https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117247
Bug ID: 117247
Summary: [OpenMP][nvptx] cuCtxSynchronize with 'omp target
loop' + PRIVATE clause and -O1 (OpenMP_VV's
teams_loop/test_target_teams_loop_private.c)
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: openmp, wrong-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
CC: tschwinge at gcc dot gnu.org
Target Milestone: ---
Created attachment 59402
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59402&action=edit
C testcase
Shows up with OpenMP_VV's
https://github.com/OpenMP-Validation-and-Verification/OpenMP_VV/blob/master/tests/5.0/teams_loop/test_target_teams_loop_private.c
It works with AMD GCN or -O0 but with -O1 and higher, it fails with:
libgomp: cuCtxSynchronize error: an illegal memory access was encountered
libgomp: cuMemFree_v2 error: an illegal memory access was encountered
libgomp: device finalization failed
The problem is 'omp target' + 'omp loop' + 'private'; using 'for' instead of
'loop' works.
Simplified test case attached ('target loop' not 'target teams loop').
