<p></p>
<p>Hey, I just discovered that that stacktrace shows the program hanging in exactly the same way as (one of the problems in) bug <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="581259660" data-permission-text="Title is private" data-url="https://github.com/ohrrpgce/ohrrpgce/issues/974" data-hovercard-type="issue" data-hovercard-url="/ohrrpgce/ohrrpgce/issues/974/hovercard" href="https://github.com/ohrrpgce/ohrrpgce/issues/974">#974</a>: in <code>read</code> called inside FB's <code>console_resize</code> interrupt handler called during a <code>waitpid</code> called by <code>fb_Shell</code> (FB's <code>SHELL</code> function). And a commonality between these two bug reports seems to be that Custom was run from a console.</p>
<p>This was a FB bug. Looking at FB's changelog for version 1.00 (formerly version 0.91) shows<br>
<code>- On Linux/*BSD, shell(), exec(), run(), chain(), dylibload(), dylibunload() weren't thread-safe (due to Unix rtlib's console I/O handling)</code></p>
<p>Also, I have since rewritten <code>ISDIR</code> so it doesn't call SHELL anyway.</p>

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