I have installed and tested all three kernels (v3.13.10, v3.13.11.1 and v3.13.11.2) by rebooting and selecting the kernel version at the grub menu. I did however get the same 16 second delay with all of them. I went even further back and tested v3.13.10-trusty, v3.13.9-trusty, v3.13.8-trusty, v3.13.7-trusty, v3.13.6-trusty and v3.13.5-trusty but they all showed the same behavior. It still works fine when going back to 3.13.0-24-generic though.
It did however find that the problem appears to be limited to NFSv4. There is no noticable delay when using the vers=3 mount option. -- 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/1327563 Title: Long delay when mounting NFS shares Status in “linux” package in Ubuntu: Confirmed Bug description: Summary: After upgrading the kernel on Ubuntu 14.04 to 3.13.0-29-generic I found that it can take a considerably longer amount of time to mount NFS shares. How to reproduce: 1. Install Ubuntu 14.04 on two machines. A minimal server install should be fine. One will act as a server, the other as a client. 2. Upgrade the kernel on the client machine to at least 3.13.0-27-generic. 3. Install the nfs-kernel-server package on the server. 4. Add a directory to /etc/exports and run service nfs-kernel-server start. 5. Install the nfs-common package on the client. 6. Attempt to mount the shared directory on the client. Expected result: The shared directory should be mounted on the client more or less immediately. Actual result: The mount command hangs and eventually completes. In this test case it takes 16 seconds consistently. On a production machine where the problem was first discovered the time is considerably longer and essentially makes it impossible to mount NFS shares. Regression: I have been able to reproduce the problem on clients running Linux 3.13.0-27-generic and later. The problem is not reproducible on clients running Linux 3.13.0-24-generic. The problem is reproducible no matter which kernel version is used on the server. Tested client kernel versions: Linux 3.13.0-29-generic #53-Ubuntu FAIL Linux 3.13.0-27-generic #50-Ubuntu FAIL Linux 3.13.0-24-generic #47-Ubuntu OK Tested server kernel versions: Linux 3.13.0-29-generic #53-Ubuntu OK Linux 3.13.0-27-generic #50-Ubuntu OK Linux 3.13.0-24-generic #47-Ubuntu OK lsb_release -rd: Description: Ubuntu 14.04 LTS Release: 14.04 apt-cache policy linux-image-generic: linux-image-generic: Installed: (none) Candidate: 3.13.0.29.35 Version table: 3.13.0.29.35 0 500 http://se.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 3.13.0.24.28 0 500 http://se.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-29-generic 3.13.0-29.53 ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2 Uname: Linux 3.13.0-29-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Jun 7 16:26 seq crw-rw---- 1 root audio 116, 33 Jun 7 16:26 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: [Errno 2] No such file or directory: 'fuser' CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Sat Jun 7 16:30:02 2014 HibernationDevice: RESUME=UUID=9c13108b-d40a-4881-b563-c477ed2e6804 InstallationDate: Installed on 2014-06-07 (0 days ago) InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: QEMU Standard PC (i440FX + PIIX, 1996) ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=9068010d-8332-47c8-ae62-ccc62ca57290 ro RelatedPackageVersions: linux-restricted-modules-3.13.0-29-generic N/A linux-backports-modules-3.13.0-29-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/01/2011 dmi.bios.vendor: Bochs dmi.bios.version: Bochs dmi.chassis.type: 1 dmi.chassis.vendor: Bochs dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.0:cvnBochs:ct1:cvr: dmi.product.name: Standard PC (i440FX + PIIX, 1996) dmi.product.version: pc-i440fx-2.0 dmi.sys.vendor: QEMU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1327563/+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
