??? wrote:
Hello,
       I meet a problem, that is "segmentation fault." And this
"segmentation fault" comes out when I heat  my system, the step "grompp -f
heat_water.mdp  -c...-n ...-p ...-o ...".  The original signs are as
follows:
processing topology...
Opening library file /usr/local/gromacs/share/gromacs/top/ff_dum.itp
Generated 222 of the 2415 non-bonded parameter combinations
Segmentation fault
     I wish someone can help me solve this promblem. Thanks a lot!

"Segmentation fault" is a generic indication of something going catastrophically wrong. If grompp works on other library files (go and test it if necessary!) then you've probably mis-formatted ff_dum.itp and need to compare it with the correct ones and/or the information in chapter 5 of the manual.

Mark
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