[ndnSIM] Simulation terminated with signal SIGSEGV - possible bug

Thiago Teixeira tteixeira at umass.edu
Sun May 6 04:35:14 PDT 2018


Thanks for your answers. I ran the simulation again and posted the gdb back trace full on the Gist (https://gist.github.com/thiteixeira/8c4fd1deb884b548d1f071ebb1bee043#file-gbd_bt_full_output-txt)

@John, I will try ndnSIM 2.4, thanks.


From: John Baugh [mailto:jpbaugh at umich.edu]
Sent: Saturday, May 5, 2018 6:16 PM
To: Thiago Teixeira <tteixeira at umass.edu>
Cc: ndnsim at lists.cs.ucla.edu
Subject: Re: [ndnSIM] Simulation terminated with signal SIGSEGV - possible bug


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.

I can't reproduce the error, so as Dr. Shi suggested, it would be useful to see your GDB and/or Valgrind output.



On Sat, May 5, 2018 at 9:23 AM, Thiago Teixeira <tteixeira at umass.edu<mailto:tteixeira at umass.edu>> wrote:
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:

#### ndnSIM version

#### 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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