Interesting stuff. Out of curiosity I just tried this myself, both client & server are virtual machines running Debian/stable (3.2.0-4-amd64) and I was able to reproduce this. A test case would be: ## server: $ apt-get install nfs-kernel-server jfsutils $ dd if=/dev/zero bs=1M count=256 > /var/test.img $ losetup -f /var/test.img $ mkfs.jfs /dev/loop0 $ mount -t jfs /dev/loop0 /mnt/disk $ tar -C / -cf - usr/share | tar -C /mnt/disk/ -xf - $ tail -1 /etc/exports /mnt/disk 192.168.0.0/24(rw,sync,no_root_squash,no_subtree_check) $ service nfs-kernel-server restart ## client $ apt-get install nfs-common $ showmount -e server | tail -1 /mnt/disk 192.168.0.0/24 $ tail -1 /etc/fstab server:/mnt/disk /mnt/nfs nfs rsize=8192,wsize=8192,intr 0 0 $ mount /mnt/nfs $ mount | tail -1 server:/mnt/disk on /mnt/nfs type nfs4 (rw,relatime,vers=4,rsize=8192,wsize=8192,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.0.137,minorversion=0,local_lock=none,addr=192.168.0.138) $ tar -cf - /mnt/nfs/ > /dev/null tar: Removing leading `/' from member names tar: Removing leading `/' from hard link targets tar: /mnt/nfs/usr/share/perl/5.14.2/Pod/: Cannot savedir: Too many levels of symbolic links tar: Exiting with failure status due to previous errors $ dmesg | tail [ 63.912327] RPC: Registered named UNIX socket transport module. [ 63.913801] RPC: Registered udp transport module. [ 63.914713] RPC: Registered tcp transport module. [ 63.915644] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 63.949485] FS-Cache: Loaded [ 63.972688] FS-Cache: Netfs 'nfs' registered for caching [ 63.993300] Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx). [ 284.733629] loop: module loaded [ 840.372846] NFS: directory 5.14.2/Pod contains a readdir loop.Please contact your server vendor. The file: Simple has duplicate cookie 18 [ 840.375842] NFS: directory 5.14.2/Pod contains a readdir loop.Please contact your server vendor. The file: Simple has duplicate cookie 18 There are no messages on the server when this happens. The message on the client repeats on every attempt, this "Cannot savedir" above may be triggering it. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
