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=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=no 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 05595C33CB2 for ; Fri, 31 Jan 2020 03:24:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C20EB2082E for ; Fri, 31 Jan 2020 03:24:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="DYc5XR+a" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727824AbgAaDY3 (ORCPT ); Thu, 30 Jan 2020 22:24:29 -0500 Received: from userp2130.oracle.com ([156.151.31.86]:59220 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727827AbgAaDY3 (ORCPT ); Thu, 30 Jan 2020 22:24:29 -0500 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id 00V3NeZN134325; Fri, 31 Jan 2020 03:24:26 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id; s=corp-2019-08-05; bh=e9udwEvAI2f1erE+tmYWEs722/8u1w85VhRstQ7aDXc=; b=DYc5XR+aSy6gvSPdhrQzc7pdmKyWFBoppkm1pGTthnICeDmzINIupCxW1n6/s1MSpjvr LffyRaGxLKate6tD59AS76jIXqeeCCxAArfKFMUEMvZRP7Son+dWqMFfm5qBtFPxJQ2c paEEGxbbWpMrCzoU7iTOeUbla0s56AiApqx2AfvwHHmVrUIVj5aQpbzDFu5YTfKDnAs2 NUouMo8m/WoakxxVGciApWahYVo+6CiwzD5vZCT+OVML8DKg06yA4P5MNS3UNhyPVbik I9dVBzSoOGed6ASEHOtgoBVWBB4Z8PYIao0kBVhqjSKTQCoxdjMkopVYblW5xFfmMjp3 sg== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 2xrd3uqvy3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 31 Jan 2020 03:24:26 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id 00V3OIA5155488; Fri, 31 Jan 2020 03:24:26 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 2xv9bvmbbe-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 31 Jan 2020 03:24:25 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 00V3NuBq026203; Fri, 31 Jan 2020 03:23:56 GMT Received: from ca-ldom147.us.oracle.com (/10.129.68.131) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 30 Jan 2020 19:23:55 -0800 From: Bijan Mottahedeh To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, io-uring@vger.kernel.org Subject: [PATCH 0/1] block: Manage bio references so the bio persists until necessary Date: Thu, 30 Jan 2020 19:23:41 -0800 Message-Id: <1580441022-59129-1-git-send-email-bijan.mottahedeh@oracle.com> X-Mailer: git-send-email 1.8.3.1 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9516 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=3 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=827 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001310028 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9516 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=3 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=900 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1911140001 definitions=main-2001310028 Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This patch addresses a bio reference count problem encountered while debugging a different, use-after-free bug with the fio test below. The original use-after-free bug is still hit however. [global] filename=/dev/nvme0n1 rw=randread bs=4k direct=1 time_based=1 randrepeat=1 gtod_reduce=1 [fiotest] fio nvme.fio --readonly --ioengine=io_uring --iodepth 1024 --fixedbufs --hipri --numjobs=$1 --runtime=$2 Bijan Mottahedeh (1): block: Manage bio references so the bio persists until necessary fs/block_dev.c | 78 ++++++++++++++++++++++++++++++---------------------------- 1 file changed, 40 insertions(+), 38 deletions(-) -- 1.8.3.1