<p>So, there was a  thread from March 2017 explaining the pitfalls in <code>primitiveSignalAtMilliseconds</code>:</p>
<blockquote>
<p>Re: [Vm-dev] We need help from VM experts. Re: Freeze after Morph Activity<br>
<a href="http://lists.squeakfoundation.org/pipermail/vm-dev/2017-March/024381.html" rel="nofollow">http://lists.squeakfoundation.org/pipermail/vm-dev/2017-March/024381.html</a></p>
</blockquote>
<p>In particular, all was said here: the rollover workaround is <strong>HIGHLY suspiscious</strong>:<br>
<a href="http://lists.squeakfoundation.org/pipermail/vm-dev/2017-March/024410.html" rel="nofollow">http://lists.squeakfoundation.org/pipermail/vm-dev/2017-March/024410.html</a></p>
<p>So we solved it, or IMO we didn't solve, just patched:<br>
<a href="http://lists.squeakfoundation.org/pipermail/vm-dev/2017-March/024438.html" rel="nofollow">http://lists.squeakfoundation.org/pipermail/vm-dev/2017-March/024438.html</a></p>
<p>As I later reminded, there were still problems:<br>
<a href="http://lists.squeakfoundation.org/pipermail/vm-dev/2017-May/025160.html" rel="nofollow">http://lists.squeakfoundation.org/pipermail/vm-dev/2017-May/025160.html</a></p>
<p>But our attention was focused on more important developments (spur,win64 etc...) and we patched and replaced <code>usqLong deltaMsecs</code> by <code>sqLong deltaMsecs</code>, about 1 year after 1st problem:<br>
<a href="http://lists.squeakfoundation.org/pipermail/vm-dev/2018-March/027041.html" rel="nofollow">http://lists.squeakfoundation.org/pipermail/vm-dev/2018-March/027041.html</a></p>
<p>The compiler warning disappeared, but we kept the rollover that I once suggested to remove!<br>
We eliminate all smells of the problem, but not really the problem itself, that remain burried and quiet for some times (that's expected, squeak.cog.v3 might be used occasionally or less).<br>
I'm ready to bet a few hundred $ that we can can still trigger a problem in cog.v3 as Juan did once, and that our CI failures are related. I haven't got an old image handy near this keyboard, but if anyone wants to try this in a squeak.cog.v3, and watchout what the console delivers:</p>
<pre><code>s := Semaphore new.
Delay primSignal: s atMilliseconds: Time primMillisecondClock - 2.
s wait.
</code></pre>

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