Have two Samba machines used as dfs servers under a windows 2003 dfs domain root.     
All links on Samba machines point to windows servers.  I recently upgraded samba from 3.023 to 3.0.25b-1.el5_1.4.  Since then, we have had numerous connection problems and the logs have the following errors.

[2007/12/20 15:01:16, 0] lib/util.c:smb_panic(1654)
  PANIC (pid 1297): internal error
[2007/12/20 15:01:16, 0] lib/util.c:log_stack_trace(1758)
  BACKTRACE: 22 stack frames:
   #0 smbd(log_stack_trace+0x2d) [0x761b9d]
   #1 smbd(smb_panic+0x5d) [0x761ccd]
   #2 smbd [0x74c6ba]
   #3 [0x23b420]
   #4 /lib/libc.so.6(strnlen+0x48) [0x306418]
   #5 smbd(safe_strcpy_fn+0x42) [0x759e92]
   #6 smbd [0x659ef1]
   #7 smbd(_dfs_GetInfo+0x288) [0x65a348]
   #8 smbd [0x658b34]
   #9 smbd(api_rpcTNP+0x1dd) [0x6a342d]
   #10 smbd(api_pipe_request+0x19e) [0x6a3aae]
   #11 smbd [0x69ec93]
   #12 smbd [0x69f1dc]
   #13 smbd(write_to_pipe+0x71) [0x69d9b1]
   #14 smbd [0x58620a]
   #15 smbd [0x586716]
   #16 smbd(reply_trans+0x6cf) [0x58753f]
   #17 smbd [0x5e3600]
   #18 smbd(smbd_process+0x836) [0x5e4696]
   #19 smbd(main+0xbdd) [0x83e97d]
   #20 /lib/libc.so.6(__libc_start_main+0xdc) [0x2afdec]
   #21 smbd [0x5681d1]
[2007/12/20 15:01:16, 0] lib/fault.c:dump_core(181)
  dumping core in /var/log/samba/cores/smbd