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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2015 Red Hat Inc. All Rights Reserved.
#
# FS QA Test No. 085
#
# Exercise fs freeze/unfreeze and mount/umount race, which could lead to
# use-after-free oops.
#
# This commit fixed the issue:
# 1494583 fix get_active_super()/umount() race
#
. ./common/preamble
_begin_fstest auto freeze mount
# Override the default cleanup function.
_cleanup()
{
cd /
rm -f $tmp.*
cleanup_dmdev
}
cleanup_dmdev()
{
# in case it's still suspended and/or mounted
$DMSETUP_PROG resume $lvdev >/dev/null 2>&1
[ -n "$pid" ] && kill -9 $pid 2>/dev/null
wait $pid
$UMOUNT_PROG $lvdev >/dev/null 2>&1
_dmsetup_remove $node
}
# Import common functions.
. ./common/filter
# real QA test starts here
_supported_fs generic
_require_scratch
_require_block_device $SCRATCH_DEV
_require_dm_target linear
_require_freeze
setup_dmdev()
{
table="0 $size_in_sector linear $SCRATCH_DEV 0"
_dmsetup_create $node --table "$table" || \
_fail "setup dm device failed"
}
echo "Silence is golden"
size=$((256 * 1024 * 1024))
size_in_sector=$((size / 512))
_scratch_mkfs_sized $size >>$seqres.full 2>&1
node=$seq-test
lvdev=/dev/mapper/$node
setup_dmdev
# take use of dmsetup suspend to freeze the fs.
# xfs_freeze/fsfreeze cannot be used in this test, because it can possibly
# freeze the root fs of the host when SCRATCH_MNT is not mounted
#
# And the results of the racing commands (suspend/resume, mount/umount) are not
# important, as long as they're racing with each other. So just throw away the
# outputs and ignore the results.
for ((i=0; i<100; i++)); do
$DMSETUP_PROG suspend $lvdev >/dev/null 2>&1
$DMSETUP_PROG resume $lvdev >/dev/null 2>&1
done &
pid=$!
for ((i=0; i<100; i++)); do
$MOUNT_PROG $lvdev $SCRATCH_MNT >/dev/null 2>&1
$UMOUNT_PROG $lvdev >/dev/null 2>&1
done &
pid="$pid $!"
wait $pid
unset pid
status=0
exit
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