# HG changeset patch
# User Ruslan Ermilov <ru@nginx.com>
# Date 1569242732 -10800
# Node ID d6cf51af8a3de524266821d4d225dd56c8674fc7
# Parent  80359395b34577860b025aebfebd2a4868c89834
HTTP/2: fixed possible alert about left open socket on shutdown.

This could happen when graceful shutdown configured by worker_shutdown_timeout
times out and is then followed by another timeout such as proxy_read_timeout.
In this case, the HEADERS frame is added to the output queue, but attempt to
send it fails (due to c->error forcibly set during graceful shutdown timeout).
This triggers request finalization which attempts to close the stream.  But the
stream cannot be closed because there is a frame in the output queue, and the
connection cannot be finalized.  This leaves the connection open without any
timer events leading to alert.

The fix is to post write event when sending output queue fails on c->error.
That will finalize the connection.

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -513,12 +513,11 @@ ngx_http_v2_send_output_queue(ngx_http_v
     ngx_http_core_loc_conf_t  *clcf;
 
     c = h2c->connection;
+    wev = c->write;
 
     if (c->error) {
-        return NGX_ERROR;
-    }
-
-    wev = c->write;
+        goto error;
+    }
 
     if (!wev->ready) {
         return NGX_AGAIN;