Hi, I would like to share my thoughts on the increase in LOOKUP operations, which may be attributed to a new mechanism introduced in the Linux 6.2-rc3 NFS client side. This mechanism clears the access cache as soon as the cache timestamp becomes older than the user's login time. Its primary objective is to ensure that the NFS client's access cache doesn't become stale due to any changes made to the user's group membership on the server after the user has already logged in on the client.
It's worth noting that POSIX only refreshes the user's supplementary group information upon login. Upstream has considered that it's not unreasonable for users to expect the access cache to be cleared when they log out and log back in again, with all behavior returning to normal after the replacement. You can find all the details logged in the commit 0eb43812c027 (NFS: Clear the file access cache upon login). If you have any concerns or experience unexpected behavior, please don't hesitate to inform us. We are always ready to discuss and collaborate with upstream to resolve any issues. Thank you for taking the time to test and provide us with valuable feedback. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-aws 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: In Progress Status in linux-aws package in Ubuntu: Invalid Status in linux source package in Bionic: Fix Released Status in linux-aws source package in Bionic: Fix Released Status in linux source package in Focal: Fix Released Status in linux-aws source package in Focal: Fix Released Status in linux source package in Jammy: Fix Released Status in linux-aws source package in Jammy: Fix Released Status in linux source package in Kinetic: Fix Released Status in linux-aws source package in Kinetic: Fix Released Status in linux source package in Lunar: In Progress Status in linux-aws source package in Lunar: Invalid 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2009325/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
