[ndnSIM] Help: A SIGSEGV error in ndnSIM fib entry

[Alex Afanasyev]

Hi Kevin,

I tried to put

      std::cerr << metricFace.GetRoutingCost() << std::endl;
      
into DoPropagateInterest and then run ndn-simple scenario.  I got no errors or segfaults.

GetStatus/GetRoutingCost are the same type of the calls, accessing the same data structure in the same way.  So, not sure why you're getting the segfault.

---
Alex

On Dec 8, 2013, at 7:26 PM, xuxux2006 at 126.com wrote:

> Hi Alex, Ilya and every ndnSIM users,
> I found a problem in ndn-fib-entry.h. When I called the founction GetRoutingCost() of  ndn-fib-entry.h in DoPropagateInterest of flooding.cc , I caught a SIGSEGV error. I did this just as previous calling GetStatus() in  flooding.cc.  The bt result of gdb about this error is listed below:
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> #0  0xb4be06d4 in std::string::begin() () from /usr/lib/i386-linux-gnu/libstdc++.so.6
> #1  0xb677dcb2 in boost::range_detail::range_begin<std::string> (c=...) at /usr/include/boost/range/begin.hpp:49
> #2  0xb677d737 in boost::range_adl_barrier::begin<std::string> (r=...) at /usr/include/boost/range/begin.hpp:108
> #3  0xb677cf61 in boost::iterator_range_detail::iterator_range_impl<__gnu_cxx::__normal_iterator<char*, std::string> >::adl_begin<std::string> (r=...) at /usr/include/boost/range/iterator_range_core.hpp:56
> #4  0xb677c91e in boost::iterator_range<__gnu_cxx::__normal_iterator<char*, std::string> >::iterator_range<std::string> (
>     this=0xbfffe010, r=...) at /usr/include/boost/range/iterator_range_core.hpp:204
> #5  0xb677be9f in boost::make_iterator_range<std::string> (r=...) at /usr/include/boost/range/iterator_range_core.hpp:556
> #6  0xb677b2c4 in boost::range_detail::make_range<std::string> (r=...) at /usr/include/boost/range/as_literal.hpp:93
> #7  0xb677a4ee in boost::as_literal<std::string> (r=...) at /usr/include/boost/range/as_literal.hpp:102
> #8  0xb6779663 in boost::algorithm::iter_split<std::vector<std::string, std::allocator<std::string> >, std::string, boost::algorithm::detail::token_finderF<boost::algorithm::detail::is_any_ofF<char> > > (Result=..., Input=..., Finder=...)
>     at /usr/include/boost/algorithm/string/iter_find.hpp:153
> #9  0xb677882f in boost::algorithm::split<std::vector<std::string, std::allocator<std::string> >, std::string, boost::algorithm::detail::is_any_ofF<char> > (Result=..., Input=..., Pred=..., eCompress=boost::algorithm::token_compress_off)
>     at /usr/include/boost/algorithm/string/split.hpp:149
> #10 0xb67768f8 in ns3::ndn::ConsumerCbr::SendPacket (this=0x8390390) at ../src/ndnSIM/apps/ndn-consumer-cbr.cc:229
> #11 0xb67779a9 in ns3::EventMemberImpl0::Notify (this=0x84fb408) at ./ns3/make-event.h:96
> #12 0xb5035e4b in ns3::EventImpl::Invoke (this=0x84fb408) at ../src/core/model/event-impl.cc:45
> #13 0xb5039f88 in ns3::DefaultSimulatorImpl::ProcessOneEvent (this=0x809a380) at ../src/core/model/default-simulator-impl.cc:138
> #14 0xb503a1a8 in ns3::DefaultSimulatorImpl::Run (this=0x809a380) at ../src/core/model/default-simulator-impl.cc:193
> #15 0xb5036c51 in ns3::Simulator::Run () at ../src/core/model/simulator.cc:160
> #16 0x08059c3f in main (argc=2, argv=0xbffff184) at ../src/ndnSIM/examples/ndn-tree-cs-tracers.cc:473
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>  
> I am confused, why the GetStatus() can be called here but the GetRoutingCost() can not?
> Please help. I have tried several times, but still have this problem. Look forward your help.
> Thanks & Regards
> Kevin Xu
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> ndnSIM at lists.cs.ucla.edu
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