kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I'd like to perform a bisect to figure out what commit caused this
regression. We need to identify the earliest kernel where the issue
started happening as well as the latest kernel that did not have this
issue.

Can you test the following kernels and post back? We are looking for the
first kernel version that exhibits this bug:

v3.13.10: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11-trusty/
v3.13.11.1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11.1-trusty/
v3.13.11.2: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.11.2-trusty/


You don't have to test every kernel, just up until the kernel that first
has this bug.

Thanks in advance!

** Tags added: performing-bisect

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

-- 
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