Description of problem:
automatic format generation (mktexfmt, which is just a symlink to fmtutil these
days) can easily get into in infinite loop and fork new and new processes.
It should abort with an error.

Version-Release number of selected component (if applicable):
texlive-2007-16.fc9

To Reproduce:
# mv /usr/share/texmf/tex/latex/latexconfig/latex.ini{,.hide}
# rm /var/lib/texmf/web2c/pdftex/{xml,la}tex.fmt
# fmtutil-sys --byfmt xmltex 2>&1|less

The output looks like this:

fmtutil: running `pdftex -ini   -jobname=xmltex -progname=xmltex &latex
xmltex.ini' ...
This is pdfTeXk, Version 3.141592-1.40.3 (Web2C 7.5.6) (INITEX)
 %&-line parsing enabled.
kpathsea: Running mktexfmt latex.fmt
Sorry, I can't find the format `latex.fmt'; will try `xmltex.fmt'.
kpathsea: Running mktexfmt xmltex.fmt
fmtutil: running `pdftex -ini   -jobname=xmltex -progname=xmltex &latex
xmltex.ini' ...

Observe that the last verse of the song is exactly the same as the first one:
yes, we are there.

Expected results:
The script should display some politically ioncorrect sentences to express
clearly that it does not feel happy ... and then _quit_.