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<p class="MsoNormal">Hi John,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please find my answers below in red. As Junxiao pointed out, we are trying to run our scenario with more memory (32 GB).<o:p></o:p></p>
<p class="MsoNormal">We will let you know how it goes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Thiago<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a name="_MailEndCompose"><o:p> </o:p></a></p>
<span style="mso-bookmark:_MailEndCompose"></span>
<p class="MsoNormal"><b>From:</b> John Baugh [mailto:jpbaugh@umich.edu] <br>
<b>Sent:</b> Saturday, May 19, 2018 5:38 AM<br>
<b>To:</b> Thiago Teixeira <tteixeira@umass.edu><br>
<b>Cc:</b> Junxiao Shi <shijunxiao@email.arizona.edu>; ndnsim <ndnsim@lists.cs.ucla.edu>; Rajvardhan <rdeshmukh@umass.edu><br>
<b>Subject:</b> Re: [ndnSIM] Simulation terminated with signal SIGSEGV - possible bug<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thiago,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I keep coming back to this when I get free time, and it's still a bit perplexing. Is the ndn-debug-scenario.cc that you have at <a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-full-txt">https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-full-txt</a>
up to date? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:red">Yes, that is the code we are using to debug this issue, because it has only a few modifications from the ndn-simple-wifi scenario.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The Valgrind points to line 195 as being the culprit, but that's just setting a prefix (
<span style="font-size:9.0pt;font-family:Consolas;color:#24292E;background:white">
producerHelper.</span><span class="gmail-pl-c1"><span style="font-size:9.0pt;font-family:Consolas;color:#005CC5;background:white">SetPrefix</span></span><span style="font-size:9.0pt;font-family:Consolas;color:#24292E;background:white">(ndnPrefix);)</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">Some things we can at least look into:</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l0 level1 lfo1">
What version of the C standard library is installed on your system? (ldd --version)<o:p></o:p></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><span style="color:red">$ ldd –version<br>
ldd (Ubuntu GLIBC 2.23-0ubuntu10) 2.23<o:p></o:p></span></p>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l0 level1 lfo1">
When you said "ndnSIM 2.4 didn't work for us", did you mean you couldn't install ndnSIM 2.4, or you did install it and it still doesn't work?<o:p></o:p></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><span style="color:red">We were able to install ndnSIM 2.4 by cloning ndnSIM 2.5, checking the ndnSIM 2.4 tag, running “git submodule update --init". But the code in that Gist only runs
for a few seconds (Raj has more memory and his simulation run for a bit longer).<o:p></o:p></span></p>
<ol start="3" type="1">
<li class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l0 level1 lfo1">
Deep in the belly of ns-3 (<a href="https://www.nsnam.org/doxygen/simple-ref-count_8h_source.html#l00105">https://www.nsnam.org/doxygen/simple-ref-count_8h_source.html#l00105</a>) - it appears there is an m_count variable, but it's an unsigned 32 bit integer...
not 64 bit. So I'm wondering if the number of references it's tracking exceeds <span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">4,294,967,295. </span> <o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
Alternatively, the problem most clearly (unclearly?) says it's " <o:p></o:p></li></ol>
<pre style="margin-left:.5in;text-indent:0in;mso-list:l0 level1 lfo1;background:white"><![if !supportLists]><span style="font-size:10.5pt;color:black"><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="font-size:10.5pt;color:black">Address 0x8 is not stack'd, malloc'd or (recently) free'd<o:p></o:p></span></pre>
<pre style="margin-left:.5in;text-indent:0in;mso-list:l0 level1 lfo1;background:white"><![if !supportLists]><span style="font-size:10.5pt;color:black"><span style="mso-list:Ignore">6.<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></pre>
<pre style="margin-left:.5in;background:white"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">and</span><span style="font-size:10.5pt;color:black"><o:p></o:p></span></pre>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier New";color:black">==1647== Process terminating with default action of signal 11 (SIGSEGV) ==1647== Access not within mapped region at address 0x8</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier New";color:black"><br>
</span>So I'm wondering... where is this 0x8 address having a value assigned or being accessed? 0x8 doesn't seem to be a likely memory address to be allocated... so a pointer is being set to the value "8" somewhere.... I don't see you doing that anywhere.
So I'm wondering if there's a buffer overflow somewhere.<span style="font-size:10.5pt;font-family:"Courier New";color:black">
</span><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"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">Thanks,</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222;background:white">John</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, May 16, 2018 at 5:10 PM, Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi John,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I added more memory when I upgraded to the latest Valgrind version. This test was run with 4GB of memory on the VM. My colleague also performed the same test on a VM with 8GB, same
result.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Is there any other test that we can run? (ndnSIM 2.4 didn’t work for us)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thiago<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="m_3458002992727898148__MailEndCompose"> </a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>From:</b> John Baugh [mailto:<a href="mailto:jpbaugh@umich.edu" target="_blank">jpbaugh@umich.edu</a>]
<br>
<b>Sent:</b> Wednesday, May 16, 2018 3:53 PM<br>
<b>To:</b> Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>><o:p></o:p></p>
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<p class="MsoNormal"><br>
<b>Cc:</b> Junxiao Shi <<a href="mailto:shijunxiao@email.arizona.edu" target="_blank">shijunxiao@email.arizona.edu</a>>; ndnsim <<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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thiago,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">My best estimate is this based on valgrind: your simulation is using almost 900 MB of memory, and your system only has 2.0 GB. I think by the time it gets to 2,000 or so seconds,
you simply are running out of memory and there's a SIGSEGV. You'll probably need more memory in this system, or to use a more powerful system. Under HEAP SUMMARY, it says
<o:p></o:p></p>
<pre style="background:white"><span style="font-size:10.5pt;color:black"> in use at exit: <b>897,122,422</b> bytes in 7,147,817 blocks</span><o:p></o:p></pre>
<pre style="background:white"><span style="font-size:10.5pt;color:black">==1647== total heap usage: 40,377,629,822 allocs, 40,370,482,008 frees, 4,349,761,010,258 bytes allocated</span><o:p></o:p></pre>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I assume with the OS, other apps running, and the simulator, it's just too much for the device you're on.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks!<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">John<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Wed, May 16, 2018 at 10:18 AM, Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi John,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The Valgrind (version 3.13) test ended. Please see output attached. I also posted
<a href="https://umass.box.com/s/s9qql8vo1kjy170qm8ijxcm6181ioip4" target="_blank">
here</a> for future reference.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Please let me know is there’s something else I can do.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thiago<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="m_3458002992727898148_m_7247890011309502"> <o:p></o:p></a></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><b>From:</b> John Baugh [mailto:</span><a href="mailto:jpbaugh@umich.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">jpbaugh@umich.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">]
<br>
<b>Sent:</b> Monday, May 7, 2018 4:02 AM<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><br>
<b>To:</b> Thiago Teixeira <</span><a href="mailto:tteixeira@umass.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">tteixeira@umass.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">><br>
<b>Cc:</b> Junxiao Shi <</span><a href="mailto:shijunxiao@email.arizona.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">shijunxiao@email.arizona.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">>;
ndnsim <</span><a href="mailto:ndnsim@lists.cs.ucla.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">ndnsim@lists.cs.ucla.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">><br>
<b>Subject:</b> Re: [ndnSIM] Simulation terminated with signal SIGSEGV - possible bug<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Thiago,<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">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><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><span style="font-size:9.0pt;font-family:Consolas;color:#24292E;background:white">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.<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">John<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">On Sun, May 6, 2018 at 12:58 PM, Thiago Teixeira <</span><a href="mailto:tteixeira@umass.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">tteixeira@umass.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">>
wrote:<o:p></o:p></span></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Hi John,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Please find the Valgrind output. I ran both Valgrind leak-check=yes and leak-check=full<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span><a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-full-txt" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-full-txt</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span><a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-yes-txt" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-valgrind-leak-check-yes-txt</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">TT<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><b>From:</b> John Baugh [mailto:</span><a href="mailto:jpbaugh@umich.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">jpbaugh@umich.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">]
<br>
<b>Sent:</b> Sunday, May 6, 2018 8:40 AM<br>
<b>To:</b> Thiago Teixeira <</span><a href="mailto:tteixeira@umass.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">tteixeira@umass.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">><br>
<b>Cc:</b> Junxiao Shi <</span><a href="mailto:shijunxiao@email.arizona.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">shijunxiao@email.arizona.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">>;
ndnsim <</span><a href="mailto:ndnsim@lists.cs.ucla.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">ndnsim@lists.cs.ucla.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><br>
<b>Subject:</b> Re: [ndnSIM] Simulation terminated with signal SIGSEGV - possible bug<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Looks like a heap corruption of some sort.<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Can we try valgrind?<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">This may help:. </span><a href="http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003991.html" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">http://www.lists.cs.ucla.edu/pipermail/ndnsim/2017-July/003991.html</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Thanks<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">John<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">On Sun, May 6, 2018, 7:35 AM Thiago Teixeira <</span><a href="mailto:tteixeira@umass.edu" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">tteixeira@umass.edu</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">>
wrote:<o:p></o:p></span></p>
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<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Hi,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">Thanks for your answers. I ran the simulation again and posted the gdb back trace full on the Gist (</span><a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-gbd_bt_full_output-txt" target="_blank"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-gbd_bt_full_output-txt</span><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"></span></a><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502">)<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="mso-bookmark:m_3458002992727898148_m_7247890011309502"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">@John, I will try ndnSIM 2.4, thanks.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thiago<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><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<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thiago,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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. <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I can't reproduce the error, so as Dr. Shi suggested, it would be useful to see your GDB and/or Valgrind output.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks!<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">John<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Sat, May 5, 2018 at 9:23 AM, Thiago Teixeira <<a href="mailto:tteixeira@umass.edu" target="_blank">tteixeira@umass.edu</a>> wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi all,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We run this scenario for 4,000 seconds, but the simulation ends at 2,099 seconds with the code
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Command ['/home/vagrant/ndnSIM/ns-3/build/scratch/ndn-debug-scenario'] terminated with signal SIGSEGV. Run it under a debugger to get more information (./waf --run <program>
--command-template="gdb --args %s <args>").<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Running with GDB didn’t offer any other insights. Here are the steps to reproduce the issue:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#### Expected behavior<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simulations run until the specified time Simulator::Stop(Seconds(4000.0));<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#### Actual behavior<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simulations crash (see error message below) before Simulator::Stop(Seconds(4000.0));<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">`Command ['/home/vagrant/ndnSIM/ns-3/build/scratch/ndn-debug-scenario'] terminated with signal SIGSEGV. Run it under a debugger to get more information (./waf --run <program> --command-template="gdb
--args %s <args>").`<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#### Code to reproduce the problem<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">See Gist:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043" target="_blank">https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043</a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#### ndnSIM version<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">ndnSIM-2.5-2-ge674a01<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#### Operating system and version<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ubuntu 16.04.4 LTS<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">memory size: 2000MiB<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">1 cpu: Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#### Other relevant information<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">compiled ndnSIM using the optimized version:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">./waf configure -d optimized<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Increasing the number of nodes makes the simulation crash at an earlier time.<o:p></o:p></p>
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_______________________________________________<br>
ndnSIM mailing list<br>
<a href="mailto:ndnSIM@lists.cs.ucla.edu" target="_blank">ndnSIM@lists.cs.ucla.edu</a><br>
<a href="http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim" target="_blank">http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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