Log files from Comau indicate that samba stopped respoinding and winbind cored. 

I've uploaded all of the log files plus the core to our ftp site in the A3/core directory

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Oct 23 05:06:12 pwrfile001 winbindd[3014]: =============================================================== 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: [2007/10/23 05:06:12, 0] lib/fault.c:fault_report(42) 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: INTERNAL ERROR: Signal 11 in pid 3014 (3.0.25b-1.1.72-1411-SUSE-CODE10) 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: Please read the Trouble-Shooting section of the Samba3-HOWTO 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: [2007/10/23 05:06:12, 0] lib/fault.c:fault_report(44) 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: [2007/10/23 05:06:12, 0] lib/fault.c:fault_report(45) 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: =============================================================== 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: [2007/10/23 05:06:12, 0] lib/util.c:smb_panic(1632) 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: PANIC (pid 3014): internal error 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: [2007/10/23 05:06:12, 0] lib/util.c:log_stack_trace(1736) 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: BACKTRACE: 13 stack frames: 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #0 /usr/sbin/winbindd(log_stack_trace+0x1c) [0x55555562dbdc] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #1 /usr/sbin/winbindd(smb_panic+0x43) [0x55555562dcc3] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #2 /usr/sbin/winbindd [0x55555561bb02] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #3 /lib64/libc.so.6 [0x2b1df78c3b20] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #4 /usr/sbin/winbindd(_talloc_steal+0xf) [0x5555556141cf] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #5 /usr/sbin/winbindd [0x5555555cdc12] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #6 /usr/sbin/winbindd [0x5555555b6a95] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #7 /usr/sbin/winbindd [0x5555555af404] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #8 /usr/sbin/winbindd [0x5555555b06ec] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #9 /usr/sbin/winbindd [0x5555555b08e7] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #10 /usr/sbin/winbindd(main+0x83c) [0x5555555aaf0c] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #11 /lib64/libc.so.6(__libc_start_main+0xf4) [0x2b1df78b1154] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: #12 /usr/sbin/winbindd [0x5555555a95c9] 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: [2007/10/23 05:06:12, 0] lib/fault.c:dump_core(181) 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: dumping core in /var/log/samba/cores/winbindd 
Oct 23 05:06:12 pwrfile001 winbindd[3014]: 
Oct 23 05:16:03 pwrfile001 smbd[30209]: [2007/10/23 05:16:03, 0] rpc_server/srv_pipe.c:api_rpcTNP(2287) 
Oct 23 05:16:03 pwrfile001 smbd[30209]: api_rpcTNP: wkssvc: WKSSVC_NETWKSTAENUMUSERS failed.