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["Jan K." <931877@xxxxxxxxxxxxxxxxxx>]

I see the same problem in a fresh installed Ubuntu 14.04 LTS. However it
only blocks for about 60s in my case. See the attached bootchart.

** Attachment added: "jan-home-trusty-20140423-1.png"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/931877/+attachment/4096319/+files/jan-home-trusty-20140423-1.png

** Changed in: linux (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/931877

Title:
  Task udevadm:X blocked at boot

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The 3.0.0-16 kernel is unable to boot due to udevadm  hanging. I'm
  dual booting Windows 7 and Ubuntu 11.10 on my laptop, but when i try
  to boot ubuntu, it drops to BusyBox complaining about giving up
  waiting on the root device. ls /dev shows that the device file for my
  hard drive is not there. Adding "rootdelay=300" to the boot arguments
  allows my hard drive to be seen after approximately 4 minutes and the
  boot can continue fine. An inspection of /var/log/syslog shows that
  the udevadm task is being "blocked" at boot for a long time (see
  attachment). It seems to be related to ACPI as "acpi=off" allows me to
  boot normally, however any other acpi boot options, such as acpi=ht,
  acpi=noirq, and so forth do not fix the problem, and udevadm still
  hangs.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-16-generic 3.0.0-16.28
  ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
  Uname: Linux 3.0.0-16-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: NVidia [HDA NVidia], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  darius     1483 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'NVidia'/'HDA NVidia at 0xf6480000 irq 34'
     Mixer name	: 'Conexant CX20549 (Venice)'
     Components	: 'HDA:14f15045,103c30cf,00100100'
     Controls      : 20
     Simple ctrls  : 9
  Date: Mon Feb 13 22:48:11 2012
  HibernationDevice: RESUME=UUID=9c6b2f19-75db-4204-b395-57f227ac57e5
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 002: ID 04f2:b023 Chicony Electronics Co., Ltd Gateway USB 2.0 Webcam
  MachineType: Hewlett-Packard HP Pavilion dv9500 Notebook PC
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-16-generic root=UUID=b620339e-92d5-4656-85dc-afc620ce7049 ro acpi=off irqpoll quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-16-generic N/A
   linux-backports-modules-3.0.0-16-generic  N/A
   linux-firmware                            1.60
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/22/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.34
  dmi.board.name: 30D1
  dmi.board.vendor: Quanta
  dmi.board.version: 85.26
  dmi.chassis.type: 10
  dmi.chassis.vendor: Quanta
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.34:bd03/22/2011:svnHewlett-Packard:pnHPPaviliondv9500NotebookPC:pvrRev1:rvnQuanta:rn30D1:rvr85.26:cvnQuanta:ct10:cvrN/A:
  dmi.product.name: HP Pavilion dv9500 Notebook PC
  dmi.product.version: Rev 1
  dmi.sys.vendor: Hewlett-Packard

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