Bug #68630 [Com]: "ALERT: oops, unknown child (...) exited with code 0."

Edit report at https://bugs.php.net/bug.php?id=68630&edit=1 ID: 68630 Comment by: dz at heroku dot com Reported by: dz at heroku dot com Summary: "ALERT: oops, unknown child (...) exited with code 0." Status: Open Type: Bug Package: FPM related Operating System: Ubuntu 14.04 PHP Version: 5.6.4 Block user comment: N Private report: N New Comment: Should have mentioned: pm = dynamic pm.max_children = 5 pm.start_servers = 2 pm.min_spare_servers = 1 pm.max_spare_servers = 3 Previous Comments: ------------------------------------------------------------------------ [2014-12-19 15:27:02] dz at heroku dot com Description: ------------ [19-Dec-2014 14:27:38.971730] NOTICE: pid 106, fpm_unix_conf_wp(), line 128: [pool www] 'user' directive is ignored when FPM is not running as root [19-Dec-2014 14:27:38.971730] NOTICE: pid 106, fpm_unix_conf_wp(), line 128: [pool www] 'user' directive is ignored when FPM is not running as root [19-Dec-2014 14:27:38.973187] DEBUG: pid 106, fpm_scoreboard_init_main(), line 40: got clock tick '100' [19-Dec-2014 14:27:38.973690] DEBUG: pid 106, fpm_event_init_main(), line 337: event module is epoll and 11 fds have been reserved [19-Dec-2014 14:27:38.973912] NOTICE: pid 106, fpm_init(), line 85: fpm is running, pid 106 [19-Dec-2014 14:27:38.976294] DEBUG: pid 106, fpm_children_make(), line 421: [pool www] child 117 started [19-Dec-2014 14:27:38.978554] DEBUG: pid 106, fpm_children_make(), line 421: [pool www] child 118 started [19-Dec-2014 14:27:38.978608] DEBUG: pid 106, fpm_event_loop(), line 366: 5992 bytes have been reserved in SHM [19-Dec-2014 14:27:38.978616] NOTICE: pid 106, fpm_event_loop(), line 367: ready to handle connections ... [19-Dec-2014 14:44:20.240893] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 3 spare children, 3 running children. Spawning rate 1 [19-Dec-2014 14:44:21.256687] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 3 active children, 0 spare children, 3 running children. Spawning rate 1 [19-Dec-2014 14:44:21.279763] DEBUG: pid 106, fpm_children_make(), line 421: [pool www] child 135 started [19-Dec-2014 14:44:21.279813] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 428: [pool www] 1 child(ren) have been created dynamically [19-Dec-2014 14:44:22.258713] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 4 spare children, 4 running children. Spawning rate 2 [19-Dec-2014 14:44:22.279948] DEBUG: pid 106, fpm_event_loop(), line 419: event module triggered 1 events [19-Dec-2014 14:44:22.280206] DEBUG: pid 106, fpm_event_loop(), line 419: event module triggered 1 events [19-Dec-2014 14:44:22.285477] DEBUG: pid 106, fpm_got_signal(), line 76: received SIGCHLD [19-Dec-2014 14:44:22.285598] ALERT: pid 106, fpm_children_bury(), line 295: oops, unknown child (113) exited with code 0. Please open a bug report (https://bugs.php.net). [19-Dec-2014 14:44:22.285672] DEBUG: pid 106, fpm_children_bury(), line 254: [pool www] child 117 has been killed by the process management after 1003.309423 seconds from start [19-Dec-2014 14:44:22.285715] DEBUG: pid 106, fpm_event_loop(), line 419: event module triggered 1 events [19-Dec-2014 14:44:23.260780] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 3 spare children, 3 running children. Spawning rate 1 [19-Dec-2014 14:44:24.263014] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 3 spare children, 3 running children. Spawning rate 1 [19-Dec-2014 14:44:25.264402] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 3 spare children, 3 running children. Spawning rate 1 [19-Dec-2014 14:44:26.266396] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 3 spare children, 3 running children. Spawning rate 1 [19-Dec-2014 14:44:27.267484] DEBUG: pid 106, fpm_pctl_perform_idle_server_maintenance(), line 379: [pool www] currently 0 active children, 3 spare children, 3 running children. Spawning rate 1 Could this be some kind of race condition in fpm_got_signal() and fpm_children_bury()? The weird thing is that the lowest child PID spawned was 117. Any idea where this is coming from or how to investigate? I cannot generate a GDB backtrace unfortunately. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=68630&edit=1