[nginx] Fixed CPU hog while freeing hc->busy after e662cbf1b932 (1.11.11).

[Maxim Dounin]

details:   http://hg.nginx.org/nginx/rev/1c43ac026c1d
branches:  
changeset: 6942:1c43ac026c1d
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Fri Mar 24 16:26:12 2017 +0300
description:
Fixed CPU hog while freeing hc->busy after e662cbf1b932 (1.11.11).

Reported by Richard Stanway,
http://mailman.nginx.org/pipermail/nginx/2017-March/053296.html.

diffstat:

 src/http/ngx_http_request.c |  1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diffs (11 lines):

diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -2904,6 +2904,7 @@ ngx_http_set_keepalive(ngx_http_request_
             }
 
             cl->buf = b;
+            cl->next = NULL;
 
             hc->busy = cl;
             hc->nbusy = 1;