On 2/6/2017 1:46 μμ, Nikolaos Milas wrote: > After a bit of search, I found the associated reports: > > https://bugs.centos.org/view.php?id=13351 > https://bugzilla.redhat.com/show_bug.cgi?id=1454876 > > No solution yet, but -as a workaround- it seems that -at least- nfs > problems are indeed solved with downgrading. I have been working fine with CentOS 7.3, since I downgraded to rpcbind-0.2.0-38.el7.x86_64. Today, I decided to upgrade to 7.4 (which, among several hundred updates, includes rpcbind-0.2.0-42.el7.x86_64); after that I have started having similar NFS issues again: NFS communication hungs. In /var/log/messages: ----------------------------------------------------------------------------------------- ... Sep 22 11:03:21 hesperia1 kernel: RPC: Registered named UNIX socket transport module. Sep 22 11:03:21 hesperia1 kernel: RPC: Registered udp transport module. Sep 22 11:03:21 hesperia1 kernel: RPC: Registered tcp transport module. Sep 22 11:03:21 hesperia1 kernel: RPC: Registered tcp NFSv4.1 backchannel transport module. Sep 22 11:03:21 hesperia1 systemd-udevd: starting version 219 Sep 22 11:03:21 hesperia1 systemd: Started Configure read-only root support. Sep 22 11:03:21 hesperia1 kernel: Installing knfsd (copyright (C) 1996 okir at monad.swb.de). Sep 22 11:03:21 hesperia1 systemd: Mounted NFSD configuration filesystem. ... Sep 22 11:03:27 hesperia1 systemd: Mounting /mnt/dd2500-1... Sep 22 11:03:27 hesperia1 systemd: Starting Notify NFS peers of a restart... Sep 22 11:03:27 hesperia1 sm-notify[948]: Version 1.3.0 starting Sep 22 11:03:27 hesperia1 systemd: Started Notify NFS peers of a restart. Sep 22 11:03:27 hesperia1 systemd: Started OpenSSH server daemon. Sep 22 11:03:27 hesperia1 kernel: FS-Cache: Loaded Sep 22 11:03:27 hesperia1 kernel: FS-Cache: Netfs 'nfs' registered for caching Sep 22 11:03:27 hesperia1 systemd: Mounted /mnt/dd2500-1. Sep 22 11:03:27 hesperia1 systemd: Reached target Remote File Systems. Sep 22 11:03:27 hesperia1 systemd: Starting Remote File Systems. ... Sep 22 11:11:16 hesperia1 kernel: nfs: server 10.201.40.34 not responding, still trying ... Sep 22 11:20:44 hesperia1 kernel: nfs: server 10.201.40.34 not responding, still trying ... ----------------------------------------------------------------------------------------- I tried downgrading to rpcbind-0.2.0-38.el7.x86_64 but this time it didn't help. I mount either directly: mount -vv -o auto,noatime,nolock,bg,nfsvers=3,intr,tcp,actimeo=1800 -t nfs 10.201.40.34:/data/col1/hesperia-mount /hesperiamount2 or through /etc/fstab: 10.201.40.34:/data/col1/hesperia-mount /hesperiamount2 nfs auto,noatime,nolock,bg,nfsvers=3,intr,tcp,actimeo=1800 0 The box may even hung during reboot, which has never happened in the past. It needs a hard reboot (via VM admin console) to boot again. I have confirmed the above behavior multiple times. Please advise me on how to resolve this situation. We are very much dependent on NFS mounts. Is it a known bug? (As far as I could search, I didn't came up with something.) The earlier bug report appears resolved: https://bugzilla.redhat.com/show_bug.cgi?id=1454876 Can I safely/easily revert to 7.3? Thanks in advance, Nick