Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.5 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5-rc3-wily/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete ** Tags added: kernel-da-key -- 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/1542826 Title: NFS Client Ignores TCP Resets Status in linux package in Ubuntu: Incomplete Bug description: Steps to reproduce: 1) Mount NFS share from HA cluster with TCP. 2) Failover the HA cluster. (The NFS server's IP address moves from one machine to the other.) 3) Access the mounted NFS share. Expected results: Accessing the NFS mount works fine immediately. Actual results: Accessing the NFS mount hangs for 15 minutes. Then the TCP connection times out, a new connection is established, and it works fine again. After the IP moves, the new server responds to the client with TCP RST packets, just as I would expect. I would expect the client to tear down its TCP connection immediately and re-establish a new one. But it doesn't. Am I confused, or is this a bug? For the duration of this test, ufw was disabled on the client machine. I have a packet capture. We've been using UDP instead of TCP as a work-around. The system is running Ubuntu 14.04 with Linux 3.13.0-76-generic. --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Feb 3 18:41 seq crw-rw---- 1 root audio 116, 33 Feb 3 18:41 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=/dev/mapper/data-swap InstallationDate: Installed on 2015-07-11 (210 days ago) InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2) MachineType: Silicon Mechanics Storform iServ R515.v2.1 Package: linux (not installed) PciMultimedia: ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-76-generic root=/dev/mapper/data-os ro elevator=noop console=ttyS1,115200n8 console=tty1 transparent_hugepage=always nomdmonddf nomdmonisw ProcVersionSignature: Ubuntu 3.13.0-76.120-generic 3.13.11-ckt30 RelatedPackageVersions: linux-restricted-modules-3.13.0-76-generic N/A linux-backports-modules-3.13.0-76-generic N/A linux-firmware 1.127.20 RfKill: Error: [Errno 2] No such file or directory Tags: trusty Uname: Linux 3.13.0-76-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm dialout libvirtd lpadmin sudo users WifiSyslog: _MarkForUpload: True dmi.bios.date: 05/15/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 2.0c dmi.board.asset.tag: 1234567890 dmi.board.name: X8DT6 dmi.board.vendor: Supermicro dmi.board.version: 1234567890 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 17 dmi.chassis.vendor: Supermicro dmi.chassis.version: 1234567890 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0c:bd05/15/2012:svnSiliconMechanics:pnStorformiServR515.v2.1:pvr1234567890:rvnSupermicro:rnX8DT6:rvr1234567890:cvnSupermicro:ct17:cvr1234567890: dmi.product.name: Storform iServ R515.v2.1 dmi.product.version: 1234567890 dmi.sys.vendor: Silicon Mechanics To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1542826/+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