Looking into the big loop code, it may happen that the worker process may
close the keepalive connection before consuming any pending read events?
for ( ;; ) {
if (ngx_exiting) {
if (ngx_event_no_timers_left() == NGX_OK) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
ngx_process_events_and_timers(cycle);
if (ngx_terminate) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
if (ngx_quit) {
ngx_quit = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
"gracefully shutting down");
ngx_setproctitle("worker process is shutting down");
if (!ngx_exiting) {
ngx_exiting = 1;
ngx_set_shutdown_timer(cycle);
ngx_close_listening_sockets(cycle);
ngx_close_idle_connections(cycle); <--what if a
read event is coming when goes here?
}
}
Posted at Nginx Forum:
https://forum.nginx.org/read.php?2,197927,290794#msg-290794
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