Bug #78918 [Com]: Segfault with preloading Laravel

Edit report at https://bugs.php.net/bug.php?id=78918&edit=1 ID: 78918 Comment by: fosron at gmail dot com Reported by: brent at spatie dot be Summary: Segfault with preloading Laravel Status: Verified Type: Bug Package: opcache Operating System: macOS 10.14 PHP Version: 7.4.0 Block user comment: N Private report: N New Comment: I've tested preloading Laravel too, and i'm getting "zend_mm_heap corrupted" with this script (https://github.com/brendt/laravel-preload/blob/master/preload.php) on a Docker container (both require and opcache_compile_file options don't work). Previous Comments: ------------------------------------------------------------------------ [2019-12-09 17:05:09] themohamedsaid at gmail dot com Unfortunately I keep getting a segfault even when switching to opcache_compile_file() and restarting php-fpm. Wish I had more input to provide ------------------------------------------------------------------------ [2019-12-09 14:03:13] nikic@php.net We've found some fundamental design problems in the preloading functionality today ... The tl;dr is that you need to use opcache_compile_file() based preloading for now. Preloading based on require calls has a whole series of issues that may result in crashes. ------------------------------------------------------------------------ [2019-12-09 13:43:35] themohamedsaid at gmail dot com After disabling all aliases and making sure class_alias is not used, I still get a segfault. WARNING: [pool www] child 18450 exited on signal 11 (SIGSEGV - core dumped) after 1.191760 seconds from start ------------------------------------------------------------------------ [2019-12-09 09:08:49] nikic@php.net Okay, that one's easy to repro: <?php class A {} class_alias(A::class, 'B'); This results in the class being in the class table twice, and we don't take that into account. ------------------------------------------------------------------------ [2019-12-09 09:00:18] nikic@php.net At the least there is an assertion failure during initial preloading: php: /home/nikic/php-7.4/Zend/zend_hash.c:1019: _zend_hash_index_add_or_update_i: Assertion `(flag & (1<<3)) == 0' failed. Aborted #4 0x0000555555d9aaad in _zend_hash_index_add_or_update_i (ht=0x7fffeab4cd50 <accel_globals+368>, h=17592143058440, pData=0x7fffffffcf30, flag=10) at /home/nikic/php-7.4/Zend/zend_hash.c:1019 #5 0x0000555555d9ad77 in zend_hash_index_add_new (ht=0x7fffeab4cd50 <accel_globals+368>, h=17592143058440, pData=0x7fffffffcf30) at /home/nikic/php-7.4/Zend/zend_hash.c:1068 #6 0x00007fffea8acfff in zend_hash_index_add_new_ptr (ht=0x7fffeab4cd50 <accel_globals+368>, h=17592143058440, pData=0x7fffe360fbe8) at /home/nikic/php-7.4/Zend/zend_hash.h:746 #7 0x00007fffea8ade22 in _zend_shared_memdup (source=0x7fffeb80b040, size=456, arena=0 '\000', get_xlat=0 '\000', set_xlat=1 '\001', free_source=0 '\000') at /home/nikic/php-7.4/ext/opcache/zend_shared_alloc.c:387 #8 0x00007fffea8adf67 in zend_shared_memdup_put (source=0x7fffeb80b040, size=456) at /home/nikic/php-7.4/ext/opcache/zend_shared_alloc.c:417 #9 0x00007fffea8958d6 in zend_persist_class_entry (zv=0x7fffe3132de0) at /home/nikic/php-7.4/ext/opcache/zend_persist.c:708 #10 0x00007fffea898de1 in zend_accel_persist_class_table (class_table=0x7fffe312f4a0) at /home/nikic/php-7.4/ext/opcache/zend_persist.c:1032 #11 0x00007fffea8990f9 in zend_accel_script_persist (script=0x7fffe312f380, key=0x0, key_length=0, for_shm=1) at /home/nikic/php-7.4/ext/opcache/zend_persist.c:1074 #12 0x00007fffea88b3cf in preload_script_in_shared_memory (new_persistent_script=0x7fffe2487a00) at /home/nikic/php-7.4/ext/opcache/ZendAccelerator.c:4092 #13 0x00007fffea88c986 in accel_preload (config=0x555556bdebe8 "preload.php") at /home/nikic/php-7.4/ext/opcache/ZendAccelerator.c:4413 #14 0x00007fffea88d334 in accel_finish_startup () at /home/nikic/php-7.4/ext/opcache/ZendAccelerator.c:4644 #15 0x00007fffea887c6b in accel_post_startup () at /home/nikic/php-7.4/ext/opcache/ZendAccelerator.c:3024 #16 0x0000555555d830ec in zend_post_startup () at /home/nikic/php-7.4/Zend/zend.c:1000 ------------------------------------------------------------------------ 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=78918 -- Edit this bug report at https://bugs.php.net/bug.php?id=78918&edit=1