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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Zeus,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We’re really bad with reclaiming memory, but I didn’t know it was that bad! Honestly, there’s no good reason I can see for our heap being that broken. From
the quick glance through the code (lib/c/src/malloc.c) my guess is that either the x86_64-specific hack to avoid freeing memory allocated on another core is firing incorrectly, or lesscore() is firing and doing something dumb. Could you check which it is?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m CCing Simon, who should know more about the workings of lesscore().<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Andrew<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Zeus Gómez Marmolejo [mailto:zeus.gomez@bsc.es]
<br>
<b>Sent:</b> Wednesday, 21 September, 2011 6:14<br>
<b>To:</b> barrelfish-users@lists.inf.ethz.ch<br>
<b>Subject:</b> [Barrelfish-users] Bug in malloc()/free() ?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Here I introduce you a pretty simple program:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">int main(int argc, char **argv)<o:p></o:p></p>
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<p class="MsoNormal">{<o:p></o:p></p>
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<p class="MsoNormal"> void *p;<o:p></o:p></p>
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<p class="MsoNormal"> int i;<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> for(i=0; ;i++)<o:p></o:p></p>
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<p class="MsoNormal"> {<o:p></o:p></p>
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<p class="MsoNormal"> p = malloc(65536);<o:p></o:p></p>
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<p class="MsoNormal"> if (p==NULL)<o:p></o:p></p>
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<p class="MsoNormal"> USER_PANIC("malloc() returned NULL at %d", i);<o:p></o:p></p>
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<p class="MsoNormal"> free (p);<o:p></o:p></p>
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<p class="MsoNormal"> }<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> return 0;<o:p></o:p></p>
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<p class="MsoNormal">}<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This is ALWAYS aborting as:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">ERROR: myapp.0 in morecore_alloc() ../barrelfish/lib/barrelfish/morecore.c:85<o:p></o:p></p>
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<p class="MsoNormal">ERROR: vspace_mmu_aware_map fail<o:p></o:p></p>
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<p class="MsoNormal">Failure: ( libbarrelfish) Out of space in vspace_mmu_aware_map() function [LIB_ERR_VSPACE_MMU_AWARE_NO_SPACE]<o:p></o:p></p>
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<p class="MsoNormal">myapp.0 in main() ../barrelfish/usr/tests/myapp/myapp.c:12<o:p></o:p></p>
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<p class="MsoNormal">malloc() returned NULL at 16382<o:p></o:p></p>
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<p class="MsoNormal">Aborted<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">With the latest Barrelfish tree. Are you aware of this?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">-- <br>
Zeus Gómez Marmolejo<br>
Barcelona Supercomputing Center<br>
PhD student<br>
<a href="http://www.bsc.es" target="_blank">http://www.bsc.es</a><br>
<br>
<o:p></o:p></p>
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