topic Re: segmentation fault when linking libc and mkl statically in Intel® oneAPI Math Kernel Library

segmentation fault when linking libc and mkl statically

may_ka — Tue, 07 Dec 2021 22:50:25 GMT

Hi there,

the following program crashes when libc and mkl are both linked statically. I found this for compilers g++ and intel clang++ for linux kernels 5.10 and 3.10. Under kernel 3.10 the crash occurs with g++/libc version >=8.3.

#include <string> #include <iostream> #include "mkl.h" void zzzz(){ double *z,*zz; double x=cblas_ddot(10,z,1,zz,1); } int main(int argc, char** argv){ std::string msg; try{ msg="bla";throw msg; }catch(std::string msg){ std::cout<<"an error has occured."<<std::endl; return(1); } return(0); }

the makefile was

SHELL := /bin/bash intel_loc=/opt/intel export LD_LIBRARY_PATH=$(intel_loc)/oneapi/compiler/2021.2.0/linux/compiler/lib/intel64_lin:$LD_LIBRARY_PATH a=$(shell source $(intel_loc)/oneapi/setvars.sh; echo $$PATH) export PATH = $(a) gnu: g++ -march=native -O3 -ffast-math -static -static-libstdc++ main1.cpp -I /opt/intel/oneapi/mkl/2021.2.0//include/ -I /opt/intel/oneapi/mkl/2021.2.0//include/intel64/ilp64 -Wl,--start-group /opt/intel/oneapi/mkl/2021.2.0//lib/intel64/libmkl_intel_ilp64.a /opt/intel/oneapi/mkl/2021.2.0//lib/intel64/libmkl_core.a /opt/intel/oneapi/mkl/2021.2.0//lib/intel64/libmkl_sequential.a -Wl,--whole-archive -lpthread -Wl,--no-whole-archive -lm -ldl iclang: clang++ -march=native -O3 -static -static-libstdc++ main1.cpp -I /opt/intel/oneapi/mkl/2021.2.0//include/ -I /opt/intel/oneapi/mkl/2021.2.0//include/intel64/ilp64 -Wl,--start-group /opt/intel/oneapi/mkl/2021.2.0//lib/intel64/libmkl_intel_ilp64.a /opt/intel/oneapi/mkl/2021.2.0//lib/intel64/libmkl_core.a /opt/intel/oneapi/mkl/2021.2.0//lib/intel64/libmkl_sequential.a -Wl,--whole-archive -lpthread -Wl,--no-whole-archive -lm -ldl

A workaround is to change from "-static" to "-static-intel". However any other suggestions/workaround for this?

Thanks

Re: segmentation fault when linking libc and mkl statically

VidyalathaB_Intel — Wed, 08 Dec 2021 12:40:19 GMT

Hi Karl,

Thanks for reaching out to us.

>> A workaround is to change from "-static" to "-static-intel"

As you wanted to link the MKL statically you need to use -static-intel flag during compiling your code, as per the documentation when you use

-static --- It prevents the code from linking with shared libraries

-static-intel --- It is used to link the Intel provided libraries statically

Please refer to the below documentation link for more details

https://www.intel.com/content/www/us/en/develop/documentation/oneapi-dpcpp-cpp-compiler-dev-guide-and-reference/top/compiler-reference/compiler-options/alphabetical-list-of-compiler-options.html

Regards,

Vidya.

Re: segmentation fault when linking libc and mkl statically

may_ka — Wed, 08 Dec 2021 13:10:57 GMT

Hi,

thank you for your response.

I am aware that for clang++ the workaround flags are "-static -shared-libgcc" and for icpc "-static-intel" .....................

However, the question was how I can link libgcc AND mkl statically (with clang++) *without* having a segfault in case an exceptions is thrown.

Best

Re: segmentation fault when linking libc and mkl statically

VidyalathaB_Intel — Tue, 14 Dec 2021 17:49:05 GMT

Hi Karl,

>>how I can link libgcc AND mkl statically (with clang++) *without* having a segfault in case an exceptions is thrown.

Could you please try with the below command and let us know if it helps in resolving the issue?

clang++ -march=native -O3 -qmkl -Wl,--start-group ${MKLROOT}/lib/intel64/libmkl_intel_ilp64.a ${MKLROOT}/lib/intel64/libmkl_sequential.a ${MKLROOT}/lib/intel64/libmkl_core.a -Wl,--end-group -lpthread -lm -ldl -static-libgcc -static <file.cpp>

Please find the below screenshot for more details.

Regards,

Vidya.

Re:segmentation fault when linking libc and mkl statically

VidyalathaB_Intel — Tue, 21 Dec 2021 05:06:12 GMT

Hi Karl,

Reminder:

Has the solution provided above helped? If yes, could you please confirm whether we can close this thread from our end?

Regards,

Vidya.

Re:segmentation fault when linking libc and mkl statically

VidyalathaB_Intel — Wed, 29 Dec 2021 07:51:58 GMT

Hi Karl,

As we have not heard back from you, we are closing this thread assuming that your issue is resolved.

Please post a new question if you need any additional information from Intel as this thread will no longer be monitored.

Regards,

Vidya.