<p>Looking more at the code and the output, I think this is just a non de-scheduling aware test</p>
<pre><code>main(): This is RIOT! (Version: buildtest)
START
start
d3 (prio=8): sleep for     6423 µs.
start
d4 (prio=8): sleep for    46739 µs.
start
start
start
start
starr3 (prio=8): 0: read  <-  0 (correct = 1)
d3 (prio=8): sleep for    12174 µs.
prstart
r4 (prio=8): 0: read  <-  0 (correct = 1)
d4 (prio=8): sleep for    99314 µs.
d8 (prio=8): sleep for   225078 µs.
w8 (prio=8): 0: write ->  1 (correct = 1)
d8 (prio=8): sleep for   127208 µs.
d3 (prio=8): sleep for    41928 µs.
d4 (prio=8): sleep for     4969 µs.
d5 (prio=9): sleep for    29410 µs.
</code></pre>

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