[cwang5]

Hi guys,

I was trying to run a parallel simulation for a custom made code when I received this error message from MPI:

[1] #0  Foam::error::printStack(Foam::Ostream&)-------------------------------------------------------------------------- 
 An MPI process has executed an operation involving a call to the 
 "fork()" system call to create a child process.  Open MPI is currently 
 operating in a condition that could result in memory corruption or 
 other system errors; your MPI job may hang, crash, or produce silent 
 data corruption.  The use of fork() (or system() or other calls that 
 create child processes) is strongly discouraged. 
  
 The process that invoked fork was: 
  
   Local host:          compute173 (PID 704) 
   MPI_COMM_WORLD rank: 1 
  
 If you are *absolutely sure* that your application will successfully 
 and correctly survive a call to fork(), you may disable this warning 
 by setting the mpi_warn_on_fork MCA parameter to 0. 
 -------------------------------------------------------------------------- 
  in "/home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libOpenFOAM.so" 
 [1] #1  Foam::sigFpe::sigFpeHandler(int) in "/home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libOpenFOAM.so" 
 [1] #2  __restore_rt at sigaction.c:0 
 [1] #3  Foam::divide(Foam::Field<double>&, Foam::UList<double> const&, Foam::UList<double> const&) in "/home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libOpenFOAM.so" 
 [1] #4  void Foam::divide<Foam::fvPatchField, Foam::volMesh>(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleTransportModels.so" 
 [1] #5  Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > Foam::operator/<Foam::fvPatchField, Foam::volMesh>(Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > const&, Foam::tmp<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> > const&) in "/home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleTransportModels.so" 
 [1] #6  Foam::incompressible::RASModels::kOmegaSST::F2() const in "/home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleRASModels.so" 
 [1] #7  Foam::incompressible::RASModels::kOmegaSST::correct() in "/home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleRASModels.so" 
 [1] #8  main in "/home/m080031/OpenFOAM/m080031-1.6.x/applications/bin/linux64GccDPOpt/flapFoam" 
 [1] #9  __libc_start_main in "/lib64/libc.so.6" 
 [1] #10  Foam::regIOobject::writeObject(Foam::IOstream::streamFormat, Foam::IOstream::versionNumber, Foam::IOstream::compressionType) const in "/home/m080031/OpenFOAM/m080031-1.6.x/applications/bin/linux64GccDPOpt/flapFoam" 
 [compute173:00704] *** Process received signal *** 
 [compute173:00704] Signal: Floating point exception (8) 
 [compute173:00704] Signal code:  (-6) 
 [compute173:00704] Failing at address: 0x2742000002c0 
 [compute173:00704] [ 0] /lib64/libc.so.6 [0x3e1b030280] 
 [compute173:00704] [ 1] /lib64/libc.so.6(gsignal+0x35) [0x3e1b030215] 
 [compute173:00704] [ 2] /lib64/libc.so.6 [0x3e1b030280] 
 [compute173:00704] [ 3] /home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libOpenFOAM.so(_ZN4Foam6divideERNS_5FieldIdEERKNS_5UListIdEES6_+0xc1) [0x2b0d224220a1] 
 [compute173:00704] [ 4] /home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleTransportModels.so(_ZN4Foam6divideINS_12fvPatchFieldENS_7volMeshEEEvRNS_14GeometricFieldIdT_T0_EERKS6_S9_+0xd9) [0x2b0d208fb8e9] 
 [compute173:00704] [ 5] /home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleTransportModels.so(_ZN4FoamdvINS_12fvPatchFieldENS_7volMeshEEENS_3tmpINS_14GeometricFieldIdT_T0_EEEERKS8_SA_+0x2d8) [0x2b0d208fcc48] 
 [compute173:00704] [ 6] /home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleRASModels.so(_ZNK4Foam14incompressible9RASModels9kOmegaSST2F2Ev+0x162) [0x2b0d20c166a2] 
 [compute173:00704] [ 7] /home/m080031/OpenFOAM/OpenFOAM-1.6.x/lib/linux64GccDPOpt/libincompressibleRASModels.so(_ZN4Foam14incompressible9RASModels9kOmegaSST7correctEv+0x1874) [0x2b0d20c1b8f4] 
 [compute173:00704] [ 8] /home/m080031/OpenFOAM/m080031-1.6.x/applications/bin/linux64GccDPOpt/flapFoam [0x41e8dd] 
 [compute173:00704] [ 9] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3e1b01d974] 
 [compute173:00704] [10] /home/m080031/OpenFOAM/m080031-1.6.x/applications/bin/linux64GccDPOpt/flapFoam(_ZNK4Foam11regIOobject11writeObjectENS_8IOstream12streamFormatENS1_13versionNumberENS1_15compressionTypeE+0xc9) [0x4199e9] 
 [compute173:00704] *** End of error message ***

The custom solver ran fine for serial computation, and the current simulation ran correctly for ~1 hour before the error showed up. Anyone know what might have cause this "fork" in mpi operation? Thanks.

John