[Bug 941874] Re: (fakeraid) root device not activated during boot

[DrTwox]

I have this same problem with Kubuntu Precise Beta1.
I installed Kubuntu Precise Beta1 successfully (using default partition setup with a single SATA drive) and rebooted. The desktop loads without error. I run apt-get update && apt-get upgrade and then reboot. Now the boot process stops:
…
Gave up waiting for root device. Common problems:
 - Boot args (cat /proc/cmdline)
    - Check root delay= (did the system wait long enough?)
    - Check root= (did the system wait for the right device?)
 - Missing modules (cat /proc/modules; ls /dev)
ALERT! /dev/disk/by-uuid/8e6f9262-9fbb-48fb-b1f1-a5ba22f25554 does not exist.
Dropping to a shell!

BusyBox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu2) build in shell (ash)
Enter 'help' for a list of built-in commands

(initramfs) cat /proc/partitions
major minor  #blocks  name

 11                0      1048575 sr0
  8                0    117220824 sda
252                0    117220823 dm-0

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https://bugs.launchpad.net/bugs/941874

Title:
  (fakeraid) root device not activated during boot

Status in “dmraid” package in Ubuntu:
  Fix Released
Status in “multipath-tools” package in Ubuntu:
  Incomplete

Bug description:
  I have installed Precise Pangolin Alpha 2 to a fakeraid stripe, but
  ubuntu fails to boot after install. When choosing recovery option, the
  boot process times out waiting for root device and drops to busybox
  shell. Running "dmraid -ay" and exiting busybox resumes boot and it
  continues normally.

  ---
  The problems are:

  * There are no initramfs hooks for kpartx, so kpartx is not available during boot.
  the following files are needed:
  /sbin/kpartx
  /lib/udev/kpartx_id
  /lib/udev/dmsetup_env
  /lib/udev/rules.d/95-kpartx.rules

  * The hook for dmraid udev rules is wrong:
  The script /usr/share/initramfs-tools/hooks/dmraid
  tries to add:
  /lib/udev/rules.d/85-dmraid.rules
  but the existing file is called:
  /lib/udev/rules.d/97-dmraid.rules

  After fixing the above two issues, system boots normally.

  * dmraid-activate is sometimes called with full device name
  dmraid-activate expecte device name withouth "/dev/", e.g. "sda" not "/dev/sda". However the script
  /usr/share/initramfs-tools/scripts/local-top/dmraid
  calls dmraid-activate using the full device name and path.

  * There might also be antoher bug on line 100 in dmraid-activate (in the awk script):
      # Heximal to decimal conversion array
      for (i = 0; i <= 9; i++) hex2dec[i] = i
      hex2dec["a"] = 10; hex2dec["b"] = 11; hex2dec["c"] = 12
      hex2dec["e"] = 13; hex2dec["d"] = 14; hex2dec["f"] = 15;
  Element "e" and "d" appears to have been switched. I'm not entirely sure what the script is trying to do though, and that part of the script does not affect my system.

  ---
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: dmraid 1.0.0.rc16-4.1ubuntu6 [modified: sbin/dmraid-activate usr/share/initramfs-tools/scripts/local-top/dmraid]
  ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
  Uname: Linux 3.2.0-17-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 1.93-0ubuntu2
  Architecture: amd64
  Date: Mon Feb 27 12:59:55 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120201.2)
  ProcEnviron:
   PATH=(custom, user)
   LANG=sv_SE.UTF-8
   SHELL=/bin/bash
  SourcePackage: dmraid
  UpgradeStatus: Upgraded to precise on 2012-02-21 (5 days ago)

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