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Bug #70626 PHP segfaults or reports "zend_mm_heap corrupted" for some date functions
Submitted: 2015-10-02 22:24 UTC Modified: 2015-10-03 12:30 UTC
From: michael at michaelmarley dot com Assigned:
Status: Closed Package: Reproducible crash
PHP Version: 7.0.0RC4 OS: Linux x86_64
Private report: No CVE-ID: None
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 [2015-10-02 22:24 UTC] michael at michaelmarley dot com
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:  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:

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


DateTime Object
    [date] => 2015-10-02 00:00:00.000000
    [timezone_type] => 3
    [timezone] => America/New_York
Segmentation fault


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 [2015-10-03 04:19 UTC]
-Status: Open +Status: Feedback
 [2015-10-03 04:19 UTC]
Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read for *NIX and for Win32

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

I can not reproduce this ...
 [2015-10-03 12:30 UTC] michael at michaelmarley dot com
-Status: Feedback +Status: Closed
 [2015-10-03 12:30 UTC] michael at michaelmarley dot com
I apologize, it seems the issue is with one of the Debian patches.  Sorry for wasting your time.
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