Comment 2 for bug 1162838

Addicional info.
Since last code executed before crash was "auth/auth_util.c:856" I set "log level = 0 auth:9" and got:

[2013/04/03 09:03:20.588559, 5] auth/auth.c:489(make_auth_context_subsystem)
  Making default auth method list for DC, security=user, encrypt passwords = yes
[2013/04/03 09:03:20.588606, 5] auth/auth.c:385(load_auth_module)
  load_auth_module: Attempting to find an auth method to match guest
[2013/04/03 09:03:20.588639, 5] auth/auth.c:410(load_auth_module)
  load_auth_module: auth method guest has a valid init
[2013/04/03 09:03:20.588665, 5] auth/auth.c:385(load_auth_module)
  load_auth_module: Attempting to find an auth method to match sam
[2013/04/03 09:03:20.588691, 5] auth/auth.c:410(load_auth_module)
  load_auth_module: auth method sam has a valid init
[2013/04/03 09:03:20.588716, 5] auth/auth.c:385(load_auth_module)
  load_auth_module: Attempting to find an auth method to match winbind:trustdomain
[2013/04/03 09:03:20.588742, 5] auth/auth.c:385(load_auth_module)
  load_auth_module: Attempting to find an auth method to match trustdomain
[2013/04/03 09:03:20.588768, 5] auth/auth.c:410(load_auth_module)
  load_auth_module: auth method trustdomain has a valid init
[2013/04/03 09:03:20.588793, 5] auth/auth.c:410(load_auth_module)
  load_auth_module: auth method winbind has a valid init
[2013/04/03 09:03:20.588819, 5] auth/user_info.c:59(make_user_info)
  attempting to make a user_info for ()
[2013/04/03 09:03:20.588846, 5] auth/user_info.c:70(make_user_info)
  making strings for 's user_info struct
[2013/04/03 09:03:20.588872, 5] auth/user_info.c:87(make_user_info)
  making blobs for 's user_info struct
[2013/04/03 09:03:20.588897, 3] auth/auth.c:219(check_ntlm_password)
  check_ntlm_password: Checking password for unmapped user []\[]@[] with the new password interface
[2013/04/03 09:03:20.588923, 3] auth/auth.c:222(check_ntlm_password)
  check_ntlm_password: mapped user is: []\[]@[]
[2013/04/03 09:03:20.588963, 0] lib/fault.c:47(fault_report)
  ===============================================================
[2013/04/03 09:03:20.588989, 0] lib/fault.c:48(fault_report)
  INTERNAL ERROR: Signal 11 in pid 21366 (3.6.3)