Bug #76270 [NEW]: regex-related functions crash instead of triggering memory-limit error

From: teo8976 at gmail dot com Operating system: PHP version: 5.6.35 Package: Reproducible crash Bug Type: Bug Bug description:regex-related functions crash instead of triggering memory-limit error Description: ------------ When memory usage exceeds the memory limit during the execution of regular-expression related functions (such as preg_replace, preg_replace_callback, etc), instead of triggering the error that you would normally get when exceeding the memory limit, php execution is simply abruptly aborted (it crashes?) and produces empty output, regardless of whether you have display_errors set to true and/or have set an error handler. Test script: --------------- // PSEUDOCODE ini_set('memory_limit', $some_low_limit); $s="a huge string (not big enough to exceed the memory limit itself"; preg_replace_callback( "/some_complex_regex_with_a_lot_of_matches/", function($match) { return whatever; }, $s ); Expected result: ---------------- Should trigger the memory-limit error in the same way as when you exceed the memory limit without regular expressions. With display_errors set to true, you should see an error message Actual result: -------------- crashes and produces a f*****g blank page, even if display_errors is set to true, and you have no way of debugging what the f**k is going on. Took me ages to narrow it down to regular expressions. -- Edit bug report at https://bugs.php.net/bug.php?id=76270&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76270&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76270&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76270&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=76270&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=76270&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=76270&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=76270&r=needscript Try newer version: https://bugs.php.net/fix.php?id=76270&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=76270&r=support Expected behavior: https://bugs.php.net/fix.php?id=76270&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=76270&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=76270&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=76270&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76270&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=76270&r=dst IIS Stability: https://bugs.php.net/fix.php?id=76270&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=76270&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=76270&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=76270&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=76270&r=mysqlcfg