At 2014-07-22 08:07:54 I received a complaint, about one of my site. That's not working.
At 08:32:21 all of my sites did'nt work.
I
saw log, all nginx processes was kicked:
root@server:~# cat /var/log/nginx/error.log | grep "2014/07/22 08" | tail -8
2014/07/22 08:32:21 [alert] 9073#0: worker process 9074 exited on signal 9
2014/07/22 08:32:21 [alert] 9073#0: worker process 9075 exited on signal 9
2014/07/22 08:32:21 [alert] 9073#0: worker process 9076 exited on signal 9
2014/07/22 08:32:21 [alert] 9073#0: worker process 9079 exited on signal 9
2014/07/22 08:32:21 [alert] 9073#0: worker process 9080 exited on signal 9
2014/07/22 08:32:21 [alert] 9073#0: worker process 9081 exited on signal 9
2014/07/22 08:32:21 [alert] 9073#0: worker process 9082 exited on signal 9
2014/07/22 08:32:21 [alert] 9073#0: worker process 9084 exited on signal 9

root@server:~# cat /var/log/messages | grep -i oom
nothing

How can i find reaseon of processes shutdown? How all nginx processes was kicked? Is that bug? Maybe i must see other logs?

Thanks. Sorry for my bad english. Русский получше понимаю.