Hi,
No time to debug this for now, but I have a reproduction script:
mkdir test && cd test git init sub cd sub/ touch foo && git add . && git commit -m"foo" cd .. git init git add sub rm -fr sub/.git/ cd sub/ git add .
In short, sub used to be a submodule, but we removed the .git/ and tried to "git add ." the result.
The last line triggers this:
git: pathspec.c:317: prefix_pathspec: Assertion `item->nowildcard_len <= item->len && item->prefix <= item->len' failed.
Cheers,
-- Matthieu Moy http://www-verimag.imag.fr/~moy/