From: laruence Operating system: PHP version: 5.3.8 Package: Scripting Engine problem Bug Type: Bug Bug description:SIGALRM cause segfault in php_error_cb
Description: ------------ in php_error_cb: freeing PG(last_error_message) and PG(last_error_file) without blocking alarm signal. so there is a chance that php will segfault when max_execution_time limit reachead. since zend_signal was introduced in PHP 5.4, so I think it's okey to add signal block mechanism for this codes. Test script: --------------- <?php error_reporting(E_ALL|E_NOTICE); set_time_limit(1); while(1) { $a = $arr['index_miss']; } ?> do following steps: 1. gdb php 2. b php_error_cb 3. r "above script" 4. when breakpoint reach: 893 if (PG(last_error_message)) { (gdb) 894 free(PG(last_error_message)); 5. signal SIGPROF 6. next (*n) *** glibc detected *** double free or corruption (fasttop): 0x0000000001207ca0 *** Expected result: ---------------- no segfault Actual result: -------------- segfault -- Edit bug report at https://bugs.php.net/bug.php?id=60038&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=60038&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=60038&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=60038&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=60038&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=60038&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=60038&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=60038&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=60038&r=needscript Try newer version: https://bugs.php.net/fix.php?id=60038&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=60038&r=support Expected behavior: https://bugs.php.net/fix.php?id=60038&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=60038&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=60038&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=60038&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=60038&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=60038&r=dst IIS Stability: https://bugs.php.net/fix.php?id=60038&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=60038&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=60038&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=60038&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=60038&r=mysqlcfg