https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83295
Bug ID: 83295
Summary: libgomp complains about trying to map data that is
already mapped
Product: gcc
Version: 7.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libgomp
Assignee: unassigned at gcc dot gnu.org
Reporter: pophaless at ornl dot gov
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Created attachment 42798
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42798&action=edit
full test to reproduce bug.
Executing the attached code with gcc/7.1.1-20170802 cuda/8.0.61-1
code snippet:
/* Initialize arrays a, b and c */
#pragma omp target enter data if(size > SIZE_THRESHOLD) map(to: size) map(to:
c[0:size])
#pragma omp target if(size > SIZE_THRESHOLD) \
map(to: a[0:size], b[0:size]) map(tofrom: isHost)\
map(from: isOffloading)
{
isOffloading = !omp_is_initial_device();
isHost = omp_is_initial_device();
int alpha = (isHost ? 0 : 1);
int j = 0;
for (j = 0; j < size; j++) {
// c[j] is zero if executed in the host
// c[j] is 1+j if executed on the device
c[j] = alpha*(a[j] + b[j]);
}
} // end target
#pragma omp target exit data if(size > SIZE_THRESHOLD) map(from: c[0:size])
/*Check if array c was updated correctly*/
Compile line: gcc -O3 -std=c99 -fopenmp -foffload="-lm" -lm test.c -o tst
Compiles without error.
Error message at execution:
libgomp: Trying to map into device [0x3fffc8f1a9e0..0x3fffc8f1b9e0) object when
[0x3fffc8f1a9e0..0x3fffc8f1b5e0) is already mapped
