This is a high load site.
With enabled eAccelerator:
#0 zend_hash_rehash (ht=0x83965f0) at
/usr/local/src/build/php-5.2.3/Zend/zend_hash.c:447
447 nIndex = p->h & ht->nTableMask;
(gdb) bt
#0 zend_hash_rehash (ht=0x83965f0) at
/usr/local/src/build/php-5.2.3/Zend/zend_hash.c:447
#1 0x0823bca5 in zend_hash_do_resize (ht=0x83854d0) at
/usr/local/src/build/php-5.2.3/Zend/zend_hash.c:428
#2 0x0823c333 in _zend_hash_quick_add_or_update (ht=0x83854d0,
arKey=0x28e630ec "nid", nKeyLength=4, h=2090544320, pData=0xbfbfa7cc,
nDataSize=4,
pDest=0xbfbfa870, flag=1) at
/usr/local/src/build/php-5.2.3/Zend/zend_hash.c:334
#3 0x0824c5d1 in zend_assign_to_variable (result=0x28e588b8,
op1=0x28e588cc, op2=0x28e588e0, value=0x83ac9b4, type=4, Ts=0xbfbfa8e0)
at /usr/local/src/build/php-5.2.3/Zend/zend_execute.c:160
#4 0x082a3eca in ZEND_ASSIGN_SPEC_CV_VAR_HANDLER
(execute_data=0xbfbfaec0) at zend_vm_execute.h:24140
#5 0x0824d59d in execute (op_array=0x83a7398) at zend_vm_execute.h:92
#6 0x08253c17 in ZEND_INCLUDE_OR_EVAL_SPEC_CONST_HANDLER
(execute_data=0xbfbfb390) at zend_vm_execute.h:2030
#7 0x0824d59d in execute (op_array=0x839911c) at zend_vm_execute.h:92
#8 0x0823448d in zend_execute_scripts (type=8, retval=0x0, file_count=3)
at /usr/local/src/build/php-5.2.3/Zend/zend.c:1134
#9 0x081fca21 in php_execute_script (primary_file=0xbfbfeb90) at
/usr/local/src/build/php-5.2.3/main/main.c:1794
#10 0x082b078a in main (argc=1, argv=0xbfbfec20) at
/usr/local/src/build/php-5.2.3/sapi/cgi/cgi_main.c:1735
With disabled eAccelerator:
#0 0x0821ca31 in _zend_mm_free_int (heap=0x838a000, p=0x0) at
/usr/local/src/build/php-5.2.3/Zend/zend_alloc.c:821
821 if (UNEXPECTED(prev->next_free_block != mm_block)
|| UNEXPECTED(next->prev_free_block != mm_block)) {
(gdb) bt
#0 0x0821ca31 in _zend_mm_free_int (heap=0x838a000, p=0x0) at
/usr/local/src/build/php-5.2.3/Zend/zend_alloc.c:821
#1 0x081ef11d in mysqlnd_simple_command_handle_response (conn=0x84fc000,
ok_packet=3217001560, silent=0 '\0', command=COM_PING)
at /usr/local/src/build/php-5.2.3/ext/mysqlnd/mysqlnd.c:264
#2 0x081ef3f7 in mysqlnd_simple_command (conn=0x84fc000,
command=COM_PING, arg=0x0, arg_len=0, ok_packet=PROT_OK_PACKET, silent=0
'\0')
at /usr/local/src/build/php-5.2.3/ext/mysqlnd/mysqlnd.c:360
#3 0x081f01fa in php_mysqlnd_conn_ping_pub (conn=0x84fc000) at
/usr/local/src/build/php-5.2.3/ext/mysqlnd/mysqlnd.c:813
#4 0x080e0e00 in php_mysql_do_connect (ht=139434544,
return_value=0x83ac040, return_value_ptr=0x0, this_ptr=0x0,
return_value_used=1, persistent=1)
at /usr/local/src/build/php-5.2.3/ext/mysql/php_mysql.c:758
#5 0x0824de16 in zend_do_fcall_common_helper_SPEC
(execute_data=0xbfbf91e0) at zend_vm_execute.h:200
#6 0x0824d59d in execute (op_array=0x83ab520) at zend_vm_execute.h:92
#7 0x08253c17 in ZEND_INCLUDE_OR_EVAL_SPEC_CONST_HANDLER
(execute_data=0xbfbfb380) at zend_vm_execute.h:2030
#8 0x0824d59d in execute (op_array=0x83998b0) at zend_vm_execute.h:92
#9 0x0823448d in zend_execute_scripts (type=8, retval=0x0, file_count=3)
at /usr/local/src/build/php-5.2.3/Zend/zend.c:1134
#10 0x081fca21 in php_execute_script (primary_file=0xbfbfeb80) at
/usr/local/src/build/php-5.2.3/main/main.c:1794
#11 0x082b078a in main (argc=1, argv=0xbfbfec1c) at
/usr/local/src/build/php-5.2.3/sapi/cgi/cgi_main.c:1735
