[2013/03/14 09:55:55.913604,  0] lib/fault.c:46(fault_report)
  ===============================================================
[2013/03/14 09:55:55.913822,  0] lib/fault.c:47(fault_report)
  INTERNAL ERROR: Signal 11 in pid 18018 (3.5.2)
  Please read the Trouble-Shooting section of the Samba3-HOWTO
[2013/03/14 09:55:55.913855,  0] lib/fault.c:49(fault_report)

  From: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf
[2013/03/14 09:55:55.913876,  0] lib/fault.c:50(fault_report)
  ===============================================================
[2013/03/14 09:55:55.913893,  0] lib/util.c:1465(smb_panic)
  PANIC (pid 18018): internal error
[2013/03/14 09:55:55.926346,  0] lib/util.c:1569(log_stack_trace)
  BACKTRACE: 21 stack frames:
   #0 /usr/sbin/smbd(log_stack_trace+0x2d) [0xb723931d]
   #1 /usr/sbin/smbd(smb_panic+0x2d) [0xb723943d]
   #2 /usr/sbin/smbd(+0x3520ee) [0xb72270ee]
   #3 [0xffffe400]
   #4 /usr/sbin/smbd(name_to_8_3+0x80) [0xb7015660]
   #5 /usr/sbin/smbd(smbd_dirptr_lanman2_entry+0x1891) [0xb6fc6431]
   #6 /usr/sbin/smbd(+0xf1dd6) [0xb6fc6dd6]
   #7 /usr/sbin/smbd(+0xf6c8a) [0xb6fcbc8a]
   #8 /usr/sbin/smbd(reply_trans2+0x6a6) [0xb6fcebf6]
   #9 /usr/sbin/smbd(+0x1227a6) [0xb6ff77a6]
   #10 /usr/sbin/smbd(+0x122b82) [0xb6ff7b82]
   #11 /usr/sbin/smbd(+0x12313c) [0xb6ff813c]
   #12 /usr/sbin/smbd(run_events+0x1b6) [0xb724a2b6]
   #13 /usr/sbin/smbd(smbd_process+0x9af) [0xb6ff6cff]
   #14 /usr/sbin/smbd(+0x6a498c) [0xb757998c]
   #15 /usr/sbin/smbd(run_events+0x1b6) [0xb724a2b6]
   #16 /usr/sbin/smbd(+0x37558f) [0xb724a58f]
   #17 /usr/sbin/smbd(_tevent_loop_once+0x98) [0xb724abd8]
   #18 /usr/sbin/smbd(main+0xd6a) [0xb757a95a]
   #19 /lib/libc.so.6(__libc_start_main+0xe6) [0xb6c15b86]
   #20 /usr/sbin/smbd(+0x99181) [0xb6f6e181]
[2013/03/14 09:55:55.965729,  0] lib/fault.c:326(dump_core)
  dumping core in /var/log/samba/cores/smbd