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 -- 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/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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/931877/+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
