Thank you for bringing this to our attention. The following commits were made between Ubuntu versions 5.15.0-60.66 and 5.15.0-67.74:
f391395fb6b1: NFS: Fix up a sparse warning bcf920d0e616: NFS: Judge the file access cache's timestamp in rcu path 2cbb6062f8eb: NFS: Clear the file access cache upon login e549585b0c95: NFSD: fix use-after-free in __nfs42_ssc_open() 68873d735d98: NFSv4: Retry LOCK on OLD_STATEID during delegation return We suspect that either the file access cache-related commits (i.e., 2cbb6062f8eb/bcf920d0e616/f391395fb6b1) or the retry lock commit (i.e., 68873d735d98) may be causing the issue you are experiencing. To help diagnose the problem, we have created a test kernel that reverts the commit 68873d735d98. To install the test kernel, please run the following commands: sudo add-apt-repository ppa:chengendu/jammy-nfs-test sudo apt update apt install linux-image-unsigned-5.15.0-67-generic After installing the test kernel, we would appreciate it if you could test it to see if the issue is resolved. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2009325 Title: NFS deathlock with last Kernel 5.4.0-144.161 and 5.15.0-67.74 Status in linux package in Ubuntu: Confirmed Bug description: After updating on the kernel 5.4.0-144.161 at Ubuntu 18 and 5.15.0-67.74 at Ubuntu 20, we have a 100% CPU outlation and 20 to 30 Mbit traffic to the clients for our NFS servers. All clients are extremely slow when it comes to access to the NFS resources. Restart and use older kernel, fixed the problem. Ubuntu 18 5.4.0-139-generic Ubuntu 20 5.15.0-60-Generic I don't have a NFS problem with this kernel. Problem came with the last releas on March 3rd, 2023 --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Mär 4 15:00 seq crw-rw---- 1 root audio 116, 33 Mär 4 15:00 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.11-0ubuntu27.25 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CasperMD5CheckResult: skip DistroRelease: Ubuntu 20.04 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Error: command ['lsusb'] failed with exit code 1: Lsusb-t: Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1: MachineType: VMware, Inc. VMware Virtual Platform Package: linux (not installed) PciMultimedia: ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-67-generic root=/dev/mapper/vg1-root ro net.ifnames=0 biosdevname=0 kvm.nx_huge_pages=auto elevator=noop ProcVersionSignature: Ubuntu 5.15.0-67.74~20.04.1-generic 5.15.85 RelatedPackageVersions: linux-restricted-modules-5.15.0-67-generic N/A linux-backports-modules-5.15.0-67-generic N/A linux-firmware 1.187.36 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' Tags: focal Uname: Linux 5.15.0-67-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: N/A _MarkForUpload: True dmi.bios.date: 11/12/2020 dmi.bios.release: 4.6 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.name: 440BX Desktop Reference Platform dmi.board.vendor: Intel Corporation dmi.board.version: None dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.ec.firmware.release: 0.0 dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd11/12/2020:br4.6:efr0.0:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:sku: dmi.product.name: VMware Virtual Platform dmi.product.version: None dmi.sys.vendor: VMware, Inc. --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Mär 4 15:03 seq crw-rw---- 1 root audio 116, 33 Mär 4 15:03 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.28 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 18.04 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lsusb: Error: command ['lsusb'] failed with exit code 1: MachineType: VMware, Inc. VMware Virtual Platform Package: linux (not installed) PciMultimedia: ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.0.0-43-generic root=/dev/mapper/vg1-root ro net.ifnames=0 biosdevname=0 kvm.nx_huge_pages=auto elevator=noop ProcVersionSignature: Ubuntu 5.0.0-43.47~18.04.1-generic 5.0.21 RelatedPackageVersions: linux-restricted-modules-5.0.0-43-generic N/A linux-backports-modules-5.0.0-43-generic N/A linux-firmware 1.173.21 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' Tags: bionic Uname: Linux 5.0.0-43-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 12/12/2018 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.name: 440BX Desktop Reference Platform dmi.board.vendor: Intel Corporation dmi.board.version: None dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/12/2018:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A: dmi.product.name: VMware Virtual Platform dmi.product.version: None dmi.sys.vendor: VMware, Inc. 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