# Segmentation fault in first minimization step with gromacs 2019.1 version **URL:** \ **Category:** User discussions\ **Created:** [December 28, 2020, 11:48am UTC](https://gromacs.bioexcel.eu/t/segmentation-fault-in-first-minimization-step-with-gromacs-2019-1-version/1345 "2020-12-28T11:48:27Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![UrvashiS](https://avatars.discourse-cdn.com/v4/letter/u/e47c2d/32.png) [@UrvashiS](https://gromacs.bioexcel.eu/u/UrvashiS)\ **Post date:** [December 28, 2020, 11:48am UTC](https://gromacs.bioexcel.eu/t/segmentation-fault-in-first-minimization-step-with-gromacs-2019-1-version/1345/1 "2020-12-28T11:48:27Z")
GROMACS version:2019.1 and 2020.3 GROMACS modification: Yes/No Here post your question I have generated gromacs input file using charmmGUI. Upon running the first minimization before system equilibration I get following errors. This is same with gromcas version 2019.1 and 2020.3 tried on GPU and CPU respectively. gmx mdrun -v -deffnm step4.0\_minimization Determining whether a GPU is present for GROMACS and starting the proper gmx\_mpi program Step= 509, Dmax= 1.7e+38 nm, Epot= 6.53102e+17 Fmax= inf, atom= 91195 Step= 510, Dmax= 2.0e+38 nm, Epot= 6.52960e+17 Fmax= inf, atom= 91195 Step= 511, Dmax= 2.4e+38 nm, Epot= 6.52823e+17 Fmax= inf, atom= 91195 Step= 512, Dmax= 2.9e+38 nm, Epot= 6.52683e+17 Fmax= inf, atom= 91195 /usr/software/GROMACS/gmx.sh: line 19: 2246757 Segmentation fault (core dumped) /usr/software/GROMACS/gpu/bin/gmx\_mpi “$@” ---
**Author:** ![jalemkul](https://dub1.discourse-cdn.com/flex017/user_avatar/gromacs.bioexcel.eu/jalemkul/32/18_2.png) [@jalemkul](https://gromacs.bioexcel.eu/u/jalemkul)\ **Post date:** [December 29, 2020, 2:49am UTC](https://gromacs.bioexcel.eu/t/segmentation-fault-in-first-minimization-step-with-gromacs-2019-1-version/1345/2 "2020-12-29T02:49:04Z")
Likely you have unreasonable starting coordinates. If CHARMM-GUI inputs don’t work cleanly, you should direct your question to their developers.