From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,T_MIXED_ES,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A4A5C6786C for ; Fri, 14 Dec 2018 12:05:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5F12221479 for ; Fri, 14 Dec 2018 12:05:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544789108; bh=LzfS57tvGt3yzYjRN9uBsWUZnVg/t/doG/+c6I7IB/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Q4Sc5p21oHNpXwumYcmH5LkO4qMM8WxLRGJ47T63U4VrfcZe5vZQoUlMGbz+ebFKp SF14Ps+GlAoI3EArBolayrFVKDYYzrAj56Ris23fZO8Zo7V0/YAghyqsjDFFPWmKh/ 3nFawazTvQDJWrfqG2u0Y9WnvwQNUJWwkijxbqg4= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5F12221479 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730633AbeLNMFH (ORCPT ); Fri, 14 Dec 2018 07:05:07 -0500 Received: from mail.kernel.org ([198.145.29.99]:49858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730619AbeLNMFE (ORCPT ); Fri, 14 Dec 2018 07:05:04 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B44BD21486; Fri, 14 Dec 2018 12:05:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544789104; bh=LzfS57tvGt3yzYjRN9uBsWUZnVg/t/doG/+c6I7IB/U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A5eQq9h6etPwMvRWp+a54ivfYoqsLp3NK6YjHaN4q2oko54boSzvMLeR1oNM3WW+s Uba1f4NE85gQS6LTNUj+AlvjIulNKSyHVydPj4N43DysP97jKCe5rDuKLcaAKDRENY 2jLCBJcE6Wi1iJUamoec6xzI//JZWdcsjOYDIFE8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Selvin Xavier , Jason Gunthorpe , Sasha Levin Subject: [PATCH 4.19 073/142] RDMA/bnxt_re: Fix system hang when registration with L2 driver fails Date: Fri, 14 Dec 2018 12:59:18 +0100 Message-Id: <20181214115749.982029974@linuxfoundation.org> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20181214115747.053633987@linuxfoundation.org> References: <20181214115747.053633987@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 3c4b1419c33c2417836a63f8126834ee36968321 ] Driver doesn't release rtnl lock if registration with L2 driver (bnxt_re_register_netdev) fais and this causes hang while requesting for the next lock. [ 371.635416] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 371.635417] kworker/u48:1 D 0 634 2 0x80000000 [ 371.635423] Workqueue: bnxt_re bnxt_re_task [bnxt_re] [ 371.635424] Call Trace: [ 371.635426] ? __schedule+0x36b/0xbd0 [ 371.635429] schedule+0x39/0x90 [ 371.635430] schedule_preempt_disabled+0x11/0x20 [ 371.635431] __mutex_lock+0x45b/0x9c0 [ 371.635433] ? __mutex_lock+0x16d/0x9c0 [ 371.635435] ? bnxt_re_ib_reg+0x2b/0xb30 [bnxt_re] [ 371.635438] ? wake_up_klogd+0x37/0x40 [ 371.635442] bnxt_re_ib_reg+0x2b/0xb30 [bnxt_re] [ 371.635447] bnxt_re_task+0xfd/0x180 [bnxt_re] [ 371.635449] process_one_work+0x216/0x5b0 [ 371.635450] ? process_one_work+0x189/0x5b0 [ 371.635453] worker_thread+0x4e/0x3d0 [ 371.635455] kthread+0x10e/0x140 [ 371.635456] ? process_one_work+0x5b0/0x5b0 [ 371.635458] ? kthread_stop+0x220/0x220 [ 371.635460] ret_from_fork+0x3a/0x50 [ 371.635477] INFO: task NetworkManager:1228 blocked for more than 120 seconds. [ 371.635478] Tainted: G B OE 4.20.0-rc1+ #42 [ 371.635479] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Release the rtnl_lock correctly in the failure path. Fixes: de5c95d0f518 ("RDMA/bnxt_re: Fix system crash during RDMA resource initialization") Signed-off-by: Selvin Xavier Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/hw/bnxt_re/main.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/infiniband/hw/bnxt_re/main.c b/drivers/infiniband/hw/bnxt_re/main.c index 85cd1a3593d6..bb3f16273938 100644 --- a/drivers/infiniband/hw/bnxt_re/main.c +++ b/drivers/infiniband/hw/bnxt_re/main.c @@ -1252,6 +1252,7 @@ static int bnxt_re_ib_reg(struct bnxt_re_dev *rdev) /* Registered a new RoCE device instance to netdev */ rc = bnxt_re_register_netdev(rdev); if (rc) { + rtnl_unlock(); pr_err("Failed to register with netedev: %#x\n", rc); return -EINVAL; } -- 2.19.1