#47367 [NEW]: segfault when connecting while unbuffered query is running

From: Sjon at react dot nl Operating system: Linux PHP version: 5.2.9RC1 PHP Bug Type: *General Issues Bug description: segfault when connecting while unbuffered query is running Description: ------------ PHP Segfaults when establishing a second connection when an unbuffered query is running Since I cannot report a bug in 5.2.8; I compiled php5.2-200902120730 and reproduced the bug with that version $ ./configure --with-mysql=shared $ make $ ./sapi/cli/php -v PHP 5.2.9RC2-dev (cli) (built: Feb 12 2009 10:52:08) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies $ ./sapi/cli/php -n -d extension_dir=./modules/ -d extension=mysql.so mysql-unbuffered-crash.php Reproduce code: --------------- <?PHP $rl1 = mysql_connect('localhost','Sjon','test') or die (mysql_error()); mysql_query("DROP DATABASE IF EXISTS mysql_unbuffered_crash"); mysql_query("CREATE DATABASE mysql_unbuffered_crash"); mysql_select_db('mysql_unbuffered_crash') or die (mysql_error()); mysql_query("CREATE TABLE test (data VARCHAR( 256 ) NOT NULL) ENGINE = innodb;"); mysql_query("INSERT INTO test VALUES ('asdf');"); $rs = mysql_unbuffered_query("SELECT data FROM test"); # passing $rl1 will fix it while ($r = mysql_fetch_assoc($rs)) { // Setup another connection so we don't disturb the unbuffered_query $rl2 = mysql_connect('localhost','Sjon','test', TRUE) or die (mysql_error($rl2)); mysql_select_db('mysql_unbuffered_crash', $rl2) or die (mysql_error($rl2)); var_dump($r); } echo 'SUCCESS'; Expected result: ---------------- array(1) { ["data"]=> string(4) "asdf" } SUCCESS Actual result: -------------- array(1) { ["data"]=> string(4) "asdf" } SUCCESS Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb7d4f6c0 (LWP 21345)] zend_mm_add_to_free_list (heap=<value optimized out>, mm_block=0x9ee4e30) at /tmp/php5.2-200902120730/Zend/zend_alloc.c:747 747 if (ZEND_MM_FREE_BLOCK_SIZE(prev) != size) { (gdb) bt #0 zend_mm_add_to_free_list (heap=<value optimized out>, mm_block=0x9ee4e30) at /tmp/php5.2-200902120730/Zend/zend_alloc.c:747 #1 0x0826790b in _zend_mm_free_int (heap=0x9e2c1e8, p=<value optimized out>) at /tmp/php5.2-200902120730/Zend/zend_alloc.c:1987 #2 0x08277445 in shutdown_executor () at /tmp/php5.2-200902120730/Zend/zend_execute_API.c:283 #3 0x08281aa3 in zend_deactivate () at /tmp/php5.2-200902120730/Zend/zend.c:860 #4 0x08240857 in php_request_shutdown (dummy=0x0) at /tmp/php5.2-200902120730/main/main.c:1492 #5 0x082ecd71 in main (argc=7, argv=0xbf9c1a44) at /tmp/php5.2-200902120730/sapi/cli/php_cli.c:1314 -- Edit bug report at http://bugs.php.net/?id=47367&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=47367&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=47367&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=47367&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=47367&r=fixedcvs Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=47367&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=47367&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=47367&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=47367&r=needscript Try newer version: http://bugs.php.net/fix.php?id=47367&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=47367&r=support Expected behavior: http://bugs.php.net/fix.php?id=47367&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=47367&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=47367&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=47367&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47367&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=47367&r=dst IIS Stability: http://bugs.php.net/fix.php?id=47367&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=47367&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=47367&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=47367&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=47367&r=mysqlcfg