# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1328397492 0
# Node ID e99e429947f98f8f59c696125a8c5aaab3139838
# Parent  2d235c76c59e76cadc3220c8214d7bbeffe83f7d
Merge of r4306, r4320:

Protection from stale write events in epoll.

Stale write event may happen if epoll_wait() reported both read and write
events, and processing of the read event closed descriptor.

diff --git a/src/event/modules/ngx_epoll_module.c b/src/event/modules/ngx_epoll_module.c
--- a/src/event/modules/ngx_epoll_module.c
+++ b/src/event/modules/ngx_epoll_module.c
@@ -683,6 +683,18 @@ ngx_epoll_process_events(ngx_cycle_t *cy
 
         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;