Bug #75092 [NEW]: Values for interned_strings_buffer and memory_consumption can lead to crash

From: j3mata at gmail dot com Operating system: CentOS 6 PHP version: 7.0.22 Package: opcache Bug Type: Bug Bug description:Values for interned_strings_buffer and memory_consumption can lead to crash Description: ------------ Hello, I have came accross this issue after we have recieved random complains for 500ISE errors, which are solved after increasing opcache.interned_strings_buffer value. Through series of tests, it seems that for certain combination of values for opcache.interned_strings_buffer and opcache.memory_consumption can lead to error: Fatal Error Zend OPcache cannot allocate buffer for interned strings. I am reproducing it by this formul ( X is 8, 16, 32 etc. ): opcache.memory_consumption = X opcache.interned_strings_buffer = (X*7/8)/2 For every value for opcache.interned_strings_buffer >= (X*7/8)/2 the above error is produced. Tested on PHP versions 7.0.22 and 7.1.8, Apache/2.4.27 Regards, Ilian. -- Edit bug report at https://bugs.php.net/bug.php?id=75092&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75092&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75092&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75092&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75092&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75092&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75092&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75092&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75092&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75092&r=support Expected behavior: https://bugs.php.net/fix.php?id=75092&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75092&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75092&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75092&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75092&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75092&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75092&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75092&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75092&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75092&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75092&r=mysqlcfg