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Hi! i'm reporting a bug discovered by Tigran Aivazian: He got this message: pdflatex: ./1016.pdf: Too many open files by running pdflatex on this simple source: \documentclass[pdftex,a5paper]{book} \usepackage[papersize={8.5in,11in}]{geometry} \usepackage{pdfpages} \begin{document} \newcount\i \i=2 \loop \ifnum\i<1725 \includepdf[pages={-}]{\number\i.pdf}% \advance\i by1 \repeat \end{document} It appears that this is due to the "ulimit" on the number of simultaneously opened files which was 1024 by default. Increasing "ulimit" allowed to process the file. But it looks like a bug in pdftex: it seems that it keeps all the files which were \includepdf'ed opened, thus causing this limit to be reached. Instead, it seems, it should close the included files. WDYT? Best, v.