[gmx-users] Crashing abnormally

[Amadeu]

For testing pruposes, I have running Tieleman's 128 DPPC bilayer in
parallel (4 processors - 2 dual nodes), and I am getting some strange
results. I started two runs with same configuration. One was set to
run with a double precision version of Gromacs and it crashed after
about 1 ns with:

**Fatal error: ci = 1777 should be in 0 .. 1727 [FILE nsgrid.c, LINE 218]

The other is running with a single precision version of Gromacs and it
continues without problems.

I have seen many of my jobs crashing with this Fatal error several
times. There are similar postings in the mailing list, but the problem
still puzzles me.

I am running Gromacs 3.2.1 compiled with MPICH 1.2.5. The system is an
Opteron cluster. The simulations are set to run in the NPT ensemble
with PME and a 2-fs time-step. There is nothing unusual about the
setting, as far as I can tell.

I would appreciate if anyone could comment on this error and perhaps
provide some input/feedback what may be happening. Is it possible
there is something to do with hardware/memory problem?

Thanks,

               Amadeu