Public bug reported: We just upgraded our nfs servers from 5.4.0-72 to 5.4.0-92.
We are using NFS v3 in a large computer science department, with several hundred clients. Lots of applications are now failing because locks don't work. /var/log/syslog on the client reports lockd not responding. tcpdump shows that the client tries to connect to lockd but there is no response to the TCP SYN. netstat on the server shows some connections open, with lots of bytes in the receive queue. The problem probably occurs only with lots of clients. I believe any typical test would work fine. The problem is new. That is, it didn't happen in 5.4.0-72. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: kernel-common (not installed) ProcVersionSignature: Ubuntu 5.4.0-92.103-generic 5.4.157 Uname: Linux 5.4.0-92-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 CasperMD5CheckResult: pass Date: Fri Jan 7 13:07:34 2022 InstallationDate: Installed on 2020-10-14 (450 days ago) InstallationMedia: Ubuntu-Server 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731) SourcePackage: kernel-package UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.default.apport: [modified] mtime.conffile..etc.default.apport: 2020-10-14T13:53:33.474467 ** Affects: kernel-package (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug focal uec-images -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1956787 Title: nfs v3 locking fails To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kernel-package/+bug/1956787/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs