[Openmp-dev] Libomptarget fatal error 1: '#pragma omp requires unified_shared_memory' not used consistently!

[Itaru Kitayama via Openmp-dev]

Removed the internal function, but I get:

CUDA device 0 info: Device supports up to 65536 CUDA blocks and 1024
threads with a warp size of 32
CUDA device 0 info: Launching kernel
__omp_offloading_34_8009dd23_main_l12 with 1 blocks and 33 threads in
Generic mode
CUDA error: Error when synchronizing stream. stream =
0x0000000001d22ae0, async info ptr = 0x00007ffe73ea2728
CUDA error: an illegal memory access was encountered
Libomptarget error: Failed to synchronize device.
Libomptarget error: Call to targetDataEnd failed, abort target.
Libomptarget error: Failed to process data after launching the kernel.
Libomptarget error: Source location information not present. Compile
with -g or -gline-tables-only.
Libomptarget fatal error 1: failure of target construct while
offloading is mandatory
/var/spool/parastation/jobs/8941317: line 23: 20812 Aborted
     (core dumped) ./a.out

On Sun, Feb 28, 2021 at 10:35 AM Alexey Bataev <a.bataev at hotmail.com> wrote:
>
> Do not call __tgt_register_requires directly, this is the internal function called by global constructor and its arg value depends on #pragma omp requires. Use just this pragma.
>
> Best regards,
> Alexey Bataev
>
> > 27 февр. 2021 г., в 20:28, Itaru Kitayama via Openmp-dev <openmp-dev at lists.llvm.org> написал(а):
> >
> > I'm trying to build a test C++ code that uses part of
> > unified_shared_memory/shared_update.c
> >
> >> On Sun, Feb 28, 2021 at 10:25 AM Johannes Doerfert
> >> <johannesdoerfert at gmail.com> wrote:
> >>
> >> I don't see this test, nor do I understand what you are trying to say.
> >> Is the test failing? If so, which test is this?
> >>
> >> ~ Johannes
> >>
> >>
> >>> On 2/27/21 7:17 PM, Itaru Kitayama via Openmp-dev wrote:
> >>> The below C++ code builds, but the executable fails at runtime.
> >>> (It is taken from the C code under the libomptarget subdir's test directory)
> >>>
> >>> #include <omp.h>
> >>>
> >>> #pragma omp requires unified_shared_memory
> >>> #define N 1024
> >>> extern "C" void __tgt_register_requires(int64_t);
> >>>
> >>> int main() {
> >>>
> >>>   int a[N] = {0};
> >>>   int b[N] = {0};
> >>>   int *device_data;
> >>>   __tgt_register_requires(1);
> >>> #pragma omp target map(tofrom : device_data)
> >>>   {
> >>>     device_data = &a[0];
> >>>     for (int i = 0; i < 1024; i++) {
> >>>       a[i] += 1;
> >>>     }
> >>>   }
> >>> }
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