| floquation |
October 17, 2014 10:01 |
Segmentation Fault caused by a pointer
Hello,
I am writing a custom CloudFunctionObject, which I based on "ParticleTrap".
Code:
vi $FOAM_SRC/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleTrap/ParticleTrap.C
For this CloudFunctionObject I will need to interpolate continuum values to particle positions, for which I use "interpolationCellPoint". My pointer to it seems, however, to fail somehow.
Without using parallelisation, I get the following output/error, including my test messages:
Code:
Solving 2-D cloud inclusion
[0] preEvolve begins.
[0] alphaInterpPtr_.valid()? 0
[0] alphaInterpPtr_.empty()? 1
[0] cellI of (0,0.015,0) = 59899
[0] start of if-scope.
[0] alpha has been found.
[0] alphaPtr_ is set.
[0] interpolator is constructed
[0] alphaInterpPtr_ is set.
[0] INSIDE scope test:
[0] alpha at cellCenter = 0
[0] alpha at (0,0.015,0) = 0
[0] alphaInterpPtr_.valid()? 1
[0] alphaInterpPtr_.empty()? 0
[0] OUTSIDE scope test:
[0] alpha at cellCenter = 0
[0] alpha at (0,0.015,0) = 0
[0] OUTSIDE scope test:
[0] alpha at cellCenter = 0
[0] alpha at (0,0.015,0) = 0
[0] POSTMOVE begin
[0] p.origId() = 0
[0] POSTMOVE --> cellI of (0,0.015,0) = 59899
[0] alphaInterpPtr_.valid()? 1
[0] alphaInterpPtr_.empty()? 0
[0] POSTMOVE scope test:
[0] alpha at cellCenter = 0
#0 Foam::error::printStack(Foam::Ostream&) in "/apps/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1 Foam::sigSegv::sigHandler(int) in "/apps/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 __restore_rt at sigaction.c:0
#3 Foam::kvaParticleCaptureAndHold<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >::postMove(Foam::KinematicParcel<Foam::particle>&, int, double, Foam::Vector<double> const&, bool&) in "/home/A077594/OpenFOAM/A077594-2.3.x/platforms/linux64GccDPOpt/lib/libcustomCloudFunctionObjects_v3.so"
#4 Foam::CloudFunctionObjectList<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >::postMove(Foam::KinematicParcel<Foam::particle>&, int, double, Foam::Vector<double> const&, bool&) in "/apps/OpenFOAM/site/2.3.x/platforms/linux64GccDPOpt/lib/libsimpleLagrangianFunctionObjects.so"
#5 bool Foam::KinematicParcel<Foam::particle>::move<Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > > >(Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >&, double) in "/apps/OpenFOAM/site/2.3.x/platforms/linux64GccDPOpt/lib/libsimpleLagrangianFunctionObjects.so"
#6 void Foam::InjectionModel<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >::inject<Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > > >(Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >&) in "/apps/OpenFOAM/site/2.3.x/platforms/linux64GccDPOpt/lib/libsimpleLagrangianFunctionObjects.so"
#7 void Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > >::evolveCloud<Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > > >(Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >&) in "/apps/OpenFOAM/site/2.3.x/platforms/linux64GccDPOpt/lib/libsimpleLagrangianFunctionObjects.so"
#8 void Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > >::solve<Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > > >(Foam::KinematicParcel<Foam::particle>::TrackingData<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >&) in "/apps/OpenFOAM/site/2.3.x/platforms/linux64GccDPOpt/lib/libsimpleLagrangianFunctionObjects.so"
#9 Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > >::evolve() in "/apps/OpenFOAM/site/2.3.x/platforms/linux64GccDPOpt/lib/libsimpleLagrangianFunctionObjects.so"
#10 Foam::EvolveCloudFunctionObject<Foam::KinematicCloud<Foam::Cloud<Foam::KinematicParcel<Foam::particle> > > >::execute(bool) in "/apps/OpenFOAM/site/2.3.x/platforms/linux64GccDPOpt/lib/libsimpleLagrangianFunctionObjects.so"
#11 Foam::functionObjectList::execute(bool) in "/apps/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#12 Foam::Time::run() const in "/apps/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#13 main in "/apps/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/bin/interFoam"
#14 __libc_start_main in "/lib64/libc.so.6"
#15 __gxx_personality_v0 in "/apps/OpenFOAM/OpenFOAM-2.3.x/platforms/linux64GccDPOpt/bin/interFoam"
Segmentation fault
Judging from the location of the crash (red in the code below), there is something wrong with the pointer.
More specifically, the line which crashes is:
Code:
scalar testVal = alphaInterpPtr_->interpolate(testPoint, testCell); //Does the pointer work?
Which could be the interpolator, for all we know. However, the line
Code:
alphaInterpPtr_.clear();
causes a crash as well, indicating that I have a pointer issue.
Not using the autoPtr class, but a regular C-pointer (VariableName*), will yield exactly the same result.
Question:
Does anyone know what goes wrong?
Or alternatively, does someone know a work-around / good practice to use?
(I'm trying not to construct a new interpolationCellPoint<scalar> in each postMove(), since it will be called thousands of times per iteration.)
--- Code Appendix ---
Snippet from the header:
Code:
#include "CloudFunctionObject.H"
#include "volFields.H"
#include "interpolationCellPoint.H"
class kvaParticleCaptureAndHold
:
public CloudFunctionObject<CloudType>
{
//- Pointer to the volume fraction field
const volScalarField* alphaPtr_;
autoPtr<interpolationCellPoint<scalar> > alphaInterpPtr_;
//const interpolationCellPoint<scalar>* alphaInterpPtr_;
public:
//- Pre-evolve hook
virtual void preEvolve();
//- Post-evolve hook
virtual void postEvolve();
//- Post-move hook
virtual void postMove
(
typename CloudType::parcelType& p,
const label cellI,
const scalar dt,
const point& position0,
bool& keepParticle
);
}
C-file (preEvolve()):
(For a single processor, this code executes without a problem. In parallel, this code crashes. This is probably for the same reason as my serial code crashes in postMove(), so let's ignore that for now.)
Code:
template<class CloudType>
void Foam::kvaParticleCaptureAndHold<CloudType>::preEvolve()
{
Sout << "[" << Pstream::myProcNo() << "] " << "preEvolve begins." << nl;
Sout << "[" << Pstream::myProcNo() << "] " << "alphaInterpPtr_.valid()? " << (alphaInterpPtr_.valid()) << nl;
Sout << "[" << Pstream::myProcNo() << "] " << "alphaInterpPtr_.empty()? " << (alphaInterpPtr_.empty()) << nl;
vector testPoint(0.,0.015,0.);
label testCell = this->owner().mesh().findCell(testPoint);
Sout << "[" << Pstream::myProcNo() << "] " << "cellI of (0,0.015,0) = " << testCell << nl;
if (alphaPtr_ == NULL)
{
Sout << "[" << Pstream::myProcNo() << "] " << "start of if-scope." << nl;
const fvMesh& mesh = this->owner().mesh();
const volScalarField& alpha =
mesh.lookupObject<volScalarField>(alphaName_);
Sout << "[" << Pstream::myProcNo() << "] " << "alpha has been found." << nl;
alphaPtr_ = α
Sout << "[" << Pstream::myProcNo() << "] " << "alphaPtr_ is set." << nl;
interpolationCellPoint<scalar> alphaInterp(*alphaPtr_);
Sout << "[" << Pstream::myProcNo() << "] " << "interpolator is constructed" << nl;
alphaInterpPtr_.set(&alphaInterp);
Sout << "[" << Pstream::myProcNo() << "] " << "alphaInterpPtr_ is set. " << nl;
if(testCell != -1){ //if point is inside mesh (of the current processor)
Sout << "[" << Pstream::myProcNo() << "] " << "INSIDE scope test: " << nl;
scalar alphaAtP = alphaPtr_->internalField()[testCell]; //Does the pointer work?
Sout << "[" << Pstream::myProcNo() << "] " << "alpha at cellCenter = " << alphaAtP << nl;
scalar testVal = alphaInterpPtr_->interpolate(testPoint, testCell); //Does the pointer work?
Sout << "[" << Pstream::myProcNo() << "] " << "alpha at (0,0.015,0) = " << testVal << nl;
}
}
Sout << "[" << Pstream::myProcNo() << "] " << "alphaInterpPtr_.valid()? " << (alphaInterpPtr_.valid()) << nl;
Sout << "[" << Pstream::myProcNo() << "] " << "alphaInterpPtr_.empty()? " << (alphaInterpPtr_.empty()) << nl;
if(testCell != -1){ //if point is inside mesh (of the current processor)
Sout << "[" << Pstream::myProcNo() << "] " << "OUTSIDE scope test: " << nl;
scalar alphaAtP = alphaPtr_->internalField()[testCell]; //Does the pointer work?
Sout << "[" << Pstream::myProcNo() << "] " << "alpha at cellCenter = " << alphaAtP << nl;
scalar testVal = alphaInterpPtr_->interpolate(testPoint, testCell); //Does the pointer work?
Sout << "[" << Pstream::myProcNo() << "] " << "alpha at (0,0.015,0) = " << testVal << nl;
}
}
C-file (postMove()):
(Just so you know: this method is called for each particle several times, but the code crashes for the very first time this method is called.)
Code:
template<class CloudType>
void Foam::kvaParticleCaptureAndHold<CloudType>::postMove
(
parcelType& p, //reference to parcel, e.g.: KinematicParcel<ParcelType> (which extends ParcelType); Where e.g.: ParcelType = particle.
const label cellI, //cellID in which the movement took place (movement across a cell border is done in a separate step and thus a separate postMove() call!)
const scalar dt, //delta time
const point& position0, //position before moving
bool& //keepParticle variable
)
{
Sout << "[" << Pstream::myProcNo() << "] " << "POSTMOVE begin" << nl;
//alphaInterpPtr_.clear(); //Line inserted to see if the autoPtr object responds to me //CRASH if uncommented
//Sout << "[" << Pstream::myProcNo() << "] " << "alphaItnerPtr_ is cleared." << nl;
vector testPoint(0.,0.015,0.);
label testCell = this->owner().mesh().findCell(testPoint);
Sout << "[" << Pstream::myProcNo() << "] " << "POSTMOVE --> cellI of (0,0.015,0) = " << testCell << nl;
Sout << "[" << Pstream::myProcNo() << "] " << "alphaInterpPtr_.valid()? " << (alphaInterpPtr_.valid()) << nl;
Sout << "[" << Pstream::myProcNo() << "] " << "alphaInterpPtr_.empty()? " << (alphaInterpPtr_.empty()) << nl;
if(testCell != -1){ //if point is inside mesh (of the current processor)
Sout << "[" << Pstream::myProcNo() << "] " << "POSTMOVE scope test: " << nl;
scalar alphaAtP = alphaPtr_->internalField()[testCell]; //Does the pointer work?
Sout << "[" << Pstream::myProcNo() << "] " << "alpha at cellCenter = " << alphaAtP << nl;
scalar testVal = alphaInterpPtr_->interpolate(testPoint, testCell); //Does the pointer work? //CRASH if "alphaInterpPtr_.clear();" above is commented
Sout << "[" << Pstream::myProcNo() << "] " << "alpha at (0,0.015,0) = " << testVal << nl;
}
}
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