I talked with psusi (Phillip Susi) in #ubuntu-devel and he seemed to
have some interesting ideas, unfortunately I had absolutely no idea what
he was talking about (me not knowing the code, or any theory of
filesystems at all), so I though I would post it here for reference by
others.

Main points (edited):

Sounds like an assertion failure triggered by the sigint... search the code for 
that string.
Sounds like the canceling tries to do some cleanup in the SIGINT handler, and 
part of that cleanup is trying to write out the inode allocation bitmap, which 
an assertion check makes sure is actually loaded first and it isn't.
It may not be loaded either because it has not been loaded yet at the time of 
the SIGINT, or because that block group's inode allocation bitmap is 
uninitialized.

First thing I'd do is search the source code for the string "Inode bitmap not 
loaded while"
My guess is you will find an assert() with that string in it and that assertion 
is failing because of a race condition in which the inode allocation bitmap is 
not loaded yet, but should be eventually... and that could be a little tricky 
to fix.

But I have a feeling that probably it is not loaded because that block
group's inode table is uninitialized in the first place.. meaning there
are no inodes used in that block group so the allocation table is not
actually valid and a flag says it is unused, assume it's all empty.

Fixing that should be as simple as putting in a check for the
uninitialized flag in the code trying to flush the allocation bitmap and
bail out of it is set.

/lastlog attached for completeness

** Attachment added: "psusi_fsck_ubuntu-devel_lp582035.txt"
   http://launchpadlibrarian.net/48636353/psusi_fsck_ubuntu-devel_lp582035.txt

** Tags added: lucid

-- 
User cancel of fsck gives: "fsck.ext4: Inode bitmap not loaded while setting 
block group checksum"
https://bugs.launchpad.net/bugs/582035
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