Upstream module usage to process data

[isolomka]

So I have my own module which is working with thread pool enabled. 
ngx_http_upstream_init is called from my thread_event_handler, flag r->aio
is enabled.
In fact, upstream is not initialized at all.

When i set aio flag to false and call to ngx_http_upstream_init, i'm getting
a core dump in ngx_epoll_process_events.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,274486,274545#msg-274545