Description of problem:
xfs文件系统，xfstests ext4-overlay overlay/072 缺少/fs/vdb2/ovl-mnt/4
x86和arm均存在该问题,非regression，RC1版本亦存在此问题
an8成功

失败几率：必现

Version-Release number of selected component (if applicable):
# uname -r
4.19.91-26_rc3.an7.aarch64
# uname -r
4.19.91-26_rc3.an7.x86_64

# cat /etc/os-release
NAME="Anolis OS"
VERSION="7.7"
ID="anolis"
ID_LIKE="rhel fedora centos"
VERSION_ID="7.7"
PRETTY_NAME="Anolis OS 7.7"
ANSI_COLOR="0;31"
HOME_URL="https://openanolis.cn/"
BUG_REPORT_URL="https://bugs.openanolis.cn/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"



How reproducible:
1. 准备环境
#准备disk1 disk2测试盘，视本地环境修改
disk1=vdb1
disk2=vdb2

dmsetup remove_all
wipefs -a --force /dev/$disk1
wipefs -a --force /dev/$disk2

mkfs -t ext4 -q -F /dev/$disk1
mkfs -t ext4 -q -F /dev/$disk2

export TEST_DIR=/fs/$disk1
export TEST_DEV=/dev/$disk1
export FSTYP=ext4
export SCRATCH_MNT=/fs/scratch
mkdir /fs/$disk1 -p
mkdir /fs/scratch -p
export SCRATCH_DEV=/dev/$disk2

2. 下载xfstests测试代码

3. 编译测试源码
cd xfstests-dev
export CFLAGS="-fcommon"
make
make install


Actual results:
# ./check -overlay tests/overlay/072
FSTYP         -- overlay
PLATFORM      -- Linux/aarch64 iZ2zebfu2pfe96wy4xb5lsZ 4.19.91-26_rc3.an7.aarch64 #1 SMP Tue May 10 20:56:42 CST 2022
MKFS_OPTIONS  -- /fs/vdb2
MOUNT_OPTIONS -- /fs/vdb2 /fs/vdb2/ovl-mnt

overlay/072     _check_dmesg: something found in dmesg (see /tmp/tone/run/xfstests/results//overlay/072.dmesg)
- output mismatch (see /tmp/tone/run/xfstests/results//overlay/072.out.bad)
    --- tests/overlay/072.out   2022-05-11 18:45:58.261458397 +0800
    +++ /tmp/tone/run/xfstests/results//overlay/072.out.bad     2022-05-13 16:55:25.938313164 +0800
    @@ -1,3 +1,5 @@
     QA output created by 072
     2
    +ln: failed to create hard link '/fs/vdb2/ovl-mnt/4' => '/fs/vdb2/ovl-mnt/0': No such file or directory
    +rm: cannot remove '/fs/vdb2/ovl-mnt/4': No such file or directory
     Silence is golden
    ...
    (Run 'diff -u /tmp/tone/run/xfstests/tests/overlay/072.out /tmp/tone/run/xfstests/results//overlay/072.out.bad'  to see the entire diff)
Ran: overlay/072
Failures: overlay/072
Failed 1 of 1 tests


Expected results:

Additional info:
xfsprogs-4.5.0-22.an7
xfsprogs-4.19.0-5.0.1.an7
均失败
x86和arm均存在该问题,非regression，RC1版本亦存在此问题
an8成功