OrangePi Zero3 Ubuntu客户端NFS挂载失败问题求助

各位大佬好，我遇到了一个NFS挂载的棘手问题，想请大家帮忙分析下：

我有一台NFS服务器，export.conf配置是有效的，同网段里4台客户端中有3台都能正常连接服务器并读写共享目录，但第四台OrangePi Zero3却始终挂载失败。

第一次挂载尝试（默认NFSv4.2） #

执行挂载命令后直接报协议错误：

machs@orangepizero3:~$ sudo mount -t nfs  192.168.0.131:/media/smilingBuddha /media/smilingBuddha -vvv

mount.nfs: timeout set for Wed Nov 15 13:35:23 2023
mount.nfs: trying text-based options 'vers=4.2,addr=192.168.0.131,clientaddr=192.168.0.246'
mount.nfs: mount(2): Protocol error
mount.nfs: Protocol error

指定NFSv3版本尝试 #

我试过指定NFSv3版本挂载，结果超时后报输入输出错误：

machs@orangepizero3:~$ sudo mount -t nfs -o mountvers=3 electricsheep:/media/smilingBuddha /media/smilingBuddha -vvv

mount.nfs: timeout set for Wed Nov 15 13:43:12 2023
mount.nfs: trying text-based options 'mountvers=3,addr=192.168.0.131'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.0.131 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.0.131 prog 100005 vers 3 prot UDP port 50411
mount.nfs: mount(2): Input/output error
mount.nfs: mount system call failed

奇怪的对比：能正常挂载老NAS的NFS共享 #

更让人困惑的是，这台OrangePi Zero3挂载另一台老NAS的NFS共享却完全没问题，甚至会自动降级到NFSv3成功挂载：

machs@orangepizero3:~$ sudo mount /media/pillarOfAutumn -vvv

mount.nfs: timeout set for Wed Nov 15 13:36:56 2023
mount.nfs: trying text-based options 'hard,intr,vers=4.2,addr=192.168.0.77,clientaddr=192.168.0.246'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'hard,intr,vers=4,minorversion=1,addr=192.168.0.77,clientaddr=192.168.0.246'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'hard,intr,vers=4,addr=192.168.0.77,clientaddr=192.168.0.246'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'hard,intr,addr=192.168.0.77'
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying 192.168.0.77 prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying 192.168.0.77 prog 100005 vers 3 prot UDP port 46905
# 最终挂载成功，可正常访问目录

我已经排查过的信息 #

• 客户端上能正常看到服务器的导出目录：

  machs@orangepizero3:~$ showmount -e electricsheep
  Export list for electricsheep:
  /media/smilingBuddha 192.168.0.0/24
  

• 客户端能探测到服务器的NFS服务：

  machs@orangepizero3:~$ rpcinfo -p electricsheep | grep nfs
  100003    3   tcp   2049  nfs
  100003    4   tcp   2049  nfs
  

• 客户端内核版本（因为6.x内核不支持板载WiFi，所以只能用这个旧版本）：

  machs@orangepizero3:~$ uname -a
  Linux orangepizero3 5.4.125 #1.0.0 SMP Fri Jun 30 11:59:12 CST 2023 aarch64 aarch64 aarch64 GNU/Linux
  

• NFS服务器信息：
  • 内核版本：

    machs@electricSheep:~$ uname -a
    Linux electricSheep 6.2.0-36-generic #37~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct  9 15:34:04 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
    

  • /etc/exports配置：

    machs@electricSheep:~$ cat /etc/exports
    /media/smilingBuddha  192.168.0.0/24(rw,sync,no_root_squash,no_subtree_check)
    

我已经谷歌了各种错误码，但还是没找到解决办法，希望各位大佬能给点思路，谢谢！

备注：内容来源于stack exchange，提问作者machs