On Thu, 16 Jan 2020, Krzysztof Kozlowski wrote: > Hi all, > > Bisect pointed to 6d972518b821 ("NFS: Add fs_context support.") for > failures of mounting NFS v4 root on my boards: > mount.nfs4 -o vers=4,nolock 192.168.1.10:/srv/nfs/odroidhc1 /new_root > [ 24.980839] NFS4: Couldn't follow remote path > [ 24.986201] NFS: Value for 'minorversion' out of range > mount.nfs4: Numerical result out of range > > https://krzk.eu/#/builders/21/builds/1692 > Full console log: > https://krzk.eu/#/builders/21/builds/1692/steps/14/logs/serial0 > > Enabling NFS v4.1 in defconfig seems to help. I can send patches for > this (for defconfigs) but probably the root cause should be fixed as > well. > > Environment: > 1. Arch ARM Linux > 2. exynos_defconfig > 3. Exynos boards (Odroid XU3, etc), ARMv7, octa-core (Cortex-A7+A15), > Exynos5422 SoC > 4. systemd, boot up with static IP set in kernel command line > 5. No swap > 6. Kernel, DTB and initramfs are downloaded with TFTP > 7. NFS root from NFSv4 server > > Let me know if you need more details. I haven't had much luck reproducing this. I disabled v4.1 in my .config and I can still boot a VM with NFS root (granted, I don't really use NFS root so this setup is brand new and pretty basic): [root@localhost ~]# cat /proc/cmdline BOOT_IMAGE=mountapi/vmlinuz initrd=mountapi/initrd.img ip=dhcp selinux=0 console=tty0 console=ttyS0,115200 root=nfs4:192.168.122.3:/export/nfsroot/fedora31 [root@localhost ~]# grep nfs /proc/mounts 192.168.122.3:/export/nfsroot/fedora31 / nfs rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.122.69,local_lock=none,addr=192.168.122.3 0 0 Just out of curiousity, what version of the mount.nfs program do you have in your initramfs? I'm wondering if it's maybe passing the mount options differently than mine. FWIW I'm using version 2.4.2: [smayhew@aion tmp]$ lsinitrd /var/lib/tftpboot/mountapi/initrd.img|grep mount.nfs -rwsr-xr-x 1 root root 208600 Feb 14 2019 usr/sbin/mount.nfs lrwxrwxrwx 1 root root 9 Feb 14 2019 usr/sbin/mount.nfs4 -> mount.nfs [smayhew@aion tmp]$ /usr/lib/dracut/skipcpio /var/lib/tftpboot/mountapi/initrd.img|zcat|cpio -id usr/sbin/mount.nfs 256163 blocks [smayhew@aion tmp]$ ./usr/sbin/mount.nfs -V mount.nfs: (linux nfs-utils 2.4.2) [smayhew@aion tmp]$ -Scott > > Best regards, > Krzysztof >