I just did a clean build on top of the current master (I was building on top of ghc-7.8) and it worked! <br><br><div>Thanks!</div><div>--</div><div>Luís Gabriel</div><br><div class="gmail_quote">On Sun Jan 18 2015 at 9:35:35 AM Sergei Trofimovich &lt;<a href="mailto:slyich@gmail.com">slyich@gmail.com</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sat, 17 Jan 2015 23:20:30 +0000<br>
Luís Gabriel &lt;<a href="mailto:lampih@gmail.com" target="_blank">lampih@gmail.com</a>&gt; wrote:<br>
<br>
&gt; Hi there,<br>
&gt;<br>
&gt; I&#39;m doing some experiments with the GHC time profiler and I need to add a<br>
&gt; new field to the Cost Centre structures. I managed to add the field in the<br>
&gt; *CCS.h* header as well as in *codeGen/StgCmmProf.hs* but for some reason<br>
&gt; the program is crashing during garbage collection.<br>
&gt;<br>
&gt; As I have no experience with the GHC internals, I&#39;m having trouble to find<br>
&gt; the problem. It would be very nice if someone could give me some clue to<br>
&gt; find this bug.<br>
&gt;<br>
&gt; The patch on GHC as well as the test sample and stack traces can be found<br>
&gt; here: <a href="https://gist.github.com/luisgabriel/39d51cf4d661c7e62e22" target="_blank">https://gist.github.com/<u></u>luisgabriel/<u></u>39d51cf4d661c7e62e22</a><br>
<br>
I tried your patch as-is on current ghc-HEAD/amd64 and it works fine.<br>
(might easily be another problem)<br>
<br>
What I am suspicious about is you are using<br>
    &#39;-prof -debug&#39; and plain &#39;ghc&#39;.<br>
<br>
Could it be that you didn&#39;t add<br>
    GhcRTSWays += debug_p<br>
in your <a href="http://build.mk" target="_blank">build.mk</a> after a patch was tweaked last time<br>
and some old runtime against new ghc was used?<br>
<br>
I usually use inplace/bin/ghc-stage2 right<br>
after compilation without installation.<br>
<br>
--<br>
<br>
  Sergei<br>
</blockquote></div>