Bug #78894 [Com]: Preload: double free or corruption crash

Edit report at https://bugs.php.net/bug.php?id=78894&edit=1 ID: 78894 Comment by: w1zzard at gmx dot net Reported by: luis dot armengol at koyi dot tv Summary: Preload: double free or corruption crash Status: Feedback Type: Bug Package: opcache Operating System: Centos 7.3 PHP Version: 7.4.2 Block user comment: N Private report: N New Comment: Guess that means no preloading with 7.4.2 either - wait for 7.4.3 Previous Comments: ------------------------------------------------------------------------ [2020-01-27 11:33:33] w1zzard at gmx dot net Indeed, the error happens with opcache.preload_user=root, too. I just got lucky on my first test run. What's the recommended way to enable preloading now? Empty opcache.preload_user results in Fatal Error "opcache.preload_user" has not been defined ------------------------------------------------------------------------ [2020-01-27 11:12:51] nikic@php.net > Correct, changing from opcache.preload_user=username to opcache.preload_user=root fixes the > problem. I don't think that works. The referenced issue occurs with any use of opcache.preload_user, independent of whether it's root or not. Specifying root might just work by luck. > Why do the docs say "Preloading code as root is not allowed for security reasons. This > directive facilitates to let the preloading to be run as another user." Preloading under root is not allowed by default, but explicit use of opcache.preload_user=root is allowed, if you do want to run preloading under root (e.g. if you use Docker and you're root anyway). ------------------------------------------------------------------------ [2020-01-27 11:06:13] w1zzard at gmx dot net Correct, changing from opcache.preload_user=username to opcache.preload_user=root fixes the problem. Thanks! Why do the docs say "Preloading code as root is not allowed for security reasons. This directive facilitates to let the preloading to be run as another user." ------------------------------------------------------------------------ [2020-01-27 08:30:49] nikic@php.net Do you make use of opcache.preload_user? If so, this might be bug #79128. ------------------------------------------------------------------------ [2020-01-27 07:48:58] w1zzard at gmx dot net Seeing the same issue on 7.4.2. The error will appear only after certain number of classes loaded. If I remove one class, I can load another. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=78894 -- Edit this bug report at https://bugs.php.net/bug.php?id=78894&edit=1