<div dir="ltr">Thiago,<div><br></div><div>I am sorry to ask you to do this, but could you perhaps upgrade your Valgrind and run again if possible? I've been looking into your issue and I found a few places that said Valgrind 3.11.0 doesn't recognize the
<span style="color:rgb(36,41,46);font-family:SFMono-Regular,Consolas,"Liberation Mono",Menlo,Courier,monospace;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:pre;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">random_device::_M_getval()</span> instruction so Valgrind is exiting too soon before it finds the actual problem, in my estimation. The _M_getval is used several calls deep from some of the ndnSIM code, and Valgrind doesn't recognize it, so it's terminating and not giving much useful information.</div><div><br></div><div>Thanks,</div><div><br></div><div>John</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 6, 2018 at 12:58 PM, Thiago Teixeira <span dir="ltr"><<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hi John,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Please find the Valgrind output. I ran both Valgrind leak-check=yes and leak-check=full<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-full-txt" target="_blank">https://gist.github.com/<wbr>thiteixeira/<wbr>8c4fd1deb884b548d1f071ebb1bee0<wbr>43#file-valgrind-leak-check-<wbr>full-txt</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-yes-txt" target="_blank">https://gist.github.com/<wbr>thiteixeira/<wbr>8c4fd1deb884b548d1f071ebb1bee0<wbr>43#file-valgrind-leak-check-<wbr>yes-txt</a><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal">TT<u></u><u></u></p>
<p class="MsoNormal"><a name="m_-6863775557023682009__MailEndCompose"><u></u> <u></u></a></p>
<span></span>
<p class="MsoNormal"><span class=""><b>From:</b> John Baugh [mailto:<a href="mailto:jpbaugh@umich.edu" target="_blank">jpbaugh@umich.edu</a>] <br>
</span><b>Sent:</b> Sunday, May 6, 2018 8:40 AM<br>
<b>To:</b> Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>><br>
<b>Cc:</b> Junxiao Shi <<a href="mailto:shijunxiao@email.arizona.edu" target="_blank">shijunxiao@email.arizona.edu</a>><wbr>; ndnsim <<a href="mailto:ndnsim@lists.cs.ucla.edu" target="_blank">ndnsim@lists.cs.ucla.edu</a>></p><div><div class="h5"><br>
<b>Subject:</b> Re: [ndnSIM] Simulation terminated with signal SIGSEGV - possible bug<u></u><u></u></div></div><p></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Looks like a heap corruption of some sort.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Can we try valgrind?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">This may help:. <a href="http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003991.html" target="_blank">http://www.lists.cs.<wbr>ucla.edu/pipermail/ndnsim/<wbr>2017-July/003991.html</a><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Thanks<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">John<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Sun, May 6, 2018, 7:35 AM Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Hi,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks for your answers. I ran the simulation again and posted the gdb back trace full on the Gist (<a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-gbd_bt_full_output-txt" target="_blank">https://gist.github.com/<wbr>thiteixeira/<wbr>8c4fd1deb884b548d1f071ebb1bee0<wbr>43#file-gbd_bt_full_output-txt</a><wbr>)<u></u><u></u></p>
<p class="MsoNormal"><a name="m_-6863775557023682009_m_-6053537358896988269__MailEndCompose"> </a><u></u><u></u></p>
<p class="MsoNormal">@John, I will try ndnSIM 2.4, thanks.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Best,<u></u><u></u></p>
<p class="MsoNormal">Thiago<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><b>From:</b> John Baugh [mailto:<a href="mailto:jpbaugh@umich.edu" target="_blank">jpbaugh@umich.edu</a>]
<br>
<b>Sent:</b> Saturday, May 5, 2018 6:16 PM<br>
<b>To:</b> Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>><br>
<b>Cc:</b> <a href="mailto:ndnsim@lists.cs.ucla.edu" target="_blank">ndnsim@lists.cs.ucla.edu</a><br>
<b>Subject:</b> Re: [ndnSIM] Simulation terminated with signal SIGSEGV - possible bug<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">Thiago,<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">I was able to run your scenario in ndnSIM 2.4. So I suspect this is either an introduced bug in the simulator itself, or perhaps there's something not correctly configured in your
environment. <u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">I can't reproduce the error, so as Dr. Shi suggested, it would be useful to see your GDB and/or Valgrind output.<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">Thanks!<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">John<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">On Sat, May 5, 2018 at 9:23 AM, Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Hi all,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">We have a scenario where nodes have two interfaces, one wireless and one wired. Nodes are position on a grid fashion and the producer is located in the center of the grid.<u></u><u></u></p>
<p class="MsoNormal">We run this scenario for 4,000 seconds, but the simulation ends at 2,099 seconds with the code
<u></u><u></u></p>
<p class="MsoNormal"> Command ['/home/vagrant/ndnSIM/ns-3/<wbr>build/scratch/ndn-debug-<wbr>scenario'] terminated with signal SIGSEGV. Run it under a debugger to get more information (./waf --run <program>
--command-template="gdb --args %s <args>").<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Running with GDB didn’t offer any other insights. Here are the steps to reproduce the issue:<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">#### Expected behavior<u></u><u></u></p>
<p class="MsoNormal">Simulations run until the specified time Simulator::Stop(Seconds(4000.<wbr>0));<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">#### Actual behavior<u></u><u></u></p>
<p class="MsoNormal">Simulations crash (see error message below) before Simulator::Stop(Seconds(4000.<wbr>0));<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">`Command ['/home/vagrant/ndnSIM/ns-3/<wbr>build/scratch/ndn-debug-<wbr>scenario'] terminated with signal SIGSEGV. Run it under a debugger to get more information (./waf --run <program> --command-template="gdb
--args %s <args>").`<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">#### Code to reproduce the problem<u></u><u></u></p>
<p class="MsoNormal">See Gist:<u></u><u></u></p>
<p class="MsoNormal"><a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043" target="_blank">https://gist.github.com/<wbr>thiteixeira/<wbr>8c4fd1deb884b548d1f071ebb1bee0<wbr>43</a><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">#### ndnSIM version<u></u><u></u></p>
<p class="MsoNormal">ndnSIM-2.5-2-ge674a01<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">#### Operating system and version<u></u><u></u></p>
<p class="MsoNormal">Ubuntu 16.04.4 LTS<u></u><u></u></p>
<p class="MsoNormal">memory size: 2000MiB<u></u><u></u></p>
<p class="MsoNormal">1 cpu: Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">#### Other relevant information<u></u><u></u></p>
<p class="MsoNormal">compiled ndnSIM using the optimized version:<u></u><u></u></p>
<p class="MsoNormal">./waf configure -d optimized<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Increasing the number of nodes makes the simulation crash at an earlier time.<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
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<p class="MsoNormal"> <u></u><u></u></p>
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