Suricata

This is Suricata version 2.0beta1 RELEASE and latest git

defrag:
  memcap: 32mb
  hash-size: 65536
  trackers: 65535000000000 # number of defragmented flows to follow
  max-frags: 65535 # number of fragments to keep (higher than trackers)
  prealloc: yes
  timeout: 60

If we set the number of trackers bigger than what Suricata can handle , we receive an ERR message but Suricata's loading/start does not stop.

 01:30:42 - <Info> - Found an MTU of 1500 for 'eth0'
 01:30:42 - <Error> - [ERRCODE: SC_ERR_NUMERIC_VALUE_ERANGE(61)] - Numeric value out of range (65535000000000 > 4294967295)
 01:30:42 - <Info> - allocated 3670016 bytes of memory for the defrag hash... 65536 buckets of size 56
 01:30:42 - <Info> - preallocated 1000 defrag trackers of size 144

Since impact is not clear from the ERR code/msg , it is probably better if Suri stops the initialization phase.
Unless it defaults to the max possible value, but then it would be better if that is described in the ERR message