<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi guys,</div><div><br></div><div>I'm trying to use Valgrind to track memory leaks in C NIF/Linkedin drivers.</div><div>For this, I've built a "Debug Enabled" ERTS with Valgrind and SMP flavor:</div><div><a href="http://www.erlang.org/doc/installation_guide/INSTALL.html">http://www.erlang.org/doc/installation_guide/INSTALL.html</a></div><div><br></div><div>1/ First attempt: start an Erlang node and turn it off immediately:</div><div><br></div><div>$ cerl -valgrind</div><div>[...]</div><div><br></div><div>1> init:stop().</div><div><br></div><div>[...]</div><div><div><div>==61127== at 0xC713: malloc (vg_replace_malloc.c:274)</div><div>==61127== by 0x1002C25F0: erts_sys_alloc (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==61127== by 0x10000B6B3: erts_alloc (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==61127== by 0x10000B5AC: erts_alloc_permanent_cache_aligned (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==61127== by 0x1001053E7: init_db (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==61127== by 0x10002884B: erl_init (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==61127== by 0x10002D273: erl_start (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==61127== by 0x10000191F: main (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==61127== </div><div>==61127== ERROR SUMMARY: 420 errors from 13 contexts (suppressed: 0 from 0)</div></div></div><div><br></div><div>420 errors reported.</div><div><br></div><div>Rickard Green explained why Valgrind reported these (false) numbers at:</div><div><a href="http://erlang.org/pipermail/erlang-questions/2010-February/049591.html">http://erlang.org/pipermail/erlang-questions/2010-February/049591.html</a></div><div><br></div><div><div><br></div><div>2/ Second attempt: simply load "crypto" module and stop it:</div></div><div><br></div><div>$ cerl -valgrind</div><div>[...]</div><div><br></div><div>1> crypto:start().</div><div>2> crypto:stop(). </div><div>ok</div><div>3> </div><div>=INFO REPORT==== 17-Mar-2013::10:18:26 ===</div><div> application: crypto</div><div> exited: stopped</div><div> type: temporar</div><div>4> init:stop().</div><div><br></div><div>[...]</div><div><div>==59400== at 0xC713: malloc (vg_replace_malloc.c:274)</div><div>==59400== by 0x1002C25F0: erts_sys_alloc (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==59400== by 0x10000B6B3: erts_alloc (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==59400== by 0x10000B5AC: erts_alloc_permanent_cache_aligned (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==59400== by 0x1001053E7: init_db (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==59400== by 0x10002884B: erl_init (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==59400== by 0x10002D273: erl_start (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==59400== by 0x10000191F: main (in /opt/r16b/usr/lib/erlang/erts-5.10.1/bin/beam.valgrind.smp)</div><div>==59400== </div><div>==59400== ERROR SUMMARY: 460 errors from 15 contexts (suppressed: 0 from 0)</div></div><div><br></div><div>Valgrind now reorts 460 errors instead of 420 (see above).</div><div><br></div><div>I know, there's no memory leak in "crypto" ... but this doesn't help at all. Completely useless.</div><div><br></div><div>So, my question is very simple: </div><div>How Valgrind can help me to track memory leaks in my own NIF/linked-in drivers then?</div><div>How can I distinguish between these falsy reported numbers and the real ones?</div><div><br></div><div>Finally, is there any other way than Valgrind?</div><div><br></div><div apple-content-edited="true">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Regards,</div><div>Zabrane</div><div><br></div></div></div><br class="Apple-interchange-newline">
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