Comment # 6 on bug 1190920 from Ludwig Nussel

kdumptool expands the symlink for the kernel image and uses the directory of
where that link points to for the kdump initrd. Not just that, it also looks
for the kernel config in that directory. It can't find it as it's actually
called "config" rather than "config-$kernelversion".

The naive fix would be to not use the canonical path. However seems like
kdumptool also looks at /boot/vmlinuz and that one needs one level of
dereferencing. So needs a bit more insight to how this code is used. Handing
over to kdump maintainers.