I am using lammps-daily executable on a Linux machine, and I updated it as per directions on LAMMPS website. I still get the segmentation fault. I have simplified my structure and uploaded relevant files which should be able to help anyone reproduce the segfault. The link is: https://uofi.box.com/s/ac1q4uv9xcugh9ljcq8gzytku5vwu8a9
The file pmmaReax.data currently has the data which produces segmentation fault. It does run for a few time steps though, and the trajectory data can be visualized to see the same.
I get the segfault when I simulate 1 or 3 chains, but the simulation runs fine for 2 chains. You can try this by executing runMoltemplate_2.sh (it simply changes the number of polymer chains in system.lt to 2 from 1 or 3; this may be done manually to check for other cases as well). I have not yet verified suitability of the chosen force field parameters to the polymer I am simulating, this was only for practicing the use of reaxFF. So the numbers may not be correct, and the simulation does not correctly show all the bonds that should be there in a PMMA chain. Please let me know if I can provide any additional information/data that might be of help.
Small note: after running the moltemplate script, you would need to manually delete 4 lines in the beginning of the data file which say 0 bonds, 0 angles, 0 dihedrals and 0 impropers, before running lammps.