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[Bug 1118447] Re: Race condition with network and NFS mounts causes boottime hang

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Christopher, thank you for your comment on the outdated BIOS version. I completely see your point about good quality of bug reports.
It may be some time until I can update our BIOSes, however. These are LTSP servers powering a whole school with 700 every-day users, it's elementary they are stable. For us being teachers by our main profession, it's a tough job running a network, since our superior authorities grant us almost no time for doing it. It's like you have a full-time job that keeps you busy 120% of your time and you are asked to run the company network in your free time -- with full responsibility.
I heavily rely on sources like launchpad for doing that job, but I simply cannot always be in time with running tests on that system. Still, I want to give back a little by writing bug reports and helping to resolve bugs where I can.

I will certainly find opportunity to upgrade our BIOSes sooner or later,
but as others confirm the bug, I would not want to let this block the
bug resolution process. Thanks to all for your help and effort!

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https://bugs.launchpad.net/bugs/1118447

Title:
  Race condition with network and NFS mounts causes boottime hang

Status in “linux” package in Ubuntu:
  Confirmed
Status in “nfs-utils” package in Ubuntu:
  Incomplete

Bug description:
  I seem to experience a race condition during boot of my ubuntu 12.04 server: In approx. one of seven boots, the server hangs during bootup.
  This is what I see on the screen:

  After the line

   * Starting configure network device

  there is a short delay of about 1 second, then messages continue. I
  see

   * Starting Mount network filesystems [ OK ]
   * Starting set sysctls from /etc/sysctl.conf [ OK ]
   * Starting configure network device [ OK ]
   * Stopping Mount network filesystems [ OK ]
   * Stopping set sysctls from /etc/sysctl.conf [ OK ]
   * Starting Block the mounting event for NFS filesytems until statd is running [ OK ]
   * Stopping Block the mounting event for NFS filesytems until statd is running [ OK ]
   * Starting Block the mounting event for NFS filesytems until statd is running [ OK ]
   * Stopping Block the mounting event for NFS filesytems until statd is running [ OK ]

  The last messages repeats several times, and then the boot process hangs.
  In 6/7 of cases, I wait for a minute, and after that bootup continues.

  But in approx 1/7 cases, the system hangs at this point forever. The
  machine does not respond to CTRL-ALT-DEL, I have to reboot it using
  SysRq-Keys.

  WORKAROUND: Setting the NFS entries in fstab to "noauto" completely removes the problem:
  There is no timeout during boot, and no lockup any more. The machine boote smoothly with the NFS-shares unmounted. After the machine is up, we can manually mount the NFS-shares without a problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-37-generic 3.2.0-37.58
  ProcVersionSignature: Ubuntu 3.2.0-37.58-generic 3.2.35
  Uname: Linux 3.2.0-37-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices: aplay: device_list:252: keine Soundkarten gefunden ...
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  ArecordDevices: arecord: device_list:252: keine Soundkarten gefunden ...
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D2c', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  CurrentDmesg: [   85.200104] lxcbr0: no IPv6 routers present
  Date: Thu Feb  7 15:50:40 2013
  HibernationDevice: RESUME=UUID=6c172536-57cc-4deb-867a-0718d572f23e
  IwConfig:
   lo        no wireless extensions.

   eth0      no wireless extensions.

   lxcbr0    no wireless extensions.
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=de:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-37-generic root=/dev/mapper/lvmvg-root ro debug splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Es läuft kein PulseAudio-Dienst oder nicht als Sessiondienst.
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-37-generic N/A
   linux-backports-modules-3.2.0-37-generic  N/A
   linux-firmware                            1.79.1
  RfKill:

  SourcePackage: linux
  UpgradeStatus: Upgraded to precise on 2012-04-28 (285 days ago)
  dmi.bios.date: 07/04/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0302
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A97 EVO R2.0
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0302:bd07/04/2012:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97EVOR2.0:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: To be filled by O.E.M.

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