Bug #70795 [Fbk->Csd]: Opcache causes segfaults when Constant Arrays are used under some concurrency

Edit report at https://bugs.php.net/bug.php?id=70795&edit=1 ID: 70795 User updated by: bastiaan at mollie dot com Reported by: bastiaan at mollie dot com Summary: Opcache causes segfaults when Constant Arrays are used under some concurrency -Status: Feedback +Status: Closed Type: Bug Package: opcache Operating System: Linux debian wheezy PHP Version: 5.6.14 Block user comment: N Private report: N New Comment: I can confirm that php-5.6.15RC1 indeed fixes this. Previous Comments: ------------------------------------------------------------------------ [2015-10-26 21:12:11] nikic@php.net This is likely the same issue as https://bugs.php.net/bug.php?id=70601. Could you check if 5.6.15RC1 (or 5.6-dev) fixes this issue? ------------------------------------------------------------------------ [2015-10-26 16:42:24] bastiaan at mollie dot com 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 this bug report at https://bugs.php.net/bug.php?id=70795&edit=1