(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1233830992 (LWP 18933)]
0xb79958fd in zend_call_function () from /usr/lib/apache2/modules/libphp5.so
(gdb) bt
#0  0xb79958fd in zend_call_function () from /usr/lib/apache2/modules/libphp5.so
#1  0xb7997217 in call_user_function_ex () from /usr/lib/apache2/modules/libphp5.so
#2  0xb79aaf16 in zend_error_noreturn () from /usr/lib/apache2/modules/libphp5.so
#3  0xb79cfdc8 in zend_get_compiled_variable_value () from /usr/lib/apache2/modules/libphp5.so
#4  0xb79edca6 in execute () from /usr/lib/apache2/modules/libphp5.so
#5  0xb79d0749 in execute () from /usr/lib/apache2/modules/libphp5.so
#6  0xb79d95b0 in execute () from /usr/lib/apache2/modules/libphp5.so
#7  0xb79d0749 in execute () from /usr/lib/apache2/modules/libphp5.so
#8  0xb79abedf in zend_execute_scripts () from /usr/lib/apache2/modules/libphp5.so
#9  0xb795219b in php_execute_script () from /usr/lib/apache2/modules/libphp5.so
#10 0x0827c760 in ?? ()
#11 0x00000000 in ?? ()
(gdb) bt f
#0  0xb79958fd in zend_call_function () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#1  0xb7997217 in call_user_function_ex () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#2  0xb79aaf16 in zend_error_noreturn () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#3  0xb79cfdc8 in zend_get_compiled_variable_value () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#4  0xb79edca6 in execute () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#5  0xb79d0749 in execute () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#6  0xb79d95b0 in execute () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#7  0xb79d0749 in execute () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#8  0xb79abedf in zend_execute_scripts () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#9  0xb795219b in php_execute_script () from /usr/lib/apache2/modules/libphp5.so
No symbol table info available.
#10 0x0827c760 in ?? ()
No symbol table info available.
#11 0x00000000 in ?? ()
No symbol table info available.
(gdb)