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

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Andrew Radke, thank you for your comments. Regarding them https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1118447/comments/21 :
>"I can confirm this bug on different hardware with completely up to date BIOS and firmware. The race condition we are seeing is being reported from varied sources on different hardware over a significant period of time so I think it is very unlikely to be effected by BIOS of firmware versions. I believe the status should still be confirmed."

Despite it being replicated on disparate hardware, It is strongly
preferred folks with an outdated BIOS update to the latest from their
vendor. We can let this not be a show stopper, but please do not remove
the tag as it's used for tracking purposes.

In any event, could you please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.13-rc6

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's
Status as Confirmed. Please let us know your results. Thank you for your
understanding.

** Tags added: bios-outdated-1903

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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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