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[2015-01-07 18:32 UTC] yicheng at heroengine dot com
Description:
------------
Given this sample stored procedure:
DELIMITER //
drop procedure IF EXISTS `testProcedure`;
CREATE DEFINER=`root`@`%` PROCEDURE `testProcedure`(IN `v_username` VARCHAR(255))
MAIN:BEGIN
DECLARE done INT DEFAULT 0;
DECLARE p_username VARCHAR(255) DEFAULT 'default';
DECLARE sub CURSOR FOR SELECT 'Jon Jones' AS Acct_Username;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
OPEN sub;
read_loop: LOOP
FETCH sub INTO p_username;
IF done=1 THEN
LEAVE read_loop;
END IF;
END LOOP read_loop;
CLOSE sub;
SELECT 'Some kind of message' AS Msg, '200000' AS Num,CURDATE() AS current;
END;
//
Executing the above procedure from the mysql command line retrieves the following results:
MySQL [AMS]> CALL testProcedure('yicheng');//
+----------------------+--------+------------+
| Msg | Num | current |
+----------------------+--------+------------+
| Some kind of message | 200000 | 2015-01-07 |
+----------------------+--------+------------+
1 row in set (0.00 sec)
Calling the same procedure from mysqli (e.g. the test script) will result in a segmentation fault, as shown in the following line from apache error_log:
[Wed Jan 07 13:09:50.161212 2015] [core:notice] [pid 4653:tid 140193375778624] AH00052: child pid 22786 exit signal Segmentation fault (11)
Curiously, taking out the select statement from the procedure will remove the segfault but will still cause a php error due to attempting to call fetch_array on a non-object.
Also, if I insert another select statement before the call to OPEN sub, this will also avert the segfault although it will now cause two result sets to be returned.
Test script:
---------------
$mysqli = new mysqli("host", "user", "pass", "DBNAME");
$sql = "CALL testProcedure(?)";
$username = "yicheng";
$statement = $mysqli->prepare($sql);
$statement->bind_param("s", $username);
$statement->execute();
$result = $statement->get_result();
echo "Get Results<br/>\n";
while ($row = $result->fetch_array(MYSQLI_ASSOC)) {
echo var_export($row, TRUE)."<br/>\n";
}
i
echo "Closing Mysqli<br/>\n";
$mysqli->close();
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Last updated: Sat Oct 25 11:00:01 2025 UTC |
Thread 1 (Thread 0x7ffff79c3840 (LWP 24631)): #0 mysqlnd_fetch_stmt_row_cursor (result=0x7ffff79c0738, param=0x7ffff79c0c10, flags=1, fetched_anything=0x1 <error: Cannot access memory at address 0x1>, tsrm_ls=0x10174e0) at /home/yicheng/Downloads/php-5.5.9/ext/mysqlnd/mysqlnd_ps.c:995 ret = (unknown: 16872672) stmt = 0x7ffff79be4f0 buf = " \272\001\000\000\000\000" row_packet = 0x7ffff79c0738 #1 0x00000000007048aa in php_mysqlnd_res_fetch_into_pub (result=0x7ffff79c0738, flags=1, return_value=0x7ffff79c0c10, extension=MYSQLND_MYSQLI, tsrm_ls=0x10174e0) at /home/yicheng/Downloads/php-5.5.9/ext/mysqlnd/mysqlnd_result.c:1485 fetched_anything = 0 '\000' #2 0x00000000005d9dac in php_mysqli_fetch_into_hash_aux (tsrm_ls=0x10174e0, fetchtype=<optimized out>, result=<optimized out>, return_value=0x7ffff79c0c10) at /home/yicheng/Downloads/php-5.5.9/ext/mysqli/mysqli.c:1219 No locals. #3 php_mysqli_fetch_into_hash (ht=<optimized out>, return_value=0x7ffff79c0c10, return_value_ptr=<optimized out>, this_ptr=0x7ffff79c0438, return_value_used=<optimized out>, tsrm_ls=0x10174e0, override_flags=override_flags@entry=0, into_object=into_object@entry=0) at /home/yicheng/Downloads/php-5.5.9/ext/mysqli/mysqli.c:1272 result = <optimized out> mysql_result = 0x7ffff79c0438 fetchtype = 1 ctor_params = 0x0 ce = 0x0 #4 0x00000000005e3298 in zif_mysqli_fetch_array (ht=<optimized out>, return_value=<optimized out>, return_value_ptr=<optimized out>, this_ptr=<optimized out>, return_value_used=<optimized out>, tsrm_ls=<optimized out>) at /home/yicheng/Downloads/php-5.5.9/ext/mysqli/mysqli_nonapi.c:350 No locals. #5 0x00007ffff11e30dd in xdebug_execute_internal (current_execute_data=0x7ffff7984460, fci=0x0, return_value_used=1, tsrm_ls=0x10174e0) at /home/yicheng/Downloads/xdebug-2.2.5/xdebug.c:1553 edata = <optimized out> fse = 0x1314b10 cur_opcode = <optimized out> do_return = 0 function_nr = 6 restore_error_handler_situation = 0 tmp_error_cb = 0x0 #6 0x0000000000843e1e in zend_do_fcall_common_helper_SPEC (execute_data=<optimized out>, tsrm_ls=0x10174e0) at /home/yicheng/Downloads/php-5.5.9/Zend/zend_vm_execute.h:552 ret = 0x7ffff7984100 opline = <optimized out> should_change_scope = 1 '\001' fbc = 0x1212750 #7 0x00000000007b32eb in execute_ex (execute_data=0x7ffff7984460, tsrm_ls=0x10174e0) at /home/yicheng/Downloads/php-5.5.9/Zend/zend_vm_execute.h:363 ret = <optimized out> original_in_execution = 0 '\000' #8 0x00007ffff11e20fb in xdebug_execute_ex (execute_data=0x7ffff7984460, tsrm_ls=<optimized out>) at /home/yicheng/Downloads/xdebug-2.2.5/xdebug.c:1437 op_array = 0x7ffff79b9720 edata = <optimized out> dummy = 0x101a8c8 fse = 0x1312090 xfse = <optimized out> magic_cookie = 0x0 do_return = 0 function_nr = 0 le = <optimized out> clear = 1 return_val = 0x0 #9 0x00000000007883c3 in zend_execute_scripts (type=type@entry=8, tsrm_ls=tsrm_ls@entry=0x10174e0, retval=retval@entry=0x0, file_count=file_count@entry=3) at /home/yicheng/Downloads/php-5.5.9/Zend/zend.c:1316 files = {{gp_offset = 48, fp_offset = 0, overflow_arg_area = 0x7fffffffa8a0, reg_save_area = 0x7fffffffa830}} i = 1 file_handle = 0x7fffffffcbb0 orig_op_array = 0x0 orig_retval_ptr_ptr = 0x0 orig_interactive = 0 ---Type <return> to continue, or q <return> to quit--- #10 0x000000000071a6eb in php_execute_script (primary_file=primary_file@entry=0x7fffffffcbb0, tsrm_ls=tsrm_ls@entry=0x10174e0) at /home/yicheng/Downloads/php-5.5.9/main/main.c:2506 realfile = "/home/yicheng/p4_1666/yicheng-HEROENGINE-HEWKST03-Ubuntu/web/MAIN/AMS/public/test_mysqli_cli.php\000\210[ ;\000\000\000\024^y\000\000\000\000\000\001\000\000\000\000\000\000\000\200Nw\360\330uD\210\000\204[ ;\000\000\000\200\355\206\353\326O9\253\000\204[ ;\000\000\000\222\274& ;\000\000\000\340t\001\001\000\000\000\000\030N\204\000\000\000\000\000\340t\001\001\000\000\000\000\340t\001\001\000\000\000\000\bQ\001\001\000\000\000\000"... __orig_bailout = 0x7fffffffcc30 __bailout = {{__jmpbuf = {140737488342064, 1591329364349861654, 16872512, 19996368, 0, 16872512, 1591329367629807382, -1591328964377002218}, __mask_was_saved = 0, __saved_mask = {__val = {416611827788, 538985832, 0, 7600157958838642735, 253945935712, 77, 16872672, 19033704, 19996368, 140737488342272, 96, 19033704, 0, 16872512, 7426434, 19996368}}}} prepend_file_p = <optimized out> append_file_p = 0x0 prepend_file = {type = ZEND_HANDLE_FILENAME, filename = 0x0, opened_path = 0x0, handle = {fd = 0, fp = 0x0, stream = {handle = 0x0, isatty = 0, mmap = {len = 0, pos = 0, map = 0x0, buf = 0x0, old_handle = 0x0, old_closer = 0x0}, reader = 0x0, fsizer = 0x0, closer = 0x0}}, free_filename = 0 '\000'} append_file = {type = ZEND_HANDLE_FILENAME, filename = 0x0, opened_path = 0x0, handle = {fd = 0, fp = 0x0, stream = {handle = 0x0, isatty = 0, mmap = {len = 0, pos = 0, map = 0x0, buf = 0x0, old_handle = 0x0, old_closer = 0x0}, reader = 0x0, fsizer = 0x0, closer = 0x0}}, free_filename = 0 '\000'} old_cwd = 0x7fffffffa8b0 "" retval = 0 #11 0x000000000084620c in do_cli (argc=2, argv=0x1017400, tsrm_ls=0x10174e0) at /home/yicheng/Downloads/php-5.5.9/sapi/cli/php_cli.c:994 __orig_bailout = 0x7fffffffddd0 __bailout = {{__jmpbuf = {140737488346576, 1591329363715473174, 140737488346564, 0, 0, 16734912, 1591329364347764502, -1591328302247657706}, __mask_was_saved = 0, __saved_mask = {__val = {16872672, 16873888, 253942562044, 16872720, 16873936, 77, 7420677, 7420624, 32, 8, 7418462, 0, 8, 4311702208, 16863136, 8192}}}} c = <optimized out> file_handle = {type = ZEND_HANDLE_MAPPED, filename = 0x1017440 "./test_mysqli_cli.php", opened_path = 0x0, handle = {fd = -140797872, fp = 0x7ffff79b9850, stream = {handle = 0x7ffff79b9850, isatty = 0, mmap = {len = 950, pos = 0, map = 0x7ffff7ff6000, buf = 0x7ffff7ff6000 <error: Cannot access memory at address 0x7ffff7ff6000>, old_handle = 0x1311f40, old_closer = 0x79ead0 <zend_stream_stdio_closer>}, reader = 0x79eb00 <zend_stream_stdio_reader>, fsizer = 0x79ea70 <zend_stream_stdio_fsizer>, closer = 0x79ebe0 <zend_stream_mmap_closer>}}, free_filename = 0 '\000'} behavior = <optimized out> reflection_what = 0x0 request_started = 1 exit_status = 0 php_optarg = 0x0 php_optind = 2 exec_direct = 0x0 exec_run = 0x0 exec_begin = 0x0 exec_end = 0x0 arg_free = <optimized out> arg_excp = <optimized out> script_file = <optimized out> translated_path = <optimized out> interactive = 0 lineno = 1 param_error = <optimized out> hide_argv = 0 #12 0x00000000004335be in main (argc=2, argv=0x1017400) at /home/yicheng/Downloads/php-5.5.9/sapi/cli/php_cli.c:1378 __orig_bailout = 0x0 __bailout = {{__jmpbuf = {0, 1591329363715473174, 140737488346564, 0, 0, 16734912, 1591329363733298966, -1591328840252473578}, __mask_was_saved = 0, __saved_mask = {__val = {539461051, 253942530944, 16867344, 0, 253940077760, 140737488346736, 140737488346720, 4131212846, 4288704, 4294967295, 253937903414, 253942104512, 140737349878992, 254241942936, 253942085312, 1}}}} tsrm_ls = 0x10174e0 c = <optimized out> exit_status = 0 module_started = 1 sapi_started = 1 php_optarg = 0x0 php_optind = 1 use_extended_info = 0 ini_path_override = 0x0 ini_entries = 0x1019a60 "html_errors=0\nregister_argc_argv=1\nimplicit_flush=1\noutput_buffering=0\nmax_execution_time=0\nmax_input_time=-1\n" ini_entries_len = 0 ini_ignore = 0 sapi_module = <optimized out>