Re: unexelf.c maybe broke between 21.1 and 21.2

[Richard Stallman]

    Unfortunately, when I compare the old and new code, I see no obvious reason
    for it to act any differently,

When you can't tell by reading the code why it fails,
the only thing left is to debug it with a debugger.
If you can debug what the two versions of unexec actually do
differently, you could perhaps fix it.

You could also see how the executable files differ.