Bug #70626 [NEW]: PHP segfaults or reports "zend_mm_heap corrupted" for some date functions

From: michael at michaelmarley dot com Operating system: Linux x86_64 PHP version: 7.0.0RC4 Package: Reproducible crash Bug Type: Bug Bug description:PHP segfaults or reports "zend_mm_heap corrupted" for some date functions Description: ------------ Starting with PHP 7.0.0 RC4, I get "zend_mm_heap corrupted" errors or segfaults when executing some date functions. I included a simple example that causes the problem. The problem occurs both for CLI and FPM modes. In FPM mode, it always causes a segfault. In CLI mode, it usually prints "zend_mm_heap corrupted", but segfaults sometimes. I tried to capture a backtrace by running it in CLI in GDB, but it never seems to segfault while running in GDB; it always displays the corruption message instead. The message or segfault always occurs at the end of the script, so even if I put more code below the line that triggers the crash, that code will execute successfully. It always crashes at the end of the script though. I am using the packages from here: https://launchpad.net/~mamarley/+archive/ubuntu/php-exp. If it matters, they were compiled with GCC 5.2. I have no third-party extensions enabled (only opcache, gd, pgsql, and pdo_pgsql). I have also tried with all the extensions disabled and still gotten the same problem. I am sorry for the lack of debugging information here, but I am at a loss about how to collect anything useful. If you let me know what I should do, I would be glad to do it though. Test script: --------------- <?php $date=date_create(date("Y-m-d")); print_r($date); ?> Expected result: ---------------- DateTime Object ( [date] => 2015-10-02 00:00:00.000000 [timezone_type] => 3 [timezone] => America/New_York ) Actual result: -------------- DateTime Object ( [date] => 2015-10-02 00:00:00.000000 [timezone_type] => 3 [timezone] => America/New_York ) zend_mm_heap corrupted or DateTime Object ( [date] => 2015-10-02 00:00:00.000000 [timezone_type] => 3 [timezone] => America/New_York ) Segmentation fault -- Edit bug report at https://bugs.php.net/bug.php?id=70626&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70626&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70626&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70626&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70626&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70626&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70626&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70626&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70626&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70626&r=support Expected behavior: https://bugs.php.net/fix.php?id=70626&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70626&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70626&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70626&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70626&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70626&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70626&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70626&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70626&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70626&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70626&r=mysqlcfg