[Samba] help me (log.nmbd is to big)

[Jimmy]

Hi everyone.
   I am used slackware version 12, and  kernel version 2.6.23.8.
My samba server verison 3.0.25b. =20
server running the log.nmbd file recoder the mesage  repeatedly like =
this.

2007/11/29 15:26:01, 0] nmbd/nmbd.c:main(697)
  Netbios nameserver version 3.0.27a started.
  Copyright Andrew Tridgell and the Samba Team 1992-2007
[2007/11/29 15:26:01, 0] =
/usr/src/samba-3.0.27a/source/lib/pidfile.c:pidfile_create(112)
  ERROR: nmbd is already running. File =
/usr/local/samba/var/locks/nmbd.pid exists and process id 5664 is =
running.


 the log.nmbdfile increase to 800MB in 8 hours.
how can i soluteion this problems? thanks.