samba cause "kernel panic" on my server !

hi,

I installed and configured on my GNU/linux Debian Woody the official Debian 
binary package of samba (2.2.3a-6). Its configuration is viewable here : 
http://www.ricospirit.net/phpsysinfo

This server is on a workgroup with Windows 2000 Pro workstations with SP2. 
My problem is when I copy big files on my "stockage" share (more than 500Mb 
per file) from the win2k workstation, smbd causes a kernel panic and my 
server I completely crashed :(

My smb.conf file is here : http://www.ricospirit.net/temp/smb.conf.txt
And my system log is here : http://www.ricospirit.net/temp/crash.txt

I have no idea about the cause, so I hope someone here will be able to give 
me some pointer...

Best regards,

-- 
Eric Belhomme