Calctex does not render latex fragments, blocks Emacs

[karthink]

I'm running Calctex on Emacs 27.1 on Arch Linux.

1. I start calc (C-x * c)
2. type in some input (sin(x), shows up in latex display mode as \sin{x})
3. M-x calctex-mode
4. Calctex prints a message to the echo area: Rendering LaTeX: \begin{align*} \sin{x} \end{align*}
5. Nothing happens. Emacs input is blocked unless I hit C-g C-g C-g.

I did some debugging:

1. I have compiled the dvichop binary and set the correct paths for calctex-dvichop-sty and calctex-dvichop-bin.
2. The function cacltex-texd-render-process is called, but remains indefinitely in the loop

      (while (not (or calctex-latex-success calctex-latex-error))
        (accept-process-output calctex-latex-proc 0.1))

so calctex-accept-latex-output does not report a success (calctex-latex-success) or an error (calctex-latex-error).

I also did the following:

1. Copy all the preamble and main body code from the functions calctex-setup-texd, calctex-texd-render-process and calctex--texd-shipout-page to a test file.
2. Add an \end{document} to the test file.
3. Run latex -jobname calctex test_file.tex in a terminal. This produces no errors, but a four page dvi. My \sin{x} is rendered on page 3, the other pages are blank. My texlive distribution is not missing any of the required packages.

Here are the contents of *CalcTeX Log*:

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entering extended mode
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And here are the contents of the log file referred to above.