# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1321981341 0
# Node ID f68047884e836639ba7885a8cf85dab3098a7003
# Parent  ed922fb9d6c108916859ae0ac33805ac3c95e946
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.

Patch by Yichun Zhang (agentzh).

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
@@ -681,6 +681,18 @@ ngx_epoll_process_events(ngx_cycle_t *cy
 
         wev = c->write;
 
+        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 ((revents & EPOLLOUT) && wev->active) {
 
             if (flags & NGX_POST_THREAD_EVENTS) {