This bug is missing log files that will aid in diagnosing the problem. >From a terminal window please run:
apport-collect 1641049 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- 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/1641049 Title: NFSv4 do not invalidate cached information about deleted files Status in linux package in Ubuntu: Incomplete Bug description: When using NFSv4 client in Ubuntu 16.04 the the following sequence of actions fails. You need a NFS server (S) and two clients (A and B). Let the NFS share be mounted at /nfsdata A: echo test > /nfsdata/file B: cat /nfsdata/file ===> test A: rm /nfsdata/file B: cat /nfsdata/file ===> cat: No such file or directory A: echo test > /nfsdata/file B: cat /nfsdata/file ===> cat: No such file or directory (!) Doing echo 3 > proc/sys/vm/drop_caches as root makes the file visible on B. 14.04 works without any problem. I have attached log from one of our servers, 4.4.0-47 kernel does not fix this issue. Syslog contains rpcdebug -m nfs -s all output for the scenario (with different filenames). I can do full packet capture of NFS traffic if you want. Mounting nfs with lookupcache=positive do not fix this issue. NFSv4 server is CentOS 6.7 in our case. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-45-generic 4.4.0-45.66 ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21 Uname: Linux 4.4.0-45-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Nov 8 03:13 seq crw-rw---- 1 root audio 116, 33 Nov 8 03:13 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.1 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: Date: Fri Nov 11 17:06:51 2016 HibernationDevice: RESUME=UUID=7b92d2e2-e481-471a-bc38-e178a9418aa1 InstallationDate: Installed on 2016-11-07 (3 days ago) InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 002 Device 002: ID 8087:8002 Intel Corp. Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 413c:a001 Dell Computer Corp. Hub Bus 001 Device 002: ID 8087:800a Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. PowerEdge R630 PciMultimedia: ProcEnviron: LC_CTYPE=en_US.UTF-8 TERM=screen-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-45-generic.efi.signed root=UUID=11e697e5-38f8-41ae-863c-2755793044a6 ro RelatedPackageVersions: linux-restricted-modules-4.4.0-45-generic N/A linux-backports-modules-4.4.0-45-generic N/A linux-firmware 1.157.4 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/12/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.0.1 dmi.board.name: 02C2CP dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.0.1:bd02/12/2016:svnDellInc.:pnPowerEdgeR630:pvr:rvnDellInc.:rn02C2CP:rvrA01:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R630 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1641049/+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