ID: 49697 Updated by: [email protected] Reported By: donquixote dot phplist at googlemail dot com -Status: Open +Status: Feedback Bug Type: Reproducible crash Operating System: Windows XP PHP Version: 5.2.11 New Comment:
>From php.ini-dist: [Pcre] ;PCRE library backtracking limit. ;pcre.backtrack_limit=100000 ;PCRE library recursion limit. ;Please note that if you set this value to a high number you may consume all ;the available process stack and eventually crash PHP (due to reaching the ;stack size limit imposed by the Operating System). ;pcre.recursion_limit=100000 So you should tune these to be such that it won't crash anymore. Previous Comments: ------------------------------------------------------------------------ [2009-09-28 05:26:37] donquixote dot phplist at googlemail dot com Description: ------------ I found a regex / text combination that causes my apache to crash / restart with preg_replace. The example is a reduced version of Drupal's CSS compression regex. The regex is not overly complex, and the text is not overly long. Reproducing this depends on system configuration: On my webspace it does not crash. But, on my localhost it always crashes with this regex / text combination. Removing a few letters in the text (no matter which) makes the bug not happen. More info in the linked file. So: It seems that preg_replace is not the most robust piece of code. No matter what you feed it, it should never ever crash! And, btw: I was going to report this as a comment on http://bugs.php.net/bug.php?id=46551, but the comment form results in an error page. ("Authentication failed: Incorrect username Warning: Cannot modify header information - headers already sent by (output started at /home/Web/sites/php-bugs-web/include/auth.inc:30) in /home/Web/sites/php-bugs-web/bug.php on line 232") Reproduce code: --------------- standalone script at http://drupal.org/files/issues/test.php__1.txt posted here http://drupal.org/node/444228#comment-2089300 Expected result: ---------------- preg_replace should do its job (compressing the CSS). Or show a meaningful error message, if there is a valid reason why this is not possible. Actual result: -------------- Apache crash / restart, with no useful error message in error.log, except the usual restart messages. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49697&edit=1
