(gdb) down
#5  0x0810158a in php_module_shutdown ()
(gdb) down
#4  0x0814031b in zend_shutdown ()
(gdb) down
#3  0x081497b5 in zend_hash_graceful_reverse_destroy ()
(gdb) down
#2  0x08149594 in zend_hash_apply_deleter ()
(gdb) down
#1  0x282392c9 in dlclose () from /libexec/ld-elf.so.1
(gdb) down
#0  0x28235ce0 in r_debug_state () from /libexec/ld-elf.so.1