Hi sbotkine,
As you noted, the warning message is logged by the packet sequencer (pktseq). However, the warning is logged because pktseq caught an exception that wasn't handled by the SequencedPacketListener listed in the warning message:
[2014-03-19 00:33:17.100] WARN of-io-34-thread-1 hp.of.ctl.pktseq DE0005I Broken code? {com.unil.dhcpsdn.impl.DhcpSdnManager,DIRECTOR,alt=30000,care=[DHCP]}.event() caused exception: java.lang.NullPointerException
I would suggest looking at why DhcpSdnManager is hitting a NullPointerException. If you look into the virgo log and find this message, you may see the full stack trace of the exception printed.
Shaun