Bug #70795 [NEW]: Opcache causes segfaults when Constant Arrays are used under some concurrency
From: bastiaan at mollie dot com
Operating system: Linux debian wheezy
PHP version: 5.6.14
Package: opcache
Bug Type: Bug
Bug description:Opcache causes segfaults when Constant Arrays are used under some concurrency
Description:
------------
Call the script foo.bar, host it with apache2 on localhost and use ab to
call the script concurrently:
ab -c 20 -n 10000 'http://127.0.0.1/foo.php'
Tail the output of /var/log/apache2/*.log
Test script:
---------------
<?php
class Bar
{
const FOO = [
'foo' => 'bar',
];
public function foo($bar)
{
return self::FOO[$bar];
}
}
$foo = new Bar;
usleep(rand(1,1000000));
$bar = $foo->foo('foo');
Expected result:
----------------
status 200 / no segfaults
Actual result:
--------------
A segfault and segfaults to any subsequent requests to the same script.
[Mon Oct 26 17:07:39 2015] [error] [client 127.0.0.1] PHP Fatal error:
Out of memory (allocated 262144) (tried to allocate 139794773411952
bytes) in Unknown on line 0
[Mon Oct 26 17:07:39 2015] [notice] child pid 7385 exit signal
Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7386 exit signal
Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7390 exit signal
Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7391 exit signal
Segmentation fault (11)
[Mon Oct 26 17:07:39 2015] [notice] child pid 7392 exit signal
Segmentation fault (11)
--
Edit bug report at https://bugs.php.net/bug.php?id=70795&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70795&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70795&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70795&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=70795&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=70795&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=70795&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=70795&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=70795&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=70795&r=support
Expected behavior: https://bugs.php.net/fix.php?id=70795&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=70795&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=70795&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=70795&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70795&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=70795&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=70795&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=70795&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=70795&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=70795&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=70795&r=mysqlcfg
Thread (3 messages)
- bastiaan at mollie dot com