I'm sorry it was some time ago when I submitted this. I have since upgraded to 5.13.19 and 5.16 on some machines and these latter kernels seems to have resolved the issue.
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874. On Mon, 14 Feb 2022, Andreas Hasenack wrote: > Date: Mon, 14 Feb 2022 20:21:46 -0000 > From: Andreas Hasenack <1881...@bugs.launchpad.net> > To: nan...@eskimo.com > Subject: [Bug 1881847] Re: If NFS server reboots, > client somethings fails to remount the file system properly > > With NFSv4, user and group information is sent on the wire as names, > instead of uids. And these names are qualified with a domain. So for > example an exported directory containing files for the "ubuntu" user > will have the ownership sent to NFSv4 clients as "ubuntu@DOMAIN", where > "DOMAIN" is the DNS domain of the server. > > Whave I have seen in some testing is that after a reboot, for some > reason (probably service ordering), the NFS server bits do not know yet > the domain of the machine, and then this becomes "localdomain", and the > user is sent to the client as "ubuntu@localdomain". The client, being on > the same DNS domain, decides that "localdomain" is none of its business, > and declares that user as "nobody". > > You said there was a "hang", but maybe the issue above is realted > somehow? One way to see it is in the client logs, where "nfsidmap" is > called. If you configure /etc/request-key.d/id_resolver.conf to call > nfidmap with extra "-v -v -v" in the command line, it will be more > verbose in /var/log/syslog and say which user it's trying to resolve. > > If you see the "localdomain" issue, then try hardcoding the domain in > /etc/idmapd.conf on both the server and the client, to your actual DNS > domain, and see if that helps. > > > Hope this helps > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1881847 > > Title: > If NFS server reboots, client somethings fails to remount the file > system properly > > Status in nfs-utils package in Ubuntu: > New > > Bug description: > If the NFS server reboots, sometimes client servers fail to re- > establish the NFS mount properly. This is using NFS v4.2. The client > machine will hang if I try to do a df when an NFS mount is in this > condition. Attempting to access a file will likewise hang > indefinitely. This is a problem with the stock 5.3.0.x kernel and it > is a problem with 5.6 still. I have not tried 5.7 yet. I filed this > against nfs-kernel, but I am not 100% sure it is not nfs-common but > there is some sort of communications not happening between them. > > ProblemType: Bug > DistroRelease: Ubuntu 20.04 > Package: nfs-kernel-server 1:1.3.4-2.5ubuntu3 > Uname: Linux 5.6.0 x86_64 > ApportVersion: 2.20.11-0ubuntu27.2 > Architecture: amd64 > CasperMD5CheckResult: skip > CurrentDesktop: MATE > Date: Tue Jun 2 21:34:31 2020 > InstallationDate: Installed on 2017-05-27 (1102 days ago) > InstallationMedia: Ubuntu-MATE 17.04 "Zesty Zapus" - Release amd64 (20170412) > SourcePackage: nfs-utils > UpgradeStatus: Upgraded to focal on 2020-04-26 (38 days ago) > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1881847/+subscriptions > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1881847 Title: If NFS server reboots, client somethings fails to remount the file system properly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1881847/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs