MUSH has memory leak?

room description:
map_nanyang={
	[1]={
		roomid=1,
		roomname="æäµÀ",
		roomindex=1,
		roomnumber=1,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÄÏÑô¸®¾³ÄÚµÄÒ»ÌõæäµÀ¡£Â·ÉÏÈËÀ´ÈËÍù£¬³¾ÍÁ·ÉÑï¡£²»Ê±ÓÐÁ½ÈýÆï¿ìÂí·É³Û¶ø¹ý£¬ÑïÆðһ·³¾°£¡£ÂíÉϵÄÈ˸ö¸öÉíמ¢×°£¬Ò¼×ÏÊÃ÷£¬ÓеĻ¹ËæÉíÅå´ø×ŵ¶½£¡£¿´À´¶¼ÊÇЩϰÎäµÄ½­ºþÈË¡£µÀ·Á½ÅÔÊÇÕûÕûÆëÆëµÄÑîÊ÷ÁÖ¡£´ÓÕâÀïÏò±±Ò»Ö±×ß¾ÍÊÇÄÏÑô³ÇÁË¡£",
		roomcx=0,
		roomcy=0,
		roomcz=0,
		roomexists={
			["e"]=9,
			["n"]=2
		}
	},
	[2]={
		roomid=2,
		roomname="ÄÏÃÅ",
		roomindex=1,
		roomnumber=1,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÀïÊÇÄÏÑô¸®µÄÄϳÇÃÅ£¬ÒòΪÄÏÑôµØ´¦ÓÚÏåÑô±±È¥µÄÒª³å£¬ËùÒÔ·ÉÏÍùÀ´µÄÈ˺ܶࡣ¸Ï³µµÄÂí·ò¡¢ÉϾ©¸Ï¿¼µÄÊéÉú¡¢Ìôµ£µÄ½Å·ò¡¢ÍƳµµÄС··¡¢ÎõÎõÈÁÈÁ£¬ºÜÊÇÈÈÄÖ¡£²»Ê±ÓÐÁ½ÈýÆï¿ìÂí´ÓÉí±ß·É³Û¶ø¹ý£¬ÑïÆðһ·³¾°£¡£",
		roomcx=0,
		roomcy=-1,
		roomcz=0,
		roomexists={
			["s"]=1,
			["n"]=3
		}
	},
	[3]={
		roomid=3,
		roomname="ʯ°å·",
		roomindex=1,
		roomnumber=1,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÄÏÑô³ÇÖеÄÒ»Ìõʯ°å·£¬½ÖµÀ²»ÊÇºÜ¿í£¬Á½±ßÔÔ×ÅÐí¶à°×ÑîÊ÷¡£Â·ÉÏÍùÀ´µÄÐÐÈË£¬Óм¸¸ö´Ó×°ÊøÀ´¿´ËƺõÊÇÎäÁÖÖÐÈË¡£ËûÃÇÒ»¸ö¸öÐÐÉ«´Ò´Ò´ÓÄãÉí±ß¾­¹ý£¬Íù¶«±ßµÄ²íµÀ¶øÈ¥¡£»¹ÓÐЩ¸Ï×Å´ó³µµÄÂí·ò£¬Ðе½ÕâÀïºóÒ²·×·×¹ÕÉÏÁËÏò¶«µÄ²íµÀ£¬¶«±ßµÄ²íµÀͨÍùÐí¼Ò¼¯¡£",
		roomcx=0,
		roomcy=-2,
		roomcz=0,
		roomexists={
			["e"]=4,
			["s"]=2,
			["n"]=14
		}
	},
	[4]={
		roomid=4,
		roomname="С·",
		roomindex=1,
		roomnumber=2,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÒ»ÌõƧ¾²µÄС·£¬Á½ÅÔÊÇïÃܵĴÔÁÖ¡£Â·ÉÏÒÀÏ¡¿É¼û³µÂí×ß¹ýÁôϵĺۼ£¡£Å¼¶ûÓм¸¸öÐÐÈËÐÐÉ«´Ò´Ò´ÓÄãÉí±ß¾­¹ý£¬Íù¶«±ßµÄÐí¼Ò¼¯¶øÈ¥¡£Î÷Ãæ·½ÏòÊÇÄÏÑô³Ç¡£",
		roomcx=1,
		roomcy=-2,
		roomcz=0,
		roomexists={
			["e"]=5,
			["w"]=3
		}
	},
	[5]={
		roomid=5,
		roomname="Çàʯ·",
		roomindex=1,
		roomnumber=2,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÐí¼Ò¼¯ÉϵÄÒ»ÌõÇàʯ·£¬Â·ÃæÉÏÆÌ×ÅÒ»²ãϸËéµÄʯ×Ó£¬Â·ÉϵÄÐÐÈ˲»¶à¡£ÄÏÃæÊÇÐí¼Ò¼¯µÄÊм¯¡£¶«ÃæÓÐÒ»ÌõС·ͨÍù¾ÛÏÍׯ¡£",
		roomcx=2,
		roomcy=-2,
		roomcz=0,
		roomexists={
			["e"]=10,
			["s"]=6,
			["w"]=4
		}
	},
	[6]={
		roomid=6,
		roomname="Ðí¼Ò¼¯",
		roomindex=1,
		roomnumber=1,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÄÏÑô¸½½üµÄÐí¼Ò¼¯£¬Êм¯ÉϺÜÈÈÄÖ£¬¸½½üµÄÅ©Ãñ¾­³£µ½ÕâÀïÀ´½»Ò××Ô¼ºÐÁ¿àÀͶ¯µÄ³É¹û¡£¼¯ÊÐÅÔ±ßÓÐƬ¿ÕµØ£¬Í£×ż¸Á¾Âí³µ¡£¶«ÃæÓмҿÍÕ»£¬ÃÅ¿ÚÕý¶Ô×ÅÕâÀï¡£",
		roomcx=2,
		roomcy=-1,
		roomcz=0,
		roomexists={
			["e"]=7,
			["sw"]=9,
			["s"]=8,
			["n"]=5
		}
	},
	[7]={
		roomid=7,
		roomname="¿ÍÕ»",
		roomindex=1,
		roomnumber=1,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊǸ½½üÔ¶½üÎÅÃûµÄÔÃÀ´¿ÍÕ»£¬ÉúÒâ·Ç³£ÐË¡¡£ÍâµØÓοͶàÑ¡ÔñÔÚÕâÀïÂä½Å£¬Äã¿ÉÒÔÔÚÕâÀï´òÌýµ½¸÷µØµÄ·çÍÁÈËÇé¡£µêС¶þÀïÀïÍâÍâæµÃÍÅÍÅת£¬½Ó´ý×ÅÄÏÇ»±±µ÷µÄ¿ÍÈË¡£Ç½ÉϹÒ×ÅÒ»¸öÅÆ×Ó(paizi)¡£",
		roomcx=3,
		roomcy=-1,
		roomcz=0,
		roomexists={
			["w"]=6
		}
	},
	[8]={
		roomid=8,
		roomname="Çàʯ·",
		roomindex=2,
		roomnumber=2,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÐí¼Ò¼¯ÉϵÄÒ»ÌõÇàʯ·£¬Â·ÃæÉÏÆÌ×ÅÒ»²ãϸËéµÄʯ×Ó£¬Â·ÉϵÄÐÐÈ˲»¶à¡£±±ÃæÊÇÐí¼Ò¼¯µÄÊм¯¡£",
		roomcx=2,
		roomcy=0,
		roomcz=0,
		roomexists={
			["n"]=6
		}
	},
	[9]={
		roomid=9,
		roomname="²í·",
		roomindex=1,
		roomnumber=1,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÒ»ÌõƧ¾²µÄС·£¬Á½ÅÔÊÇïÃܵĴÔÁÖ¡£Â·ÉÏÒÀÏ¡¿É¼û³µÂí×ß¹ýÁôϵĺۼ£¡£´ÓÕâÀïÍù¶«±±·½ÏòÊÇÄÏÑô¸®Ðí¼Ò¼¯£¬Î÷±ß·½Ïò×ßÊÇͨÍùÏåÑôºÍÄÏÑôÖ®¼äµÄÒ»ÌõæäµÀ¡£",
		roomcx=1,
		roomcy=0,
		roomcz=0,
		roomexists={
			["ne"]=6,
			["w"]=1
		}
	},
	[10]={
		roomid=10,
		roomname="С·",
		roomindex=2,
		roomnumber=2,
		roomflag=0,
		roomnpc={},
		roomdes="ÕâÊÇÒ»ÌõƧ¾²µÄС·£¬Á½ÅÔÊÇïÃܵĴÔÁÖ¡£Â·ÉÏÒÀÏ¡¿É¼û³µÂí×ß¹ýÁôϵĺۼ£¡£´ÓÕâÀïÍù¶«±±·½ÏòÊǸ½½üÔ¶½üÎÅÃûµÄ¾ÛÏÍׯ£¬Î÷ÃæÊÇͨÍùÐí¼Ò¼¯µÄÇàʯ·¡£ÕâÀïƽ³£Ã»ÓÐʲôÈË¡£",
		roomcx=3,
		roomcy=-2,
		roomcz=0,
		roomexists={
			["ne"]=11,
			["w"]=5
		}
	},
	[11]={
		roomid=11,
		roomname="¾ÛÏÍׯ´óÃÅ",
		roomindex=1,
		roomnumber=1,
		roomflag=0,
		roomnpc={},
		roomdes="Äã×ßµ½Ò»×ù¸ßÕ¬´óÔºµÄÃÅ¿Ú£¬´óÃÅ¿ª×Å£¬ÃÅÇ°×óÓÒÓÐÁ½¸öʯʨ×Ó£¬ËÄÎ弶Çàʯ̨½×ÉÏÊÇÁ½Éȶ¤ÂúÍ­¶¤µÄ´óÃÅ¡£¿´µÃ³öÕâÀïÊÇÒ»´ó»§È˼ҵÄסËù¡£ÃÅ¿ÚÕýÖÐÑë¸ßÐü×ÅÒ»¿éºÚµ×½ð×ֵĴóØÒ£¬ØÒÉÏдÓÐÈý¸ö´ó×Ö£º¡¾¾ÛÏÍׯ¡¿¡£",
		roomcx=4,
		roomcy=-3,
		roomcz=0,
		roomexists={
			["sw"]=10,
			["n"]=12
		}
}

walk lua script:
--»ñÈ¡·¿¼äsid,didÖ®¼äµÄ·¾¶
function getroompath(city,sid,did)
	local bestroom,temproom
	openlist={}
	closedlist={}
	if sid==did then return "" end
	table.insert(openlist,createnode(sid,0,"",nil,nil))
	while table.getn(openlist)~=0 do
		table.sort(openlist,function(a,b) return a.g<b.g end)
		bestroom=openlist[1]
		if bestroom.key==0 then
			print(city.."·¿¼ä"..bestroom.prevnode.."Óгö¿ÚÖ¸Ïò0£¬Çë²éÖ¤")
			return ""
		end
		table.remove(openlist,1)
		if not checkclosedlist(bestroom.key) then closedlist[bestroom.key]=bestroom end
		if bestroom.key==did then return getpathfromlist(sid,did) end
		for k,v in pairs(sjmap[city][bestroom.key].roomexists) do
			if not checkopenlist(v) then
				if not checkclosedlist(v) then table.insert(openlist,createnode(v,bestroom.g+1,k,bestroom.key,nil)) end
			end
		end
	end
end

function checkopenlist(key)
	for k,v in pairs(openlist) do
		if key==v.key then return true end
	end
	return false
end

function checkclosedlist(key)
	if closedlist[key]~=nil then
		return true
	else
		return false
	end
end
function getpathfromlist(sid,did)
	local tmp
	local path=""

	tmp=closedlist[did]
	path=tmp.path
	while tmp.prevnode~=sid do
		tmp=closedlist[tmp.prevnode]
		path=tmp.path..";"..path
	end
	return path
end