Just to add info while I am looking through things:

I booted a maverick and a natty amd64 and a maverick i386 instance.
Comparing maverick and natty, one things was the compiler version. To
rule that out I compiled a natty kernel in a maverick chroot and tested
that on a t1.micro. Same fail. So its not that.

The next things I saw but need to figure out how to check for relevance:

In Maverick (i386 and amd64) there is this:
[    0.000000] Scanning 1 areas for low memory corruption
while in natty it says:
[    0.000000] Scanning 0 areas for low memory corruption

There seems also to be a slightly different memory layout but I am not
sure this is just because this is virtualization. There also was one
line in the maverick i386 boot which was different from the amd64 boot:

[    0.000000] Reserving virtual address space above 0xf5800000

This is the very fist line in dmesg, but again, not sure it is relevant.

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natty kernel fails to mount root on ec2
https://bugs.launchpad.net/bugs/669496
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