Bug#458327: on reboot mdadm fails to mount all drives in a raid5 array

[richard]

Package: mdadm
Version: 2.6.3+200709292116+4450e59-3
Severity: important


This computer has, amongst others, two raid5 partitions.

The system is shut down via a "standard" command. When rebooted, 
sdd1 and sdd2 are missing. The raid5 arrays get manually rebuilt 
using the # mdadm --manage --re-add  command. 

On one occasion an abnormal shutdown occurred. On reboot both raid5 
arrays were detected as degraded and were automatically rebuilt and 
were reassembled correctly.  

If, following a "normal" shutdown and reboot, an event were to occur 
that caused a loss of data before the raid5 arrays were manually 
restored, mdadm would be unable to recover the information from 
either raid5 array. This is a bug.    


-- Package-specific info:
--- mount output
/dev/md0 on / type ext3 (rw,errors=remount-ro)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
procbususb on /proc/bus/usb type usbfs (rw)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
/dev/md2 on /home type ext3 (rw,errors=remount-ro)
/dev/md3 on /var type ext3 (rw,errors=remount-ro)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)

--- mdadm.conf
DEVICE /dev/sd[abcde]1
DEVICE /dev/sd[cde]2
DEVICE /dev/sd[ab]3
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=a7ccc6ae:0b19165f:53868f85:2f9f5918
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=04c38589:b3f84631:8c0b1476:c50c7236
ARRAY /dev/md2 level=raid5 num-devices=3 spares=1 UUID=5319b6ab:c6492e30:3cde2480:e3073515
ARRAY /dev/md2 devices=/dev/sdc1,/dev/sdd1,/dev/sde1
ARRAY /dev/md3 level=raid5 num-devices=3 spares=1 UUID=52db6426:52314f0e:3cde2480:e3073515
ARRAY /dev/md3 devices=/dev/sdc2,/dev/sdd2,/dev/sde2
MAILADDR root

--- /proc/mdstat:
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] 
md1 : active raid1 sdb3[1] sda3[0]
      96320 blocks [2/2] [UU]
      
md2 : active raid5 sdd1[2] sde1[1] sdc1[0]
      1171877248 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
      
md3 : active raid5 sdd2[2] sde2[1] sdc2[0]
      293266432 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
      
md0 : active raid1 sdb1[1] sda1[0]
      35158144 blocks [2/2] [UU]
      
unused devices: <none>

--- /proc/partitions:
major minor  #blocks  name

   8     0   36151920 sda
   8     1   35158221 sda1
   8     2     891607 sda2
   8     3      96390 sda3
   8    16   36151920 sdb
   8    17   35158221 sdb1
   8    18     891607 sdb2
   8    19      96390 sdb3
   8    32  732574584 sdc
   8    33  585938713 sdc1
   8    34  146633287 sdc2
   8    48  732574584 sdd
   8    49  585938713 sdd1
   8    50  146633287 sdd2
   8    64  732574584 sde
   8    65  585938713 sde1
   8    66  146633287 sde2
   9     0   35158144 md0
   9     3  293266432 md3
   9     2 1171877248 md2
   9     1      96320 md1

--- initrd.img-2.6.22-ver.1.3:

--- /proc/modules:
dm_snapshot 19272 0 - Live 0xffffffff881f8000
dm_mirror 24192 0 - Live 0xffffffff881f1000

--- volume detail:

--- /proc/cmdline
root=/dev/md0 ro 

--- grub:
kernel		/boot/vmlinuz-2.6.22-ver.1.3 root=/dev/md0 ro 
kernel		/boot/vmlinuz-2.6.22-ver.1.3 root=/dev/md0 ro single
kernel		/boot/vmlinuz-2.6.21 root=/dev/md0 ro 
kernel		/boot/vmlinuz-2.6.21 root=/dev/md0 ro single
kernel		/boot/vmlinuz-2.6.18-4-amd64 root=/dev/md0 ro 
kernel		/boot/vmlinuz-2.6.18-4-amd64 root=/dev/md0 ro single


-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.22-ver.1.3 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages mdadm depends on:
hi  debconf [debconf-2.0]         1.5.17     Debian configuration management sy
ii  libc6                         2.7-4      GNU C Library: Shared libraries
hi  lsb-base                      3.1-24     Linux Standard Base 3.1 init scrip
hi  makedev                       2.3.1-84   creates device files in /dev
hi  udev                          0.114-2    /dev/ and hotplug management daemo

Versions of packages mdadm recommends:
hi  exim4-daemon-light [mail-tra 4.68-2      lightweight Exim MTA (v4) daemon
hi  module-init-tools            3.3-pre11-4 tools for managing Linux kernel mo

-- debconf information:
  mdadm/autostart: true
  mdadm/mail_to: root
  mdadm/initrdstart_msg_errmd:
* mdadm/initrdstart: all
  mdadm/initrdstart_msg_errconf:
  mdadm/initrdstart_notinconf: false
  mdadm/initrdstart_msg_errexist:
  mdadm/initrdstart_msg_intro:
  mdadm/autocheck: true
  mdadm/initrdstart_msg_errblock:
  mdadm/start_daemon: true