nfs ipv6 功能异常，dd挂死

**  nfs ipv6 功能异常，dd挂死   **

**【环境信息】**
```bash
]# cat /etc/openEuler-latest
openeulerversion=openEuler-24.03-LTS
compiletime=2024-04-14-13-30-15
gccversion=12.3.1-22.oe2403
kernelversion=6.6.0-19.0.0.20.oe2403
openjdkversion=1.8.0.402.b06-2.oe2403
[root@openEuler testEL_eu-elfcompress_t]# uname -a
Linux localhost.localdomain 6.6.0-19.0.0.20.oe2403.aarch64 #1 SMP Mon Apr 15 17:15:37 CST 2024 aarch64 aarch64 aarch64 GNU/Linux

```

**【问题复现步骤】**，请描述具体的操作步骤
testEL_nfsipv6_SCEN.012

1.nfs server端创建共享目录/nfs mkdir -p /nfs
2.nfs client端创建挂载目录/client mkdir -p /client
3.测试挂载成功后修改exports文件
3.1 nfs server端设置共享规则
  echo ""/nfs 客户端ipv6(rw,anonuid=0,anongid=0,all_squash)"" > /etc/exports
  exportfs -avr
3.2 nfs client端挂载,挂载完成后进行写操作
  mount nfs的ipv6:/nfs client
  echo \""${CASE_NAME}\"" > /client/test_01 预期结果1
3.3 nfs server端清空/etc/exports
  echo > /etc/exports
  exportfs -avr
3.4 nfs client端查看挂载目录、写操作
  ls -al /client
  echo \""${CASE_NAME}\"" >> /client/test_01 预期结果2
3.5 nfs server端还原/etc/exports
  echo ""/nfs ipv6(rw,anonuid=0,anongid=0,all_squash)"" > /etc/exports
  exportfs -avr
3.6 nfs client端删除写入文件，解除挂载
  rm -rf  /client/*
  umount /client
3.7还原/etc/exports至用例执行前状态
  mv /etc/exports.bak /etc/exports
  exportfs -avr
4.大文件读写时删除对应exports项
4.1 nfs server端设置共享规则
  echo ""/nfs *(rw,root_squash,all_squash,anonuid=0,anongid=0,sec=sys,sync,wdelay)"" > /etc/exports
  exportfs -avr
4.2 nfs client端
   mount 服务端ipv6:/nfs client
   echo ""${case_name}"" > ${client_dir}/test_04
  nfs client端dd 500M 文件操作
  dd if=/dev/zero of=/client/${case_name}_04_01.io count=1 ibs=500M &
  dd_pid_04_01=$(echo $!)
  nfs server端增加一条正确共享记录
  echo ""nfs1 *(rw,root_squash,all_squash,anonuid=0,anongid=0,sec=sys,sync,wdelay)"" >> /etc/exports
  exportfs -avr
  wait ${dd_pid_04_01}预期结果3
  nfs client端dd 500M 文件操作
  dd if=/dev/zero of=/client/${case_name}_04_02.io count=1 ibs=500M &
  dd_pid_04_02=$(echo $!)
  nfs server端增加一条不正确的共享记录
  echo ""/nfs2 *(rw,root_squash,all_squash,anonuid=0,anongid=0,sec=sys,sync,wdelay)"" >> /etc/exports
  wait ${dd_pid_04_02}预期结果4
**【实际结果】**，请描述出问题的结果和影响

```
+ mount -o sec=sys '[fe80::5054:ff:fed2:dd76%enp3s0]:/nfs_testEL_nfsipv6_SCEN.012' /client_testEL_nfsipv6_SCEN.012
+ '[' 0 -ne 0 ']'
+ echo testEL_nfsipv6_SCEN.012
+ dd if=/dev/zero of=/client_testEL_nfsipv6_SCEN.012/testEL_nfsipv6_SCEN.012_02.io count=1 ibs=1G
++ echo 28495
+ dd_pid_02=28495
+ sleep 1
+ ETS_SSHCMD 'echo > /etc/exports
                    exportfs -avr' root 'Huawei12#$' 9.82.200.13
+ local 'cmd=echo > /etc/exports
                    exportfs -avr'
+ local user=root
+ local 'passwd=Huawei12#$'
+ local ip=9.82.200.13
+ local port=22
+ local ret
+ check_ping 9.82.200.13
+ local ip=9.82.200.13
+ local timeout=5
+ local cmd=ping
+ [[ 9.82.200.13 =~ : ]]
+ ping 9.82.200.13 -c 1
PING 9.82.200.13 (9.82.200.13) 56(84) bytes of data.
64 bytes from 9.82.200.13: icmp_seq=1 ttl=64 time=0.244 ms

--- 9.82.200.13 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.244/0.244/0.244/0.000 ms
+ sh /opt/ETS/tools/sshcmd.sh -c 'echo > /etc/exports
                    exportfs -avr' -m 9.82.200.13 -u root -p 'Huawei12#$' -o 22
spawn ssh -o StrictHostKeyChecking=no -o ServerAliveInterval=30 -o ConnectTimeout=300 root@9.82.200.13 -p 22 source /etc/profile &>/dev/null;echo > /etc/exports
                    exportfs -avr
Warning: Permanently added '9.82.200.13' (ED25519) to the list of known hosts.

Authorized users only. All activities may be monitored and reported.
root@9.82.200.13's password:
exportfs: No file systems exported!
+ ret=0
+ '[' 0 -ne 0 ']'
+ return 0
+ wait 28495

```
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src-openEuler/nfs-utils

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