What's wrong with Libertine + MnSymbol + newtxmath?

Question

There's something really wrong with this combination:

\documentclass{article}
\usepackage{libertine}
\usepackage{MnSymbol}
\usepackage[libertine]{newtxmath}

\begin{document}
  sdfsdfsldkfsld skdj sldkf sdsd
\begin{equation}
  \overbrace{p(\theta | x)}^{\text{posterior}} =
  \frac{\overbrace{p(x | \theta)}^{\text{likelihood}}\;
    \overbrace{p(\theta)}^{\text{prior}}}{p(x)},
\end{equation}
\end{document}

Instead of overbraces, some integrals occur:

How do I fix this?

Answer 1

To work together correctly, newtxmath needs to be loaded before MnSymbol:

\usepackage{libertine}
\usepackage[libertine]{newtxmath}
\usepackage{MnSymbol}