I'm trying to use local arrays in an OMP target region. If its size is dependent on a variable, the device will crash with a SIGSEGV "offload error: process on the device 0 was terminated by signal 11 (SIGSEGV)"
Code:
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char *argv[]) {
{
int size=argc*100000;
int ar[size];
int ar2[100000];
printf("Size host %lld %lld\n",sizeof(ar),sizeof(ar2));
#pragma omp target map(alloc:ar,ar2)
printf("Size device %lld %lld\n",sizeof(ar),sizeof(ar2));
printf("Size worked\n");
#pragma omp target map(alloc:ar2)
ar2[size-1]=55;
printf("Static worked\n");
#pragma omp target map(alloc:ar)
ar[size-1]=55;
printf("Dynamic worked\n");
}
return EXIT_SUCCESS;
}
If you run this you get the output:
Size host 400000 400000
Size worked
Static worked
offload error: process on the device 0 was terminated by signal 11 (SIGSEGV)
Strangely: You can access lower entries (e.g. ar[0], ar[1]...) without problems (not sure if they are valid though) and using "10000" as the size does work (at least without a crash). Also doubling the size of ar2 works. Is this a compiler bug or do I have to use this as an array section? If so, can you point me to the OMP spec where this is explained?
