Bug #79252 [Com]: preloading causes php-fpm to segfault during exit

Edit report at https://bugs.php.net/bug.php?id=79252&edit=1 ID: 79252 Comment by: jakub at tuenti dot com Reported by: jakub at tuenti dot com Summary: preloading causes php-fpm to segfault during exit Status: Open Type: Bug Package: opcache Operating System: Linux PHP Version: 7.4.3RC1 Block user comment: N Private report: N New Comment: I also noted that when running the daemon with -D (daemonize), the daemon starts but the command that started the daemon segfaults (maybe because it also does the cleanup before exit?), so it should be easier to trace this way since you don't need to do the Ctrl+C: $ docker run --rm -i -v $PWD/preload.php:/preload.php -v $PWD/test.php:/test.php php:7.4.3-fpm php-fpm -D -dzend_extension=opcache -dopcache.enabled=1 -dopcache.preload=/preload.php -dopcache.preload_user=root; echo $? [24-Feb-2020 14:30:03] NOTICE: fpm is running, pid 9 [24-Feb-2020 14:30:03] NOTICE: ready to handle connections 139 Previous Comments: ------------------------------------------------------------------------ [2020-02-24 14:23:51] jakub at tuenti dot com It should be reproduceable by starting the official image with those two files, then running php-fpm and pressing Ctrl+C to make it exit. $ docker run --rm -ti -v $PWD/preload.php:/preload.php -v $PWD/test.php:/test.php php:7.4.3-fpm bash root@7820c56cbbda:/var/www/html# php-fpm -dzend_extension=opcache -dopcache.enabled=1 -dopcache.preload=/preload.php -dopcache.preload_user=root [24-Feb-2020 14:17:16] NOTICE: fpm is running, pid 7 [24-Feb-2020 14:17:16] NOTICE: ready to handle connections ^C[24-Feb-2020 14:17:18] NOTICE: Terminating ... [24-Feb-2020 14:17:18] NOTICE: exiting, bye-bye! Segmentation fault (core dumped) Note that you need to have the preload.php and test.php files in the folder where you run the command. In this next example (running the command and then pressing Ctrl+C) the "Segmentation fault" message doesn't appear, but the exit code is the segfault one (139), so it was probably just hidden by Docker: $ docker run --rm -i -v $PWD/preload.php:/preload.php -v $PWD/test.php:/test.php php:7.4.3-fpm php-fpm -dzend_extension=opcache -dopcache.enabled=1 -dopcache.preload=/preload.php -dopcache.preload_user=root; echo $? [24-Feb-2020 14:18:06] NOTICE: fpm is running, pid 1 [24-Feb-2020 14:18:06] NOTICE: ready to handle connections ^C[24-Feb-2020 14:18:06] NOTICE: Terminating ... [24-Feb-2020 14:18:06] NOTICE: exiting, bye-bye! 139 ------------------------------------------------------------------------ [2020-02-24 12:14:43] nikic@php.net Can't reproduce this with FPM either. ------------------------------------------------------------------------ [2020-02-11 14:55:24] nikic@php.net Doesn't reproduce with builtin server, possibly FPM specific. ------------------------------------------------------------------------ [2020-02-10 12:41:43] jakub at tuenti dot com Description: ------------ Preloading a class with a static variable causes php-fpm to segfault during exit. I have tested in debian docker images with php 7.4.2 and 7.4.3RC1. Preloading works fine before the exit. root@a37b6a321c52:/# php-fpm -dzend_extension=opcache -dopcache.preload=/preload.php -dopcache.preload_user=root [10-Feb-2020 12:34:41] NOTICE: fpm is running, pid 579 [10-Feb-2020 12:34:41] NOTICE: ready to handle connections ^C[10-Feb-2020 12:34:42] NOTICE: Terminating ... [10-Feb-2020 12:34:42] NOTICE: exiting, bye-bye! Segmentation fault (core dumped) I have included a backtrace for php 7.4.2 Test script: --------------- # /preload.php <?php opcache_compile_file("/test.php"); # /test.php <?php class A { static $x; } Actual result: -------------- #0 zend_cleanup_internal_class_data (ce=0x7f3d0fcbe9a0) at ./Zend/zend_types.h:441 static_members = 0x303a783a746f6f72 p = 0x303a783a746f6f72 end = 0x303a783a746f6f82 #1 0x000055e6aca38988 in destroy_zend_class (zv=<optimized out>) at ./Zend/zend_opcode.c:253 op_array = <optimized out> prop_info = <optimized out> ce = 0x7f3d0fcbe9a0 fn = <optimized out> #2 0x000055e6aca53905 in zend_hash_destroy (ht=0x55e6addef390) at ./Zend/zend_hash.c:1541 p = 0x55e6ade943d0 end = 0x55e6ade943f0 #3 0x000055e6aca43b36 in zend_shutdown () at ./Zend/zend.c:1054 No locals. #4 0x000055e6ac9e372a in php_module_shutdown () at ./main/main.c:2477 module_number = <optimized out> module_number = <optimized out> cb = <optimized out> #5 php_module_shutdown () at ./main/main.c:2454 cb = <optimized out> #6 0x000055e6acad6239 in fpm_php_cleanup (which=<optimized out>, arg=<optimized out>) at ./sapi/fpm/fpm/fpm_php.c:198 No locals. #7 0x000055e6acace9bd in fpm_cleanups_run (type=type@entry=4) at ./sapi/fpm/fpm/fpm_cleanup.c:43 c = 0x55e6adef6580 cl = <optimized out> #8 0x000055e6acad6ee4 in fpm_pctl_exit () at ./sapi/fpm/fpm/fpm_process_ctl.c:71 __func__ = "fpm_pctl_exit" #9 fpm_pctl_action_last () at ./sapi/fpm/fpm/fpm_process_ctl.c:118 No locals. #10 0x000055e6acad7b3b in fpm_pctl (action=2, new_state=0) at ./sapi/fpm/fpm/fpm_process_ctl.c:260 __func__ = "fpm_pctl" #11 fpm_pctl_child_exited () at ./sapi/fpm/fpm/fpm_process_ctl.c:260 No locals. #12 0x000055e6acace51b in fpm_children_bury () at ./sapi/fpm/fpm/fpm_children.c:266 wp = 0x55e6adef6c90 tv1 = {tv_sec = 10543, tv_usec = 512922} tv2 = {tv_sec = 22, tv_usec = 495922} buf = "on signal 15 (SIGTERM)\000\000\060\254\267\204\377\177\000\000\020/\266\204\377\177\000\000\000\304\370\317\001\000\000\000\001\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\360.\266\204\377\177\000\000@/\266\204\377\177\000\000@J\304\254\346U\000\000\317\367S\343\245\233\304 \020/\266\204\377\177\000\000\366\237\244\031=\177\000\000\f\000\000\000\000\000\000\000\366\237\244\031=\177\000" severity = 1 restart_child = 1 status = 15 pid = 919 child = <optimized out> __func__ = "fpm_children_bury" #13 0x000055e6acad3703 in fpm_event_fire (ev=0x55e6acc44b60 <children_bury_timer>) at ./sapi/fpm/fpm/fpm_events.c:487 No locals. #14 fpm_event_loop (err=err@entry=0) at ./sapi/fpm/fpm/fpm_events.c:467 ev = 0x55e6acc44b60 <children_bury_timer> next = 0x55e6adefffe0 --Type <RET> for more, q to quit, c to continue without paging-- q = 0x55e6adeffd70 ms = <optimized out> tmp = <optimized out> timeout = <optimized out> ret = <optimized out> q2 = <optimized out> now = {tv_sec = 10543, tv_usec = 512855} signal_fd_event = {fd = 5, timeout = {tv_sec = 0, tv_usec = 0}, frequency = {tv_sec = 0, tv_usec = 0}, callback = 0x55e6acad3890 <fpm_got_signal>, arg = 0x0, flags = 2, index = 5, which = 2} __func__ = "fpm_event_loop" #15 0x000055e6acacdd47 in fpm_run (max_requests=0x7fff84b630fc) at ./sapi/fpm/fpm/fpm.c:113 wp = 0x0 #16 0x000055e6ac8adad2 in main (argc=6, argv=0x7fff84b636f8) at ./sapi/fpm/fpm/fpm_main.c:1854 exit_status = 0 c = -1 use_extended_info = 0 file_handle = {handle = {fp = 0x0, stream = {handle = 0x0, isatty = 442194688, reader = 0x1, fsizer = 0x0, closer = 0x7f3d199c3490 <ptmalloc_init>}}, filename = 0x7f3d1a5a7628 "\274", opened_path = 0x7fff84b635f0, type = (ZEND_HANDLE_STREAM | unknown: 442221944), free_filename = 61 '=', buf = 0x7f3d19afec40 <main_arena> "", len = 139900400692384} orig_optind = 1 orig_optarg = 0x0 ini_entries_len = 80 max_requests = 0 requests = 0 fcgi_fd = 0 request = <optimized out> fpm_config = <optimized out> fpm_prefix = 0x0 fpm_pid = 0x0 test_conf = 0 force_daemon = -1 force_stderr = 0 php_information = 0 php_allow_to_run_as_root = 1 ret = <optimized out> __func__ = "main" __orig_bailout = <optimized out> __bailout = <optimized out> __str = <optimized out> ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79252&edit=1