From patchwork Wed Sep 27 16:35:51 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liu Bo X-Patchwork-Id: 9974489 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E425560365 for ; Wed, 27 Sep 2017 17:40:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D189C27F9F for ; Wed, 27 Sep 2017 17:40:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C625B28607; Wed, 27 Sep 2017 17:40:12 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9665C28592 for ; Wed, 27 Sep 2017 17:40:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751555AbdI0RjO (ORCPT ); Wed, 27 Sep 2017 13:39:14 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:43159 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751408AbdI0RjN (ORCPT ); Wed, 27 Sep 2017 13:39:13 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v8RHdCX0015895 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 Sep 2017 17:39:12 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id v8RHdCOO015324 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 Sep 2017 17:39:12 GMT Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id v8RHdCS4011890; Wed, 27 Sep 2017 17:39:12 GMT Received: from dhcp-10-211-47-181.usdhcp.oraclecorp.com.com (/10.211.47.181) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 27 Sep 2017 10:39:11 -0700 From: Liu Bo To: fstests@vger.kernel.org Cc: linux-btrfs@vger.kernel.org Subject: [PATCH v3] fstests: btrfs/150 regression test for reading compressed data Date: Wed, 27 Sep 2017 10:35:51 -0600 Message-Id: <20170927163551.17188-1-bo.li.liu@oracle.com> X-Mailer: git-send-email 2.9.4 In-Reply-To: <20170920235243.11822-1-bo.li.liu@oracle.com> References: <20170920235243.11822-1-bo.li.liu@oracle.com> X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We had a bug in btrfs compression code which could end up with a kernel panic. This is adding a regression test for the bug and I've also sent a kernel patch to fix the bug. The patch is "Btrfs: fix kernel oops while reading compressed data". Signed-off-by: Liu Bo --- v3: - Enable task-filter in debugfs v2: - Fix ambiguous copyright. - Use /proc/$pid/make-it-fail to specify IO failure - Use bash -c to run test only when pid is odd. - Add test to dangerous group. tests/btrfs/150 | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/150.out | 3 ++ tests/btrfs/group | 1 + 3 files changed, 109 insertions(+) create mode 100755 tests/btrfs/150 create mode 100644 tests/btrfs/150.out diff --git a/tests/btrfs/150 b/tests/btrfs/150 new file mode 100755 index 0000000..97041b6 --- /dev/null +++ b/tests/btrfs/150 @@ -0,0 +1,105 @@ +#! /bin/bash +# FS QA Test btrfs/150 +# +# This is a regression test which ends up with a kernel oops in btrfs. +# It occurs when btrfs's read repair happens while reading a compressed +# extent. +# The patch to fix it is +# Btrfs: fix kernel oops while reading compressed data +# +#----------------------------------------------------------------------- +# Copyright (c) 2017 Oracle. All Rights Reserved. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it would be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write the Free Software Foundation, +# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +#----------------------------------------------------------------------- +# + +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" + +here=`pwd` +tmp=/tmp/$$ +status=1 # failure is the default! +trap "_cleanup; exit \$status" 0 1 2 3 15 + +_cleanup() +{ + cd / + rm -f $tmp.* +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# remove previous $seqres.full before test +rm -f $seqres.full + +# real QA test starts here + +# Modify as appropriate. +_supported_fs btrfs +_supported_os Linux +_require_scratch +_require_fail_make_request +_require_scratch_dev_pool 2 + +SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV` +enable_io_failure() +{ + echo 100 > $DEBUGFS_MNT/fail_make_request/probability + echo 1000 > $DEBUGFS_MNT/fail_make_request/times + echo 0 > $DEBUGFS_MNT/fail_make_request/verbose + echo 1 > $DEBUGFS_MNT/fail_make_request/task-filter + echo 1 > $SYSFS_BDEV/make-it-fail +} + +disable_io_failure() +{ + echo 0 > $DEBUGFS_MNT/fail_make_request/probability + echo 0 > $DEBUGFS_MNT/fail_make_request/times + echo 0 > $DEBUGFS_MNT/fail_make_request/task-filter + echo 0 > $SYSFS_BDEV/make-it-fail +} + +_scratch_pool_mkfs "-d raid1 -b 1G" >> $seqres.full 2>&1 + +# It doesn't matter which compression algorithm we use. +_scratch_mount -ocompress + +# Create a file with all data being compressed +$XFS_IO_PROG -f -c "pwrite -W 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io + +# Raid1 consists of two copies and btrfs decides which copy to read by reader's +# %pid. Now we inject errors to copy #1 and copy #0 is good. We want to read +# the bad copy to trigger read-repair. +while [[ -z $result ]]; do + # invalidate the page cache + $XFS_IO_PROG -f -c "fadvise -d 0 8K" $SCRATCH_MNT/foobar + + enable_io_failure + + result=$(bash -c " + if [ \$((\$\$ % 2)) == 1 ]; then + echo 1 > /proc/\$\$/make-it-fail + exec $XFS_IO_PROG -c \"pread 0 8K\" \$SCRATCH_MNT/foobar + fi") + + disable_io_failure +done + +# success, all done +status=0 +exit diff --git a/tests/btrfs/150.out b/tests/btrfs/150.out new file mode 100644 index 0000000..c492c24 --- /dev/null +++ b/tests/btrfs/150.out @@ -0,0 +1,3 @@ +QA output created by 150 +wrote 8192/8192 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) diff --git a/tests/btrfs/group b/tests/btrfs/group index 70c3f05..e73bb1b 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -152,3 +152,4 @@ 147 auto quick send 148 auto quick rw 149 auto quick send compress +150 auto quick dangerous