topic Re: Re:MacOS + MKL (BLAS) segmentation fault using debug flags in Intel® oneAPI Math Kernel Library

MacOS + MKL (BLAS) segmentation fault using debug flags

Lecris — Wed, 09 Dec 2020 08:31:06 GMT

I have narrowed down an issue when compiling a simple HelloWorld code using debug flags (`-DCMAKE_BUILD_TYPE=Debug`) on MacOS (11.0.1 with XCode 11.7 and Parallel Studio Xe 19.1.2.258 20200623 or XCode 12.2 and OneApi 2021.1.1). I have uploaded my MWE of this issue, and I wish to confirm if it's not miss-configuration on my part.

#include <iostream> #include <mkl.h> int main() { double M[10] = {}; double X[4] = {}; double Y[4] = {}; std::cout << "Trying BLAS operation:" << std::endl; // for (int i = 0; i < 10; i++) cblas_dspmv(CblasColMajor, CblasUpper, 4, 1.0f, M, X, 1, 0.0f, Y, 1); std::cout << "Success" << std::endl; return 0; }

PS: I had a similar issue on Linux, but I cannot currently reproduce it.

Re: MacOS + MKL (BLAS) segmentation fault using debug flags

Lecris — Wed, 09 Dec 2020 08:35:13 GMT

I should add the Segmentation fault error I get is `EXC_BAD_ACCESS (code=EXC_I386_GPFLT)` in the BLAS function, and when the debug mode is turned off the programm runs normally with appropriate results.

Re: MacOS + MKL (BLAS) segmentation fault using debug flags

GouthamK_Intel — Thu, 10 Dec 2020 11:09:07 GMT

Hi,

Thanks for reaching out to us!

As your issue is related to MKL and we have a dedicated forum for MKL related issues. So we are redirecting your thread to MKL Forum for faster response.

Have a Good day!

Thanks & Regards

Goutham

Re: MacOS + MKL (BLAS) segmentation fault using debug flags

Lecris — Fri, 11 Dec 2020 08:24:40 GMT

I have found the porblem, and indeed it was a configuration error.

I was compiling and linking with `ilp64` while still using default `int` parameters. After switching to `lp64` everything works perfectly fine.

Re:MacOS + MKL (BLAS) segmentation fault using debug flags

RahulV_intel — Tue, 15 Dec 2020 05:37:14 GMT

Hi,

Thanks for the update. Good to know that it worked. Let me know if I can close this thread from my end?

Regards,

Rahul

Re: Re:MacOS + MKL (BLAS) segmentation fault using debug flags

Lecris — Tue, 15 Dec 2020 05:58:47 GMT

Of course, go ahead and close it. Maybe someone in the same situation as me will find this post by accident when needed.

Re:MacOS + MKL (BLAS) segmentation fault using debug flags

RahulV_intel — Tue, 15 Dec 2020 06:20:39 GMT

Thanks for the confirmation. Intel will no longer monitor this thread. Further responses on this thread will be considered community only.

--Rahul