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[2008-11-17 18:13 UTC] james dot jones at firstinvestors dot com
Description:
------------
When running the code (in "Reproduce code" section below), I get a segmentation fault during cleanup (after the final echo).
Reproduce code:
---------------
<?php
echo "Connecting...\n";
$db = db2_connect('BOSS', 'bossweb', 'Htw2PsU2');
print_r($db);
echo "\nClosing...\n";
if(FALSE===db2_close($db)) {
echo "Error while closing...";
}
echo "Closed.\n";
?>
Expected result:
----------------
Connecting...
Resource id #4
Closing...
Closed.
Actual result:
--------------
Connecting...
Resource id #4
Closing...
Closed.
Segmentation fault
PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Thu Jul 03 12:01:33 2025 UTC |
Hi, Can you try following patch (v1.8.2 of IBM_DB2) on ibm_db2.c file and check for SegV. 350,355d349 < /* Disconnect from DB. If stmt is allocated, it is freed automatically*/ < if ( handle->handle_active ) { < rc = SQLDisconnect((SQLHDBC)handle->hdbc); < rc = SQLFreeHandle(SQL_HANDLE_DBC, handle->hdbc); < rc = SQLFreeHandle(SQL_HANDLE_ENV, handle->henv); < } 356a351,356 > /* Disconnect from DB. If stmt is allocated, it is freed automatically*/ > if ( handle->handle_active ) { > rc = SQLDisconnect((SQLHDBC)handle->hdbc); > rc = SQLFreeHandle(SQL_HANDLE_DBC, handle->hdbc); > rc = SQLFreeHandle(SQL_HANDLE_ENV, handle->henv); > } 604,605d603 < le_conn_struct = zend_register_list_destructors_ex( _php_db2_free_conn_struct, NULL, DB2_CONN_NAME, module_number); < le_pconn_struct = zend_register_list_destructors_ex(NULL, _php_db2_free_pconn_struct, DB2_PCONN_NAME, module_number); 606a605,606 > le_conn_struct = zend_register_list_destructors_ex( _php_db2_free_conn_struct, NULL, DB2_CONN_NAME, module_number); > le_pconn_struct = zend_register_list_destructors_ex(NULL, _php_db2_free_pconn_struct, DB2_PCONN_NAME, module_number); 2535a2536,2541 > RETURN_FALSE; > } > > rc = SQLFreeHandle( SQL_HANDLE_ENV, conn_res->henv); > if ( rc == SQL_ERROR ) { > _php_db2_check_sql_errors(conn_res->henv, SQL_HANDLE_DENV, rc, 1, NULL, -1, 1 TSRMLS_CC); Regards, Ambrish BhargavaHi, There is small correction in the patch. Please take following patch to verify: 350,355d349 < /* Disconnect from DB. If stmt is allocated, it is freed automatically*/ < if ( handle->handle_active ) { < rc = SQLDisconnect((SQLHDBC)handle->hdbc); < rc = SQLFreeHandle(SQL_HANDLE_DBC, handle->hdbc); < rc = SQLFreeHandle(SQL_HANDLE_ENV, handle->henv); < } 356a351,356 > /* Disconnect from DB. If stmt is allocated, it is freed automatically*/ > if ( handle->handle_active ) { > rc = SQLDisconnect((SQLHDBC)handle->hdbc); > rc = SQLFreeHandle(SQL_HANDLE_DBC, handle->hdbc); > rc = SQLFreeHandle(SQL_HANDLE_ENV, handle->henv); > } 499,500d498 < rc = SQLFreeHandle( SQL_HANDLE_STMT, handle->hstmt); < 501a500 > rc = SQLFreeHandle( SQL_HANDLE_STMT, handle->hstmt); 604,605d602 < le_conn_struct = zend_register_list_destructors_ex( _php_db2_free_conn_struct, NULL, DB2_CONN_NAME, module_number); < le_pconn_struct = zend_register_list_destructors_ex(NULL, _php_db2_free_pconn_struct, DB2_PCONN_NAME, module_number); 606a604,605 > le_conn_struct = zend_register_list_destructors_ex( _php_db2_free_conn_struct, NULL, DB2_CONN_NAME, module_number); > le_pconn_struct = zend_register_list_destructors_ex(NULL, _php_db2_free_pconn_struct, DB2_PCONN_NAME, module_number); 2535a2535,2540 > RETURN_FALSE; > } > > rc = SQLFreeHandle( SQL_HANDLE_ENV, conn_res->henv); > if ( rc == SQL_ERROR ) { > _php_db2_check_sql_errors(conn_res->henv, SQL_HANDLE_ENV, rc, 1, NULL, -1, 1 TSRMLS_CC); Regards, Ambrish BhargavaHi, I have added few more checks and also few print statements in the code (as the problem is not reproduced at my end). Please apply following in v1.8.2 of IBM_DB2 extension and send me back the output of the "Repo code" provided by you. The patch is: 347,361c347,366 < int rc; < < conn_handle *handle = (conn_handle*) rsrc->ptr; < /* Disconnect from DB. If stmt is allocated, it is freed automatically*/ < if ( handle->handle_active ) { < rc = SQLDisconnect((SQLHDBC)handle->hdbc); < rc = SQLFreeHandle(SQL_HANDLE_DBC, handle->hdbc); < rc = SQLFreeHandle(SQL_HANDLE_ENV, handle->henv); < } < if ( handle != NULL ) { < if ( handle->flag_pconnect ) { < /* Important to use regular free, we don't want the handled collected by efree */ < pefree(handle, 1); < } else { < efree(handle); --- > if(rsrc != NULL) { > int rc; > conn_handle *handle = (conn_handle*) rsrc->ptr; > if ( handle != NULL ) { > printf("_php_db2_free_conn_struct\n"); > /* Disconnect from DB. If stmt is allocated, it is freed automatically*/ > if ( handle->handle_active ) { > rc = SQLDisconnect((SQLHDBC)handle->hdbc); > rc = SQLFreeHandle(SQL_HANDLE_DBC, handle->hdbc); > rc = SQLFreeHandle(SQL_HANDLE_ENV, handle->henv); > printf("CLI handles free\n"); > } > if ( handle->flag_pconnect ) { > /* Important to use regular free, we don't want the handled collected by efree */ > pefree(handle, 1); > } else { > efree(handle); > handle = NULL; > printf("Handle memory free\n"); > } 495,503c500,510 < int rc; < < stmt_handle *handle = (stmt_handle*) rsrc->ptr; < < rc = SQLFreeHandle( SQL_HANDLE_STMT, handle->hstmt); < < if ( handle ) { < _php_db2_free_result_struct(handle); < efree(handle); --- > if(rsrc != NULL) { > int rc; > stmt_handle *handle = (stmt_handle*) rsrc->ptr; > > if ( handle != NULL ) { > printf("_php_db2_free_stmt_struct\n"); > rc = SQLFreeHandle( SQL_HANDLE_STMT, handle->hstmt); > _php_db2_free_result_struct(handle); > efree(handle); > handle = NULL; > } 590c597 < instance_name = (char *)malloc(strlen(DB2_VAR_INSTANCE) + strlen(tmp_name) + 1); --- > instance_name = (char *)emalloc(strlen(DB2_VAR_INSTANCE) + strlen(tmp_name) + 1); 604,606c611,613 < le_conn_struct = zend_register_list_destructors_ex( _php_db2_free_conn_struct, NULL, DB2_CONN_NAME, module_number); < le_pconn_struct = zend_register_list_destructors_ex(NULL, _php_db2_free_pconn_struct, DB2_PCONN_NAME, module_number); < le_stmt_struct = zend_register_list_destructors_ex( _php_db2_free_stmt_struct, NULL, DB2_STMT_NAME, module_number); --- > le_stmt_struct = zend_register_list_destructors_ex(_php_db2_free_stmt_struct, NULL, DB2_STMT_NAME, module_number); > le_conn_struct = zend_register_list_destructors_ex(_php_db2_free_conn_struct, NULL, DB2_CONN_NAME, module_number); > le_pconn_struct = zend_register_list_destructors_ex(NULL,_php_db2_free_pconn_struct, DB2_PCONN_NAME, module_number); 618c625 < free(_php_db2_instance_name); --- > efree(_php_db2_instance_name); 620a628 > printf("PHP_MSHUTDOWN_FUNCTION\n"); 2528a2537,2538 > SQLFreeHandle( SQL_HANDLE_DBC, conn_res->hdbc); > SQLFreeHandle( SQL_HANDLE_ENV, conn_res->henv); 2534a2545 > rc = SQLFreeHandle( SQL_HANDLE_ENV, conn_res->henv); 2538a2550,2555 > rc = SQLFreeHandle( SQL_HANDLE_ENV, conn_res->henv); > if ( rc == SQL_ERROR ) { > _php_db2_check_sql_errors(conn_res->henv, SQL_HANDLE_ENV, rc, 1, NULL, -1, 1 TSRMLS_CC); > RETURN_FALSE; > } > 2542c2559 < if (endpconnect) conn_res->flag_pconnect=1; --- > if (endpconnect) conn_res->flag_pconnect = 1; Regards, Ambrish BhargavaOk, i did a gdb debugging session and got the following information regarding the segfault, I hope it helps: Program received signal SIGSEGV, Segmentation fault. 0x08564373 in _zend_is_inconsistent (ht=0x0, file=0x8aa1b08 "/home/benny/downloads/php-5.3.2/Zend/zend_hash.c", line=875) at /home/benny/downloads/php-5.3.2/Zend/zend_hash.c:53 53 if (ht->inconsistent==HT_OK) { the backtrace is: (gdb) bt #0 0x08564373 in _zend_is_inconsistent (ht=0x0, file=0x8aa1b08 "/home/benny/downloads/php-5.3.2/Zend/zend_hash.c", line=875) at /home/benny/downloads/php-5.3.2/Zend/zend_hash.c:53 #1 0x08566891 in zend_hash_find (ht=0x0, arKey=0xb6a8bb0 "variable", nKeyLength=9, pData=0xbfffcdbc) at /home/benny/downloads/php-5.3.2/Zend/zend_hash.c:875 #2 0x012e9e33 in _php_db2_execute_helper (stmt_res=0xb6957b0, data=0x0, bind_cmp_list=1, bind_params=0) at /home/whitewashing/downloads/ibm_db2-1.8.4/ibm_db2.c:3886 #3 0x012ea462 in zif_db2_execute (ht=1, return_value=0xb66c844, return_value_ptr=0x0, this_ptr=0x0, return_value_used=1) at /home/whitewashing/downloads/ibm_db2-1.8.4/ibm_db2.c:4068 #4 0x085850ec in zend_do_fcall_common_helper_SPEC (execute_data=0x8ce976c) at /home/benny/downloads/php-5.3.2/Zend/zend_vm_execute.h:313 #5 0x085856a9 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x8ce976c) at /home/benny/downloads/php-5.3.2/Zend/zend_vm_execute.h:418 #6 0x08584789 in execute (op_array=0xa9b7154) at /home/benny/downloads/php-5.3.2/Zend/zend_vm_execute.h:104 #7 0x0854aa7a in zend_call_function (fci=0xbfffd10c, fci_cache=0xbfffd130) at /home/benny/downloads/php-5.3.2/Zend/zend_execute_API.c:947 #8 0x0832f87c in zim_reflection_method_invokeArgs (ht=2, return_value=0xb6866d8, return_value_ptr=0x0, this_ptr=0xb62e12c, return_value_used=1) at /home/benny/downloads/php-5.3.2/ext/reflection/php_reflection.c:2738 #9 0x085850ec in zend_do_fcall_common_helper_SPEC (execute_data=0x8ce6de0) at /home/benny/downloads/php-5.3.2/Zend/zend_vm_execute.h:313 #10 0x085856a9 in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x8ce6de0) at /home/benny/downloads/php-5.3.2/Zend/zend_vm_execute.h:418 #11 0x08584789 in execute (op_array=0x9c859e8) at /home/benny/downloads/php-5.3.2/Zend/zend_vm_execute.h:104 #12 0x0855831a in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/benny/downloads/php-5.3.2/Zend/zend.c:1194 #13 0x084ee9b2 in php_execute_script (primary_file=0xbffff5b4) at /home/benny/downloads/php-5.3.2/main/main.c:2260 #14 0x08615b2f in main (argc=5, argv=0xbffff744) at /home/benny/downloads/php-5.3.2/sapi/cli/php_cli.c:1192Hi, Thanks for the trace. I am not able to repro this problem at my end, hence sending you the patch. Please apply following patch to the ibm_db2.c file (v1.8.4 of IBM_DB2 extension) and let me know your feed back. Here is the patch: --- PATCH STARTS --- 3886,3899c3886,3906 < if ( zend_hash_find(EG(active_symbol_table), curr->varname, < strlen(curr->varname)+1, (void **) &bind_data ) != FAILURE ) { < rc = _php_db2_bind_data( stmt_res, curr, bind_data TSRMLS_CC); < if ( rc == SQL_ERROR ) { < php_error_docref(NULL TSRMLS_CC, E_WARNING, "Binding Error 1"); < return rc; < } < curr = curr->next; < } else if ( zend_hash_find(&EG(symbol_table), curr->varname, < strlen(curr->varname)+1, (void **) &bind_data ) != FAILURE ) { < rc = _php_db2_bind_data( stmt_res, curr, bind_data TSRMLS_CC); < if ( rc == SQL_ERROR ) { < php_error_docref(NULL TSRMLS_CC, E_WARNING, "Binding Error 1"); < return rc; --- > if ( curr->varname != NULL) { > if ( zend_hash_find(EG(active_symbol_table), curr->varname, > strlen(curr->varname)+1, (void **) &bind_data ) != FAILURE ) { > rc = _php_db2_bind_data( stmt_res, curr, bind_data TSRMLS_CC); > if ( rc == SQL_ERROR ) { > php_error_docref(NULL TSRMLS_CC, E_WARNING, "Binding Error 1"); > return rc; > } > curr = curr->next; > } else if ( zend_hash_find(&EG(symbol_table), curr->varname, > strlen(curr->varname)+1, (void **) &bind_data ) != FAILURE ) { > rc = _php_db2_bind_data( stmt_res, curr, bind_data TSRMLS_CC); > if ( rc == SQL_ERROR ) { > php_error_docref(NULL TSRMLS_CC, E_WARNING, "Binding Error 1"); > return rc; > } > curr = curr->next; > } else { > /* value not found in the active symbol table */ > php_error_docref(NULL TSRMLS_CC, E_WARNING, "Value Not Bound"); > return SQL_ERROR; 3901d3907 < curr = curr->next; --- PATCH ENDS --- Regards, Ambrish Bhargavanope thats not it, sorry. it fails for the same reason: #0 0x0835d4e6 in zend_hash_find (ht=0x0, arKey=0xabac7f0 "variable", nKeyLength=9, pData=0xbfffa8c4) at /home/benny/downloads/php-5.3.2/Zend/zend_hash.c:880 #1 0x023f0149 in _php_db2_execute_helper (stmt_res=<value optimized out>, data=<value optimized out>, bind_cmp_list=1, bind_params=0) at /home/benny/code/c/php/ibm_db2/trunk/ibm_db2.c:3887 #2 0x023f0929 in zif_db2_execute (ht=1, return_value=0xab8d544, return_value_ptr=0x0, this_ptr=0x0, return_value_used=1) at /home/benny/code/c/php/ibm_db2/trunk/ibm_db2.c:4074 #3 0x0837230e in execute_internal (execute_data_ptr=0x8a54e80, return_value_used=1) at /home/benny/downloads/php-5.3.2/Zend/zend_execute.c:1260 #4 0x012eaafe in xdebug_execute_internal (current_execute_data=0x8a54e80, return_value_used=1) at /usr/local/zend/temp/xdebug/xdebug.c:1631What happens if the variable given to db2_bind_param falls out of scope? say i write an abstraction layer with: public function bindParam($param, $value) { db2_bind_param($this->_stmt, $param, "value", DB2_PARAM_IN); } I call it: $stmt->bindParam(1, $value); unset($value); $stmt->execute(); It would be more than helpful if there were a way to pass a variable, not the name of a variable to db2_bind_param.I don't know if that is even valid to do, but the following fixes it for me: Index: ibm_db2.c =================================================================== --- ibm_db2.c (revision 298119) +++ ibm_db2.c (working copy) @@ -3883,7 +3883,7 @@ while (curr != NULL ) { /* Fetch data from symbol table */ - if ( zend_hash_find(EG(active_symbol_table), curr->varname, + if ( zend_hash_find(@EG(active_symbol_table), curr->varname, strlen(curr->varname)+1, (void **) &bind_data ) != FAILURE ) { rc = _php_db2_bind_data( stmt_res, curr, bind_data TSRMLS_CC); if ( rc == SQL_ERROR ) {