bibtex hangs on some accents

[ejeandel]

The following MWE shows a document on which tectonic fails. Specifically it hangs while bibtexing.

\documentclass{article}
\begin{document}
\cite{buchi}
\bibliographystyle{alpha}
\bibliography{biblio}
\end{document}

The biblio.bib file is:

@Article{buchi,
  author = {Julius Richard B{\"u}chi},
  title = "{Turing-Machines and the Entscheidungsproblem}",
  journal = "Math. Annalen",
  year = "1962",
}

Notes: it doesn't hang if alpha is replaced by plain. It also doesn't hang when B{\"u}chi is replaced by Büchi.

Note: while not hanging, tectonic says "warning: internal consistency problem when checking if xxx.bbl changes", any idea why ?

Thanks,

E.

[CraftSpider]

I think I encountered this as a bug and fixed it in #1163. I'll attempt to extract the fix as a small patch and PR it separately, see if that fixes this issue.