get_remote_hostname() calls check_ip_options(..., ntop) but, at that point, ntop is an uninitialised auto. check_ip_options(, ipaddr) then calls logit("...%.100s..", ipaddr) which will log some binary garbage.
Created attachment 966 [details] relocate check_ip_options call. The obvious fix would seem to be a relocation of the check_ip_options call.
Patch applied, thanks for the report.
Change all RESOLVED bug to CLOSED with the exception of the ones fixed post-4.4.