Description of problem:
xfs文件系统，xfstests下generic/536 File grew from 4096 B to 8192 B when writing to the fallocated range
x86和arm均存在该问题

失败几率：50% 有时候连续几次失败，有时候连续几次成功
测试日志：
# ./check tests/generic/568
FSTYP         -- xfs (non-debug)
PLATFORM      -- Linux/x86_64 iZ2ze6n8cezigzjqlcfjadZ 4.19.91-26_rc1.an7.x86_64 #1 SMP Mon Apr 25 17:24:24 CST 2022
MKFS_OPTIONS  -- -f -bsize=4096 /dev/vdb2
MOUNT_OPTIONS -- /dev/vdb2 /fs/scratch

generic/568 0s ... - output mismatch (see /tmp/tone/run/xfstests/results//generic/568.out.bad)
    --- tests/generic/568.out   2022-04-27 21:06:24.108728363 +0800
    +++ /tmp/tone/run/xfstests/results//generic/568.out.bad     2022-05-05 16:04:55.107262457 +0800
    @@ -1,4 +1,4 @@
     QA output created by 568
     wrote 2/2 bytes at offset block_size - 1
     XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
    -OK: File did not grow.
    +ERROR: File grew from 4096 B to 8192 B when writing to the fallocated range.
    ...
    (Run 'diff -u /tmp/tone/run/xfstests/tests/generic/568.out /tmp/tone/run/xfstests/results//generic/568.out.bad'  to see the entire diff)
Ran: generic/568
Failures: generic/568
Failed 1 of 1 tests

Version-Release number of selected component (if applicable):
# uname -a
Linux iZ2ze6n8cezigzjqlcfjadZ 4.19.91-26_rc1.an7.x86_64 #1 SMP Mon Apr 25 17:24:24 CST 2022 x86_64 x86_64 x86_64 GNU/Linux
# uname -a
Linux iZ2zebfu2pfe96wy4xb5lsZ 4.19.91-26_rc1.an7.aarch64 #1 SMP Mon Apr 25 17:30:58 CST 2022 aarch64 aarch64 aarch64 GNU/Linux
# 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
disk1=vdb1
disk2=vdb2

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

mkfs -t xfs -L OStest -q -f /dev/$disk1
mkfs -t xfs -L OStest -q -f /dev/$disk2

export TEST_DIR=/fs/$disk1
export TEST_DEV=/dev/$disk1
export FSTYP=xfs
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

4.执行测试用例
./check tests/generic/568


Actual results:


Expected results:


Additional info:
xfsprogs-4.5.0-22.an7.x86_64