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