From patchwork Tue May 19 02:13:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 11556777 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2534D913 for ; Tue, 19 May 2020 02:13:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0A74B207D4 for ; Tue, 19 May 2020 02:13:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727823AbgESCNh (ORCPT ); Mon, 18 May 2020 22:13:37 -0400 Received: from mx2.suse.de ([195.135.220.15]:35818 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726302AbgESCNh (ORCPT ); Mon, 18 May 2020 22:13:37 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 4053DADC2; Tue, 19 May 2020 02:13:38 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org, fstests@vger.kernel.org Subject: [PATCH] btrfs: Add a test for leaking root crash at unmount time Date: Tue, 19 May 2020 10:13:31 +0800 Message-Id: <20200519021331.14028-1-wqu@suse.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Test if canceled balance could lead to root leakage. If the kernel has CONFIG_BTRFS_DEBUG compiled, unmount time root leakge check would detect it, and cause NULL pointer dereference as the pages of the leaked root is already freed. The fix is titled "btrfs: relocation: Fix reloc root leakage and the NULL pointer reference caused by the leakage". Signed-off-by: Qu Wenruo Reviewed-by: Filipe Manana --- tests/btrfs/212 | 85 +++++++++++++++++++++++++++++++++++++++++++++ tests/btrfs/212.out | 2 ++ tests/btrfs/group | 1 + 3 files changed, 88 insertions(+) create mode 100755 tests/btrfs/212 create mode 100644 tests/btrfs/212.out diff --git a/tests/btrfs/212 b/tests/btrfs/212 new file mode 100755 index 00000000..4f4e177b --- /dev/null +++ b/tests/btrfs/212 @@ -0,0 +1,85 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved. +# +# FS QA Test 212 +# +# Test if unmounting a fs with balance canceled can lead to crash. +# This needs CONFIG_BTRFS_DEBUG compiled, which includes extra unmount time self-test +# +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.* + kill $balance_pid &> /dev/null + kill $cancel_pid &> /dev/null + "$KILLALL_PROG" -q $FSSTRESS_PROG &> /dev/null + $BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null + wait +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter + +# remove previous $seqres.full before test +rm -f $seqres.full + +# real QA test starts here + +# Modify as appropriate. +_supported_fs btrfs +_supported_os Linux +_require_scratch +_require_command "$KILLALL_PROG" killall + +_scratch_mkfs >> $seqres.full +_scratch_mount + +runtime=15 + +balance_workload() +{ + trap "wait; exit" SIGTERM + while true; do + $BTRFS_UTIL_PROG balance start -f --full $SCRATCH_MNT &> /dev/null + done +} + +cancel_workload() +{ + trap "wait; exit" SIGTERM + while true; do + $BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null + sleep 2 + done +} + +$FSSTRESS_PROG -d $SCRATCH_MNT -w -n 100000 >> $seqres.full 2>/dev/null & +balance_workload & +balance_pid=$! + +cancel_workload & +cancel_pid=$! + +sleep $runtime + +kill $balance_pid +kill $cancel_pid +"$KILLALL_PROG" -q $FSSTRESS_PROG &> /dev/null +$BTRFS_UTIL_PROG balance cancel $SCRATCH_MNT &> /dev/null +wait + +echo "Silence is golden" +# success, all done +status=0 +exit diff --git a/tests/btrfs/212.out b/tests/btrfs/212.out new file mode 100644 index 00000000..32d11390 --- /dev/null +++ b/tests/btrfs/212.out @@ -0,0 +1,2 @@ +QA output created by 212 +Silence is golden diff --git a/tests/btrfs/group b/tests/btrfs/group index 66b1beac..8d65bddd 100644 --- a/tests/btrfs/group +++ b/tests/btrfs/group @@ -214,3 +214,4 @@ 209 auto quick log 210 auto quick qgroup snapshot 211 auto quick log prealloc +212 auto balance dangerous