<p>Note, it currently is the only <code>unittests</code>  remaining failing test:</p>
<pre><code>2019-07-23 13:32:21,764 - INFO # main(): This is RIOT! (Version: 2019.10-devel-109-gb1bab)
2019-07-23 13:32:21,767 - INFO # .........................................................................................................................................................................................................
2019-07-23 13:32:21,768 - INFO # pkt_tests.sfprintf_float (tests/unittests/tests-printf_float/tests-printf_float.c 40) exp "2016.034900" was "-0.000000"
2019-07-23 13:33:25,269 - INFO # ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
2019-07-23 13:33:25,270 - INFO # run 945 failures 1
</code></pre>
<p>And when changing:</p>
<div class="highlight highlight-source-diff"><pre><span class="pl-c1">diff --git a/core/kernel_init.c b/core/kernel_init.c</span>
index 1b153b38a..bb61c5dd9 100644
<span class="pl-md">--- a/core/kernel_init.c</span>
<span class="pl-mi1">+++ b/core/kernel_init.c</span>
<span class="pl-mdr">@@ -74,7 +74,7 @@</span> static void *idle_thread(void *arg)
 const char *main_name = "main";
 const char *idle_name = "idle";

<span class="pl-md"><span class="pl-md">-</span>static char main_stack[THREAD_STACKSIZE_MAIN];</span>
<span class="pl-mi1"><span class="pl-mi1">+</span>static char main_stack[THREAD_STACKSIZE_MAIN] = {0xff};</span>
 static char idle_stack[THREAD_STACKSIZE_IDLE];

 void kernel_init(void)</pre></div>
<p>it works.</p>
<p>Some otherĀ <code>printf</code> cases work:</p>
<pre><code>ssh -t vaduz.imp.fu-berlin.de 'source /srv/ilab-builds/workspace/workspace.rc && BOARD=msba2 QUIET=0 make --no-print-directory -C /srv/ilab-builds/boards term'
/srv/ilab-builds/boards/RIOT/dist/tools/pyterm/pyterm -tg -p "/dev/riot/ttyMSBA2"
Twisted not available, please install it if you want to use pyterm's JSON capabilities
2019-07-23 13:44:07,605 - INFO # Connect to serial port /dev/riot/ttyMSBA2
Welcome to pyterm!
Type '/exit' to exit.
2019-07-23 13:44:08,609 - INFO # main(): This is RIOT! (Version: 2019.10-devel-109-gb1bab)
2019-07-23 13:44:08,609 - INFO # Hello World!
2019-07-23 13:44:08,610 - INFO # You are running RIOT on a(n) msba2 board.
2019-07-23 13:44:08,610 - INFO # This board features a(n) lpc2387 MCU.
2019-07-23 13:44:08,611 - INFO # What is the approximate value of Pi: 3.141593
2019-07-23 13:44:08,611 - INFO # What is the float answer: 42.000000
</code></pre>

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