Thanks Arran but Alan's just pointed out the issue. Thanks again for you're your time. Regards, Mohamed -----Original Message----- From: Mohamed Imran (NBI) Sent: 11 September 2015 13:41 To: 'freeradius-users@lists.freeradius.org' <freeradius-users@lists.freeradius.org> Subject: sql query in post-auth - segmentation fault Hi Arran, # gdb --args /usr/local/sbin/radiusd -X GNU gdb (GDB) Red Hat Enterprise Linux (7.2-83.el6) Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/local/sbin/radiusd...done. (gdb) bt No stack. (gdb) backtrace full No stack. Regards, Mohamed