upgraded ngx_lua to 0.5.0rc22 and lua-resty-mysql to 0.07. also upgraded the nginx core to 1.0.14.

patches/nginx-1.0.14-epoll_check_stale_wev.patch

@@ -0,0 +1,20 @@
+--- nginx-1.0.14/src/event/modules/ngx_epoll_module.c	2011-09-30 22:12:53.000000000 +0800
++++ nginx-1.0.14-patched/src/event/modules/ngx_epoll_module.c	2011-11-30 11:08:46.775817019 +0800
+@@ -682,6 +682,17 @@
+         wev = c->write;
+ 
+         if ((revents & EPOLLOUT) && wev->active) {
++            if (c->fd == -1 || wev->instance != instance) {
++
++                /*
++                 * the stale event from a file descriptor
++                 * that was just closed in this iteration
++                 */
++
++                ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
++                               "epoll: stale event %p", c);
++                continue;
++            }
+ 
+             if (flags & NGX_POST_THREAD_EVENTS) {
+                 wev->posted_ready = 1;