#12 0x53fd61 in ??
#13 0x53031f in ??
#14 0x530550 in ??
#15 0x4464a0 in ??
#16 0x404d1e in ??
#17 0x31cac1d974 in ??
#18 0x403079 in ??
Aborted


-------------------  dhcpd.conf
dynamic-bootp-lease-length 600;
use-host-decl-names on;
allow client-updates;
ddns-updates on;
ddns-update-style interim;
ddns-domainname "serv6.com";
filename "pxelinux.0";
option dhcp-lease-time 3600;
option domain-name "serv6.com";
option dhcp6.domain-search "serv6.com";
option dhcp6.name-servers fd80:1010::2;
default-lease-time 3600;
max-lease-time 3900;
log-facility local7;

key "rndc-key" {
	algorithm hmac-md5;
	secret "123456789";
};

zone 0.0.0.0.0.0.0.0.0.1.0.1.0.8.d.f.ip6.arpa. {
	primary 127.0.0.1;
	key rndc-key;
}

zone serv6.com. {
	primary 127.0.0.1;
	key rndc-key;
}


subnet6 fd80:1010::/64 {
	range6 fd80:1010::dddd fd80:1010::ffff;
	one-lease-per-client true;
	update-static-leases on;
}
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