Fixed AIO on Linux, broken in r4306.
Events from eventfd do not have c->write set, and the stale event
check added in r4306 causes null pointer dereference.
diff --git a/src/event/modules/ngx_epoll_module.c b/src/event/modules/ngx_epoll_module.c
index 4f9c511..f4003af 100644
--- a/src/event/modules/ngx_epoll_module.c
+++ b/src/event/modules/ngx_epoll_module.c
@@ -681,20 +681,20 @@
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 (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;
