[Bug 665939] [NEW] RAID fails to assemble at boot

[JRavasi]

Public bug reported:

This installation has a RAID 5 array created from three partitions
(sda3, sdb1, sdc1), with a LVM VG on top of it.

When booting, about 30% of the time, the RAID array simply fails to
assemble, showing the message in the attached screenshot. As a result,
I'm dropped into a busybox shell from initramfs. Once there, the problem
is solved by simply issuing:

    mdadm --assemble --scan
    exit

After that, the boot resumes normally. There is really no problem with
the RAID at all. Everything is fine on a second try.

Investigating the kernel messages during the affected boots, it seems
that SATA disks are probed in parallel (this is a multi-core machine),
and it may be possible that md starts assembling the arrays while some
disks are still not completely available.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.35
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  juliano    2781 F.... kmix
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0000000 irq 22'
   Mixer name	: 'Realtek ALC889'
   Components	: 'HDA:10ec0889,80860022,00100004'
   Controls      : 42
   Simple ctrls  : 24
Date: Sun Oct 24 04:53:38 2010
HibernationDevice: RESUME=UUID=4f433bf6-748e-432d-b93f-de4d0e693b91
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101008)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=/dev/mapper/Nagisa1-Root ro rootdelay=5
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 
SourcePackage: linux
UserAsoundrc:
 #pcm.!default plug:hw:0 
 #ctl.!default hw:0
dmi.bios.date: 08/30/2010
dmi.bios.vendor: Intel Corp.
dmi.bios.version: SOX5810J.86A.5456.2010.0830.0013
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: DX58SO
dmi.board.vendor: Intel Corporation
dmi.board.version: AAE29331-703
dmi.chassis.type: 2
dmi.modalias: dmi:bvnIntelCorp.:bvrSOX5810J.86A.5456.2010.0830.0013:bd08/30/2010:svn:pn:pvr:rvnIntelCorporation:rnDX58SO:rvrAAE29331-703:cvn:ct2:cvr:

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kernel-fs maverick needs-upstream-testing

-- 
RAID fails to assemble at boot
https://bugs.launchpad.net/bugs/665939
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