nfs mount failed with ipv6 addr

["Yan, Haixiao (CN)" <haixiao.yan.cn@windriver.com>]

On linux-5.10.y, my testcase run failed:

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# mount -t nfs [::1]:/mnt/nfs_root /mnt/v6 -o nfsvers=3
mount.nfs: requested NFS version or transport protocol is not supported

The first bad commit is:

commit 7229200f68662660bb4d55f19247eaf3c79a4217
Author: Chuck Lever <chuck.lever@oracle.com>
Date:   Mon Jun 3 10:35:02 2024 -0400

   nfsd: don't allow nfsd threads to be signalled.

   [ Upstream commit 3903902401451b1cd9d797a8c79769eb26ac7fe5 ]


Here is the test log:

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# dd if=/dev/zero of=/tmp/nfs.img bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.0386658 s, 2.7 GB/s
root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# mkfs /tmp/nfs.img
mke2fs 1.46.1 (9-Feb-2021)
Discarding device blocks:   1024/102400\b\b\b\b\b\b\b\b\b\b\b\b\b             \b\b\b\b\b\b\b\b\b\b\b\b\bdone
Creating filesystem with 102400 1k blocks and 25688 inodes
Filesystem UUID: 77e3bc56-46bb-4e5c-9619-d9a0c0999958
Superblock backups stored on blocks:
	8193, 24577, 40961, 57345, 73729

Allocating group tables:  0/13\b\b\b\b\b     \b\b\b\b\bdone
Writing inode tables:  0/13\b\b\b\b\b     \b\b\b\b\bdone
Writing superblocks and filesystem accounting information:  0/13\b\b\b\b\b     \b\b\b\b\bdone
root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# mount /tmp/nfs.img /mnt

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# mkdir /mnt/nfs_root

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# touch /etc/exports

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# echo '/mnt/nfs_root *(insecure,rw,async,no_root_squash)' >> /etc/exports

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# /opt/wr-test/bin/svcwp.sh nfsserver restart
stopping mountd: done
stopping nfsd: ..........failed
  using signal 9:
..........failed
exportfs: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/nfs_root".
   Assuming default behaviour ('no_subtree_check').
   NOTE: this default has changed since nfs-utils version 1.0.x

starting 8 nfsd kernel threads: done
starting mountd: done
exportfs: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "*:/mnt/nfs_root".
   Assuming default behaviour ('no_subtree_check').
   NOTE: this default has changed since nfs-utils version 1.0.x
root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# echo hello > /mnt/nfs_root/hello.txt

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# mkdir /mnt/v6

root@intel-x86-64:/opt/wr-test/testcases/userspace/nfs-utils_v6# mount -t nfs [::1]:/mnt/nfs_root /mnt/v6 -o nfsvers=3
mount.nfs: requested NFS version or transport protocol is not supported

Thanks,
Haixiao