[mcfdma]

Hello.

So I ran a case (modified solver:interFoam + EHD) on OF231 parallel with 32 processor.
The simulation ran for the first time smoothly with no error.

I made some tweaks in the velocity(x component) and ran again and started getting an error.

I resubmitted my original case and now the original case also crashes. I have attached the error log.

 You must now run the following command to complete the setup:

    source $foamDotFile

[7] --------------------------------------------------------------------------
A 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 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:          [[22450,1],7] (PID 405000)

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.
--------------------------------------------------------------------------
#0  Foam::error::printStack(Foam::Ostream&) at ??:?
[7] #1  Foam::sigFpe::sigHandler(int) at ??:?
[7] #2   in "/lib64/libc.so.6"
[7] #3  Foam::GAMGSolver::scale(Foam::Field<double>&, Foam::Field<double>&, Foam::lduMatrix const&, Foam::FieldField<Foam::Field, double> const&, Foam::UPtrList<Foam::lduInterfaceField const> const&, Foam::Field<double> const&, unsigned char) const at ??:?
[7] #4  Foam::GAMGSolver::Vcycle(Foam::PtrList<Foam::lduMatrix::smoother> const&, Foam::Field<double>&, Foam::Field<double> const&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::Field<double>&, Foam::PtrList<Foam::Field<double> >&, Foam::PtrList<Foam::Field<double> >&, unsigned char) const at ??:?
[7] #5  Foam::GAMGSolver::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
[7] #6  Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:?
[7] #7  Foam::fvMatrix<double>::solve(Foam::dictionary const&) at ??:?
[7] #8  
[7]  at ??:?
[7] #9  __libc_start_main in "/lib64/libc.so.6"
[7] #10  
[7]  at ??:?
[node914:405000:0:405000] Caught signal 8 (Floating point exception: tkill(2) or tgkill(2))
==== backtrace ====
    0  /opt/apps/libs/ucx/1.5.0/lib/libucs.so.0(+0x1b960) [0x2b7b53171960]
    1  /opt/apps/libs/ucx/1.5.0/lib/libucs.so.0(+0x1bcd3) [0x2b7b53171cd3]
    2  /lib64/libc.so.6(+0x35270) [0x2b7b39cc2270]
    3  /lib64/libc.so.6(gsignal+0x37) [0x2b7b39cc21f7]
    4  /lib64/libc.so.6(+0x35270) [0x2b7b39cc2270]
    5  /opt/apps/apps/gcc/openfoam/2.3.1/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZNK4Foam10GAMGSolver5scaleERNS_5FieldIdEES3_RKNS_9lduMatrixERKNS_10FieldFieldIS1_dEERKNS_8UPtrListIKNS_17lduInterfaceFieldEEERKS2_h+0x9d) [0x2b7b38c2d0fd]
    6  /opt/apps/apps/gcc/openfoam/2.3.1/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZNK4Foam10GAMGSolver6VcycleERKNS_7PtrListINS_9lduMatrix8smootherEEERNS_5FieldIdEERKS8_S9_S9_S9_S9_S9_RNS1_IS8_EESD_h+0x20ba) [0x2b7b38c3174a]
    7  /opt/apps/apps/gcc/openfoam/2.3.1/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so(_ZNK4Foam10GAMGSolver5solveERNS_5FieldIdEERKS2_h+0x656) [0x2b7b38c32a06]
    8  /opt/apps/apps/gcc/openfoam/2.3.1/OpenFOAM-2.3.1/platforms/linux64GccDPOpt/lib/libfiniteVolume.so(_ZN4Foam8fvMatrixIdE15solveSegregatedERKNS_10dictionaryE+0x15d) [0x2b7b36f9246d]
    9  new1interFoam(_ZN4Foam8fvMatrixIdE5solveERKNS_10dictionaryE+0x12c) [0x4a75cc]
   10  new1interFoam() [0x43a1b9]
   11  /lib64/libc.so.6(__libc_start_main+0xf5) [0x2b7b39caec05]
   12  new1interFoam() [0x43efb1]
===================
--------------------------------------------------------------------------
Primary job  terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun noticed that process rank 7 with PID 0 on node node914 exited on signal 8 (Floating point exception).
--------------------------------------------------------------------------

I understand it is my linear solver but why was it able to run normally for the first time without any error? This is getting confusing.

Any help?