Made some progress today.

On the phone, I am seeing:

/var/lib/apparmor/profiles/click_com.ubuntu.filemanager_filemanager_0.3.275
containing a pathname and all zeros. The start is always on a page
boundary and the end is always on a page boundary.

I copied the entire partition /dev/mmcblk0p23 over adb back to my
laptop, mounted it and then mounted /mnt/ubuntu.img and the same file is
sane and not corrupted.  So the underlying data is OK.

corrupted data contains
/usr/share/click/preinstalled/com.ubuntu.music/1.3.625/apparmor.json

Cannot find any symlinks that would relate to this.

Next step, I'm adding debug into the symlink name to see if this appears
in the corrupt data to verify it is a symlink.

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https://bugs.launchpad.net/bugs/1387214

Title:
  file corruption on touch images in rw portions of the filesystem

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