Bug#565511: Ext4 cannot be mounted in target system, but can be mounted by installer?

["A.E.Lawrence" <lawrence_a_e@ntlworld.com>]

I used the rescue mode of the installer to change the root file system 
type to ext4.

I used

  #tune2fs -O extents,uninit_bg,dir_index /dev/yourfilesystem

That was successful. I could then mount and browse the file system in 
rescue mode.

However when I rebooted back into the target system it reported once 
again that it could not mount root. I was left at the (initramfs) prompt.

I created a mount point /try and tried a whole set of variants of
(intramfs) mount -t ext4 /dev/sda1 /try
The error was "mount: mounting /dev/sda1 on /try failed: no such device"

However, this time /dev/sda1 was in /proc/partitions
and also appeared in all the right places under /dev/sda1, /dev/disk/,,,

So we have the rescue mode of the installer able to mount and handle the 
ext4 volume, but the installed debian squeeze unable to mount it ??

As above, if the partition is ext3, then it can be mounted and all is well?

Not sure where to look in debian bug reports if this is a known ext4 
bug. Will probably google a bit next.

ael