topic Re: sgetrf corrupts the stack? in Intel® oneAPI Math Kernel Library

sgetrf corrupts the stack?

sugarpie — Thu, 15 Jan 2009 15:49:40 GMT

I'm having some issues with sgetrf , when invoked Foo (see code below) I get an exception upon completing the method call to Foo:

Run-Time Check Failure #2 - Stack around the variable 'ipiv' was corrupted.

The exception is thrown when the method returns, that is after the delete [] wpi call. If the call to sgetrf is removed the method executes and returns without corrupting the stack.

I'm using MKL 10.1.0.018 and Visual Studio 2008.

int _tmain(int argc, char *argv[])
{

const int M = 5;
const int K = 4;
const int N = 3;

float* p = new float[K*N];
float* w = new float[K*N];
float* wp = new float[K*N];

memset((void*)wp,0,(size_t)K*N*sizeof(float));
// ...
Foo(p,w,wp,N,N,K);
// ...
}

void Foo(const float* p,float* w,float* wp,int M,int N,int K){
int ipiv = 0;
int info = 0;
float work = 0;
int lwork = 0;
float* wpi = new float[N*N];

memset((void*)wpi,0,(size_t)N*N*sizeof(float));

cblas_sgemm(CblasRowMajor,CblasTrans,CblasNoTrans,N,N,K,1.0f,p,M,w,N,1.0f,wpi,N);
// if this called is removed, the stack does not become corrupt
sgetrf(&N,&N,wpi,&N,&ipiv,&info);
// ...
delete [] wpi;
}

Thanks in advance!
// olof

Re: sgetrf corrupts the stack?

Gennady_F_Intel — Thu, 15 Jan 2009 19:55:08 GMT

Olof,
At the first glance, the cause of the problem dealt with ipiv:
please look at description of sgetrf: Ipiv == array, dimensional at least max(1,min(m.n)) and etc.
Therefore, replace int ipiv by int ipiv and try again.
Please let us know if any further problems.
--Gennady

Re: sgetrf corrupts the stack?

sugarpie — Fri, 16 Jan 2009 07:31:55 GMT

Quoting - Gennady Fedorov (Intel)

Thank you! The stack is now safe and sound=)