(gdb) bt
#0 0x002ed402 in __kernel_vsyscall ()
#1 0x00681a1e in __lll_mutex_lock_wait () from /lib/libpthread.so.0
#2 0x0067d870 in _L_mutex_lock_85 () from /lib/libpthread.so.0
#3 0x0067d3bd in pthread_mutex_lock () from /lib/libpthread.so.0
#4 0x00b16b22 in _nss_files_gethostbyname_r () from /lib/libnss_files.so.2
#5 0x005e9b57 in gethostbyname_r@@GLIBC_2.1.2 () from /lib/libc.so.6
#6 0x004275e0 in my_gethostbyname_r () from /usr/local/mysql/lib/mysql/libmysqlclient.so.14
#7 0x0043524c in mysql_real_connect () from /usr/local/mysql/lib/mysql/libmysqlclient.so.14
#8 0x00847478 in pdo_mysql_handle_factory (dbh=0xa048034, driver_options=0xa273eb8)
at /tmp/php5.3.3_update/php-5.3.3/ext/pdo_mysql/mysql_driver.c:736
#9 0x00fb0266 in zim_PDO_dbh_constructor (ht=4, return_value=0xa272010, return_value_ptr=0x0, this_ptr=0xa273e5c,
return_value_used=0) at /data0/software/php-5.3.3/ext/pdo/pdo_dbh.c:378
#10 0x01168d59 in zend_do_fcall_common_helper_SPEC (execute_data=0xa168ef8) at /data0/software/php-5.3.3/Zend/zend_vm_execute.h:316
#11 0x01142ce8 in execute (op_array=0xa2707e8) at /data0/software/php-5.3.3/Zend/zend_vm_execute.h:107
#12 0x011211d7 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /data0/software/php-5.3.3/Zend/zend.c:1194
#13 0x010d0a5e in php_execute_script (primary_file=0xbfdabf20) at /data0/software/php-5.3.3/main/main.c:2261
#14 0x011a07ab in php_handler (r=0xa15a860) at /data0/software/php-5.3.3/sapi/apache2handler/sapi_apache2.c:669
#15 0x08077009 in ap_run_handler (r=0xa15a860) at config.c:157
#16 0x0807a18e in ap_invoke_handler (r=0xa15a860) at config.c:376
#17 0x08085168 in ap_process_request (r=0xa15a860) at http_request.c:282
#18 0x0808235b in ap_process_http_connection (c=0xa103128) at http_core.c:190
#19 0x0807e149 in ap_run_process_connection (c=0xa103128) at connection.c:43
#20 0x0808974d in child_main (child_num_arg=<value optimized out>) at prefork.c:662
#21 0x08089a27 in make_child (s=0x9e54fa0, slot=770) at prefork.c:758
#22 0x0808a380 in ap_mpm_run (_pconf=0x9e530a8, plog=0x9e81160, s=0x9e54fa0) at prefork.c:893
#23 0x080648b5 in main (argc=166006944, argv=0xa100f48) at main.c:740
(gdb)