error: Segmentation fault

Dear Dr. Axel,

I am getting the following error frequently.

Dear Dr. Axel,

I am getting the following error frequently.
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[home18:21954] *** Process received signal ***
[home18:21954] Signal: Segmentation fault (11)
[home18:21954] Signal code: Address not mapped (1)
[home18:21954] Failing at address: 0x201a63720
[home18:21954] [ 0] /lib64/libpthread.so.0 [0x315840e7c0]
[home18:21954] [ 1]
/home/lammps-5Mar12/src/lmp_openmpi(_ZN9LAMMPS_NS8Neighbor9bin_atomsEv+0x2a6)
[0x6c7b48]
[home18:21954] [ 2]
/home/lammps-5Mar12/src/lmp_openmpi(_ZN9LAMMPS_NS8Neighbor15half_bin_newtonEPNS_9NeighListE+0x1e)
[0x6d810c]
[home18:21954] [ 3]
/home/lammps-5Mar12/src/lmp_openmpi(_ZN9LAMMPS_NS8Neighbor5buildEv+0x49a)
[0x6cb9d8]
[home18:21954] [ 4]
/home/lammps-5Mar12/src/lmp_openmpi(_ZN9LAMMPS_NS6Verlet3runEi+0x228)
[0x834bc6]
[home18:21954] [ 5]
/home/lammps-5Mar12/src/lmp_openmpi(_ZN9LAMMPS_NS3Run7commandEiPPc+0x77d)
[0x8065c1]
[home18:21954] [ 6]
/home/lammps-5Mar12/src/lmp_openmpi(_ZN9LAMMPS_NS5Input15execute_commandEv+0x111b)
[0x691d07]
[home18:21954] [ 7]
/home/lammps-5Mar12/src/lmp_openmpi(_ZN9LAMMPS_NS5Input4fileEv+0x2b3)
[0x693537]
[home18:21954] [ 8] /home/lammps-5Mar12/src/lmp_openmpi(main+0x5f)
[0x6a11fb]
[home18:21954] [ 9] /lib64/libc.so.6(__libc_start_main+0xf4) [0x315781d994]
[home18:21954] [10]
/home/lammps-5Mar12/src/lmp_openmpi(__gxx_personality_v0+0x341) [0x474899]
[home18:21954] *** End of error message ***
mpirun noticed that process rank 25 with PID 21954 on node home18 exited on
signal 11 (Segmentation fault).
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I am not getting where it is going wrong and how to correct it.

this would happen for a bad/unphysical setup

could you please help

i wouldn't know how. i am neither a magician
nor a psychic.

axel.