When starting zabbix_server (trunk, r4956) it dies stating
"zabbix_server in free(): error: chunk is already free"

In http://archives.neohapsis.com/archives/freebsd/2002-03/0248.html I found the string, it says:
"When attempting to double-free an area of memory, phkmalloc will
issue a warning:

progname in free(): error: chunk is already free

and may call abort(3) if the malloc flag 'A' is used."

I don't know how to trace down the place where mem is being freed twice but the only recent change I can find that has a "free" in it is r4949 trunk/src/zabbix_server/trapper/trapper.c

So maybe you guys know more.

Contact me if I can give any extra information