#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2013 Red Hat, Inc.  All Rights Reserved.
#
# FS QA Test No. 305
#
# Regression test for commit:
# 9559996 ext4: remove mb_groups before tearing down the buddy_cache
#
. ./common/preamble
_begin_fstest auto

PIDS=""

# Override the default cleanup function.
_cleanup()
{
    cd /
    kill $PIDS >/dev/null 2>&1
}

# Import common functions.
. ./common/filter

# real QA test starts here
_supported_fs ext4

_require_scratch

echo "Silence is golden"

DEV_BASENAME=$(_short_dev $SCRATCH_DEV)
echo "Start test on device $SCRATCH_DEV, basename $DEV_BASENAME" >$seqres.full
_scratch_mkfs >>$seqres.full 2>&1

while true; do
	cat /proc/fs/ext4/$DEV_BASENAME/mb_groups > /dev/null 2>&1
done &
PIDS=$!

# 30 loops is enough to crash a buggy kernel
i=0
while [ $i -lt 30 ]; do
	_try_scratch_mount
	_scratch_unmount
	let i=i+1
done

# no BUG_ON, all done
kill $PIDS >/dev/null 2>&1
wait
status=0
exit