[ndnSIM] Simulation terminated with signal SIGSEGV - possible bug

[Thiago Teixeira]

Hi all,

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.
We run this scenario for 4,000 seconds, but the simulation ends at 2,099 seconds with the code
    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>").

Running with GDB didn't offer any other insights. Here are the steps to reproduce the issue:

#### Expected behavior
Simulations run until the specified time Simulator::Stop(Seconds(4000.0));

#### Actual behavior
Simulations crash (see error message below) before Simulator::Stop(Seconds(4000.0));

`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>").`

#### Code to reproduce the problem
See Gist:
https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043

#### ndnSIM version
ndnSIM-2.5-2-ge674a01

#### Operating system and version
Ubuntu 16.04.4 LTS
memory size: 2000MiB
1 cpu: Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz

#### Other relevant information
compiled ndnSIM using the optimized version:
./waf configure -d optimized

Increasing the number of nodes makes the simulation crash at an earlier time.
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