Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753828AbaKJQVX (ORCPT ); Mon, 10 Nov 2014 11:21:23 -0500 Received: from zimbra13.linbit.com ([212.69.166.240]:54065 "EHLO zimbra13.linbit.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753809AbaKJQVU (ORCPT ); Mon, 10 Nov 2014 11:21:20 -0500 From: Philipp Reisner To: linux-kernel@vger.kernel.org, Jens Axboe Cc: drbd-dev@lists.linbit.com Subject: [PATCH 6/7] drbd: Fix state change in case of connection timeout Date: Mon, 10 Nov 2014 17:21:14 +0100 Message-Id: <1415636475-7883-7-git-send-email-philipp.reisner@linbit.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1415636475-7883-1-git-send-email-philipp.reisner@linbit.com> References: <1415636475-7883-1-git-send-email-philipp.reisner@linbit.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A connection timeout affects all volumes of a resource! Under the following conditions: A resource with multiple volumes AND ko-count >=1 AND a write request triggers the timeout (ko-count * timeout) DRBD's internal state gets confused. That in turn may lead to very miss leading follow up failures. E.g. "BUG: scheduling while atomic" CC: stable@kernel.org # v3.17 Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_req.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 90319b1..3b797cd 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -1629,7 +1629,7 @@ void request_timer_fn(unsigned long data) time_after(now, req_peer->pre_send_jif + ent) && !time_in_range(now, connection->last_reconnect_jif, connection->last_reconnect_jif + ent)) { drbd_warn(device, "Remote failed to finish a request within ko-count * timeout\n"); - _drbd_set_state(_NS(device, conn, C_TIMEOUT), CS_VERBOSE | CS_HARD, NULL); + _conn_request_state(connection, NS(conn, C_TIMEOUT), CS_VERBOSE | CS_HARD); } if (dt && oldest_submit_jif != now && time_after(now, oldest_submit_jif + dt) && -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/