Segmentation fault

Hi!

I am running a code to simulate flow of particles whose positions are read from a data file every 1000 steps using the command

run ${runtime} upto every ${dumpstep} &
"read_data read_data_${case}/data_vuori_* add"

But I am recieveing segmentation fault. But, strangely while using valgrind the process runs without stopping untill a later time. I am attaching the LOG files in both cases.

liggghts2 < in.sim_mat_exp &> LOG
valgrind liggghts2 < in.sim_mat_exp_5.3.2012 &> LOG2

I am also attaching some 'read_data' files for reference.

Please help!!

Regards,
Tamoghna