Looks like the --scan command might be useless as it seems only to work
properly when the array is defined correctly in mdadm.conf. All my
devices can be examined with --examine and do not show those odd
"failed" lines. While not being able to reproduce the exact issue,
removing the array definition from mdadm.conf gets me into a similar
problem and mdadm seems not to work right at that point. But that
happens with the old -46 and newer -50 kernels.

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https://bugs.launchpad.net/bugs/1209423

Title:
  [STAGING] 2.6.32-47 kernel update on 10.04 breaks software RAID at
  boot

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After update from 2.6.32-46 to 2.6.32-47 one of the md arrays does not
  start anymore at boot time. The RAID 1 md0 now causes message
  "Continue to wait; or Press S to skip mounting or M for manual
  recovery" at boot. I used "S" to create this report as requested in a
  similar bug report
  (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1190295) by user
  "penalvch"

  Booting back into 2.6.32-46 the md devices are correctly set up and
  the system boots normally. See the linked bug for further details,
  such as:

  The array that does not start anymore has the following config:
  level=raid1 metadata=1.2 num-devices=2

  While a second array with metadata=1.0 seems to be recognized and
  started correctly.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-50-generic 2.6.32-50.112
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.32-50.112-generic 2.6.32.61+drm33.26
  Uname: Linux 2.6.32-50-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alan       1991 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf6220000 irq 22'
     Mixer name : 'Realtek ALC888'
     Components : 'HDA:10ec0888,80860034,00100202'
     Controls      : 28
     Simple ctrls  : 16
  Date: Thu Aug  8 02:01:09 2013
  HibernationDevice: RESUME=UUID=b1649a13-fffd-4e98-b42b-a5e9ea98f9fc
  InstallationMedia: Ubuntu 10.04.4 LTS "Lucid Lynx" - Release amd64 
(20120214.2)
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-50-generic 
root=UUID=e69dddfa-14a0-499f-9267-edca27fbd7a4 ro quiet splash
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.34.14
  RfKill:
   0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  StagingDrivers: r8192s_usb
  Title: [STAGING]
  dmi.bios.date: 04/19/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: WBIBX10J.86A.0293.2010.0419.1819
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DP55WB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE64798-207
  dmi.chassis.type: 2
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrWBIBX10J.86A.0293.2010.0419.1819:bd04/19/2010:svn:pn:pvr:rvnIntelCorporation:rnDP55WB:rvrAAE64798-207:cvn:ct2:cvr:

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