@Li, your patched kernel does not exhibit this problem:

...
[   40.606710] md0: detected capacity change from 0 to 19994247168
udevd[222]: inotify_add_watch(6, /dev/dm-0, 10) failed: Invalid argument

done.
[   44.238967] pool #0: pkt_size=1536, buf_size=1632 - 2048 of 2048 buffers 
added

Ubuntu 12.04 LTS n4 ttyS0

n4 login: ubuntu
Password: 
Last login: Sun May  6 00:38:01 BST 2012 on ttyS0
Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.2.0-1602-armadaxp armv7l)

 * Documentation:  https://help.ubuntu.com/
unubuntu@n4:~$ uname -a
Linux n4 3.2.0-1602-armadaxp #5 SMP Tue Apr 24 02:17:06 UTC 2012 armv7l armv7l 
armv7l GNU/Linux
ubuntu@n4:~$ md5sum /boot/uI
md5sum: /boot/uI: No such file or directory
ubuntu@n4:~$ md5sum /boot/uImage
bc919e5071962e60ae787628a66e41f2  /boot/uImage
ubuntu@n4:~$ md5sum linux-image-3.2.0-1602-armadaxp_3.2.0-1602.5_armhf.deb 
c848b5c20dbe0b8afb3dc7d2f4be9b6c  
linux-image-3.2.0-1602-armadaxp_3.2.0-1602.5_armhf.deb
ubuntu@n4:~$ sudo reboot

Broadcast message from ubuntu@n4
        (/dev/ttyS0) at 0:39 ...

The system is going down for reboot NOW!
ubuntu@n4:~$  * Stopping MD monitoring service mdadm --monitor           [ OK ] 
 * Asking all remaining processes to terminate...                        [ OK ] 
 * All processes ended within 1 seconds....                              [ OK ] 
 * Deconfiguring network interfaces...                                   [ OK ] 
 * Deactivating swap...                                                  [ OK ] 
 * Will now restart
[   85.323522] Restarting system.

BootROM 1.15
Booting from SPI flash
DDR3 Training Sequence - Ver 2.2.0 
DDR3 Training Sequence - Number of DIMMs detected: 2
DDR3 Training Sequence - Ended Successfully 
...

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https://bugs.launchpad.net/bugs/959604

Title:
  [public] bad: scheduling from the idle thread!

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