From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:60634 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755744AbeD3T0l (ORCPT ); Mon, 30 Apr 2018 15:26:41 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ilya Dryomov , Jason Dillaman Subject: [PATCH 4.9 50/61] libceph: reschedule a tick in finish_hunting() Date: Mon, 30 Apr 2018 12:24:53 -0700 Message-Id: <20180430183955.562969932@linuxfoundation.org> In-Reply-To: <20180430183951.312721450@linuxfoundation.org> References: <20180430183951.312721450@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ilya Dryomov commit 7b4c443d139f1d2b5570da475f7a9cbcef86740c upstream. If we go without an established session for a while, backoff delay will climb to 30 seconds. The keepalive timeout is also 30 seconds, so it's pretty easily hit after a prolonged hunting for a monitor: we don't get a chance to send out a keepalive in time, which means we never get back a keepalive ack in time, cutting an established session and attempting to connect to a different monitor every 30 seconds: [Sun Apr 1 23:37:05 2018] libceph: mon0 10.80.20.99:6789 session established [Sun Apr 1 23:37:36 2018] libceph: mon0 10.80.20.99:6789 session lost, hunting for new mon [Sun Apr 1 23:37:36 2018] libceph: mon2 10.80.20.103:6789 session established [Sun Apr 1 23:38:07 2018] libceph: mon2 10.80.20.103:6789 session lost, hunting for new mon [Sun Apr 1 23:38:07 2018] libceph: mon1 10.80.20.100:6789 session established [Sun Apr 1 23:38:37 2018] libceph: mon1 10.80.20.100:6789 session lost, hunting for new mon [Sun Apr 1 23:38:37 2018] libceph: mon2 10.80.20.103:6789 session established [Sun Apr 1 23:39:08 2018] libceph: mon2 10.80.20.103:6789 session lost, hunting for new mon The regular keepalive interval is 10 seconds. After ->hunting is cleared in finish_hunting(), call __schedule_delayed() to ensure we send out a keepalive after 10 seconds. Cc: stable@vger.kernel.org # 4.7+ Link: http://tracker.ceph.com/issues/23537 Signed-off-by: Ilya Dryomov Reviewed-by: Jason Dillaman Signed-off-by: Greg Kroah-Hartman --- net/ceph/mon_client.c | 1 + 1 file changed, 1 insertion(+) --- a/net/ceph/mon_client.c +++ b/net/ceph/mon_client.c @@ -1124,6 +1124,7 @@ static void finish_hunting(struct ceph_m monc->hunting = false; monc->had_a_connection = true; un_backoff(monc); + __schedule_delayed(monc); } }