From patchwork Mon Apr 15 08:31:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Filipe Manana X-Patchwork-Id: 10900301 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3BF7814DB for ; Mon, 15 Apr 2019 08:31:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2302F288BE for ; Mon, 15 Apr 2019 08:31:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 176B0288DA; Mon, 15 Apr 2019 08:31:34 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham 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 5587C288BE for ; Mon, 15 Apr 2019 08:31:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726817AbfDOIbb (ORCPT ); Mon, 15 Apr 2019 04:31:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:56300 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725779AbfDOIbb (ORCPT ); Mon, 15 Apr 2019 04:31:31 -0400 Received: from localhost.localdomain (bl8-197-74.dsl.telepac.pt [85.241.197.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 66B7120651; Mon, 15 Apr 2019 08:31:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555317090; bh=j9x5ykCVDRuLFTLQis2LKKcGdwb2lpggxQXG0rEM3pI=; h=From:To:Cc:Subject:Date:From; b=Hj3QJrtqVouPnwev/1Fn/9tHbOcNpC+65AECRSsyjxDxXU2uszot1fMdkExp6ayZN XJfqKH3+JPQa2gYM3f2q0S117IfYKuv/JlkM0T75LgL9s4fs1qpxBy3BOkgg5IBlvx eeI/9eQr8wdfXP0efq+e9juCe1uA42ALtxOdvl6I= From: fdmanana@kernel.org To: fstests@vger.kernel.org Cc: linux-btrfs@vger.kernel.org, Filipe Manana Subject: [PATCH] btrfs: test send with deduplication running concurrently Date: Mon, 15 Apr 2019 09:31:21 +0100 Message-Id: <20190415083121.2338-1-fdmanana@kernel.org> X-Mailer: git-send-email 2.11.0 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 From: Filipe Manana Stress send running in parallel with deduplication against files that belong to the snapshots used by send. The goal is to hit assertion failures and BUG_ONs when send is running, or send finding an inconsistent snapshot that leads to a failure (reported in dmesg/syslog) and results in an EIO error returned to user space. The test needs big trees (snapshots) with large differences between the parent and send snapshots in order to hit such issues with a good probability. This currently fails in btrfs, and there is a patch for the linux kernel that fixes it and is titled: "Btrfs: fix race between send and deduplication that lead to failures and crashes" Signed-off-by: Filipe Manana --- tests/btrfs/186 | 247 ++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/186.out | 3 + tests/btrfs/group | 1 + 3 files changed, 251 insertions(+) create mode 100755 tests/btrfs/186 create mode 100644 tests/btrfs/186.out diff --git a/tests/btrfs/186 b/tests/btrfs/186 new file mode 100755 index 00000000..ca1a5638 --- /dev/null +++ b/tests/btrfs/186 @@ -0,0 +1,247 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2019 SUSE Linux Products GmbH. All Rights Reserved. +# +# FSQA Test No. 186 +# +# Stress send running in parallel with deduplication against files that belong +# to the snapshots used by send. The goal is to hit assertion failures and +# BUG_ONs when send is running, or send finding an inconsistent snapshot that +# leads to a failure (reported in dmesg/syslog) and results in an EIO error +# returned to user space. The test needs big trees (snapshots) with large +# differences between the parent and send snapshots in order to hit such issues +# with a good probability. +# +seq=`basename $0` +seqres=$RESULT_DIR/$seq +echo "QA output created by $seq" +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/attr +. ./common/filter +. ./common/reflink + +# real QA test starts here +_supported_fs btrfs +_supported_os Linux +_require_scratch_dedupe +_require_attrs + +rm -f $seqres.full + +_scratch_mkfs >>$seqres.full 2>&1 +_scratch_mount + +test_log_dir=$TEST_DIR/btrfs-test-$seq + +rm -fr $test_log_dir +mkdir $test_log_dir + +dedupe_two_files() +{ + trap "wait; exit" SIGTERM + + local log_file=$1 + local f1=$(find $SCRATCH_MNT/snap1 -type f | shuf -n 1) + local f2=$(find $SCRATCH_MNT/snap2 -type f | shuf -n 1) + + if (( RANDOM % 2 )); then + local tmp=$f1 + f1=$f2 + f2=$tmp + fi + + $XFS_IO_PROG -r -c "dedupe $f1 0 0 64K" $f2 >/dev/null 2>>$log_file +} + +dedupe_files_loop() +{ + trap "wait; exit" SIGTERM + + while true; do + for ((i = 1; i <= 10; i++)); do + dedupe_two_files "${test_log_dir}/dedup_${i}.log" & + done + wait + done +} + +full_send_loop() +{ + trap "wait; exit" SIGTERM + + local count=$1 + + for ((i = 1; i <= $count; i++)); do + local send_stream_file=$send_files_dir/full_$i.send + + # The send command may run successfully or it might return an + # error. If the error happens due to the kernel ioctl returning + # -EAGAIN, it's because a concurrent deduplication is ongoing + # against the same root (snapshot) send tried to work on. + # We will check later (in dmesg/syslog) for errors other then + # the expected one due to concurrent deduplication and for + # any reported error from send other than EAGAIN. + $BTRFS_UTIL_PROG send --no-data -f /dev/null $SCRATCH_MNT/snap1 \ + >/dev/null 2>>$test_log_dir/full_send.log + done +} + +inc_send_loop() +{ + trap "wait; exit" SIGTERM + + local count=$1 + + for ((i = 1; i <= $count; i++)); do + # The send command may run successfully or it might return an + # error. If the error happens due to the kernel ioctl returning + # -EAGAIN, it's because a concurrent deduplication is ongoing + # against the same root (snapshot) send tried to work on. + # We will check later (in dmesg/syslog) for errors other then + # the expected one due to concurrent deduplication and for + # any reported error from send other than EAGAIN. + $BTRFS_UTIL_PROG send --no-data -f /dev/null \ + -p $SCRATCH_MNT/snap1 $SCRATCH_MNT/snap2 >/dev/null \ + 2>>$test_log_dir/inc_send.log + done +} + +# Number of files created before first snapshot. Must be divisable by 4. +nr_initial_files=50000 +# Number of files created after the first snapshot. Must be divisable by 4. +nr_more_files=50000 + +# Create initial files. +step=$((nr_initial_files / 4)) +for ((n = 0; n < 4; n++)); do + offset=$((step * $n)) + ( + for ((i = 1; i <= step; i++)); do + $XFS_IO_PROG -f -c "pwrite -S 0xea 0 64K" \ + $SCRATCH_MNT/file_$((i + offset)) >/dev/null + done + ) & + create_pids[$n]=$! +done +wait ${create_pids[@]} + +$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap1 \ + | _filter_scratch + +# Add some more files, so that that are substantial differences between the +# two test snapshots used for an incremental send later. + +# Create more files. +step=$((nr_more_files / 4)) +for ((n = 0; n < 4; n++)); do + offset=$((nr_initial_files + step * $n)) + ( + for ((i = 1; i <= step; i++)); do + $XFS_IO_PROG -f -c "pwrite -S 0xea 0 64K" \ + $SCRATCH_MNT/file_$((i + offset)) >/dev/null + done + ) & + create_pids[$n]=$! +done +wait ${create_pids[@]} + +# Add some xattrs to all files, so that every leaf and node of the fs tree is +# COWed. Adding more files does only adds leafs and nodes to the tree's right +# side, since inode numbers are based on a counter and form the first part +# (objectid) of btree keys (we only modifying the right most leaf of the tree). +# Use large values for the xattrs to quickly increase the height of the tree. +xattr_value=$(printf '%0.sX' $(seq 1 3800)) + +# Split the work into 4 workers working on consecutive ranges to avoid contention +# on the same leafs as much as possible. +step=$(((nr_more_files + nr_initial_files) / 4)) +for ((n = 0; n < 4; n++)); do + offset=$((step * $n)) + ( + for ((i = 1; i <= step; i++)); do + $SETFATTR_PROG -n 'user.x1' -v $xattr_value \ + $SCRATCH_MNT/file_$((i + offset)) + done + ) & + setxattr_pids[$n]=$! +done +wait ${setxattr_pids[@]} + +$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT $SCRATCH_MNT/snap2 \ + | _filter_scratch + +full_send_loop 5 & +full_send_pid=$! + +inc_send_loop 10 & +inc_send_pid=$! + +dedupe_files_loop & +dedupe_pid=$! + +wait $full_send_pid +wait $inc_send_pid + +kill $dedupe_pid +wait $dedupe_pid + +# Check for errors messages that happen due to inconsistent snapshot caused by +# deduplication running in parallel with send, causing btree nodes/leafs to +# disappear and getting reused while send is using them. +# +# Example messages: +# +# BTRFS error (device sdc): did not find backref in send_root. inode=63292, \ +# offset=0, disk_byte=5228134400 found extent=5228134400 +# +# BTRFS error (device sdc): parent transid verify failed on 32243712 wanted 24 \ +# found 27 +# +_dmesg_since_test_start | egrep -e '\bBTRFS error \(device [A-Za-z0-9]*?\): ' + +# Check for errors the send ioctl returned. Only EAGAIN errors are expected, +# every other error is unexpected and must make the test fail. + +echo "Errors from full send operations:" >>$seqres.full +egrep -v -e "At subvol $SCRATCH_MNT/snap1" \ + -e "ERROR: send ioctl failed with -11: Resource temporarily unavailable" \ + $test_log_dir/full_send.log >>$seqres.full +if [ $? -eq 0 ]; then + echo "Unexpected errors from full send operations, check $seqres.full" +else + echo "none" >>$seqres.full +fi + +echo "Errors from incremental send operations:" >>$seqres.full +egrep -v -e "At subvol $SCRATCH_MNT/snap2" \ + -e "ERROR: send ioctl failed with -11: Resource temporarily unavailable" \ + $test_log_dir/inc_send.log >>$seqres.full +if [ $? -eq 0 ]; then + echo "Unexpected errors from incremental send operations, check $seqres.full" +else + echo "none" >>$seqres.full +fi + +# Check for errors from deduplication. Only EAGIN errors are expected. +echo "Errors from deduplication operations:" >>$seqres.full +egrep -v -e "XFS_IOC_FILE_EXTENT_SAME: Resource temporarily unavailable" \ + ${test_log_dir}/dedup_*.log >>$seqres.full +if [ $? -eq 0 ]; then + echo "Unexpected errors from deduplication operations, check $seqres.full" +else + echo "none" >>$seqres.full +fi + +status=0 +exit diff --git a/tests/btrfs/186.out b/tests/btrfs/186.out new file mode 100644 index 00000000..42bcc0e6 --- /dev/null +++ b/tests/btrfs/186.out @@ -0,0 +1,3 @@ +QA output created by 186 +Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/snap1' +Create a readonly snapshot of 'SCRATCH_MNT' in 'SCRATCH_MNT/snap2' diff --git a/tests/btrfs/group b/tests/btrfs/group index 6b81ecce..8bfda602 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -188,3 +188,4 @@ 183 auto quick clone compress punch 184 auto quick volume 185 auto quick send volume +186 auto send dedupe clone