The MWE
\documentclass{standalone}
\usepackage{tikz}
\begin{document}
Normal \rotatebox{90}{a} text
\end{document}
causes a segfault on one of my machines (ARM32, musl), but not on the other (AMD64, glibc). Both are using texlive-2017 as packaged by Gentoo (I can give more specific version details if needed, but LaTeX involves an awful lot of versions). Switching to 90.001 is a very easy workaround. Using latex, then dvipdfm, also works as desired.
I figured I should try to report this, please let me know what I can do to narrow this down, if this should be reported somewhere else, if it's already been fixed, &c.
Thanks.
Sorry, I realize now that it's ambiguous what command actually crashes: it's
pdflatex mwe.My apologies, I'm a complete idiot. I've thought that \rotatebox was provided by Tikz for years. I see now this is completely irrelevant.
For details see https://github.com/pgf-tikz/pgf/issues/521