From: Maxim Dounin <mdounin@mdounin.ru>
Date: Tue, 22 Nov 2011 17:02:21 +0000 (+0000)
Subject: Protection from stale write events in epoll.
X-Git-Tag: release-1.1.9~11
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=7f59728d5b78268ff94f9d3ab464022b48d0f6ea;p=nginx.git

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
index 31c10c6dc..4f9c5118e 100644
--- 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 *cycle, ngx_msec_t timer, ngx_uint_t flags)
 
         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) {