[llvm-bugs] [Bug 50002] New: segmentation fault in libomptarget when using taskloop and target nowait

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50002

            Bug ID: 50002
           Summary: segmentation fault in libomptarget when using taskloop
                    and target nowait
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: xw111luoye at gmail.com
                CC: llvm-bugs at lists.llvm.org

LIBOMP_USE_HIDDEN_HELPER_TASK=0 makes the reproducer to work. So there are some
correlations.

reproducer: clang++ -fopenmp -fopenmp-targets=nvptx64
taskloop_offload_nowait.cpp

#include <iostream>
#include <cstdlib>
#include <cmath>
bool almost_equal(float x, float gold, float tol) {
  if ( std::signbit(x) != std::signbit(gold) )
  {
    x = std::abs(gold) - std::abs(x);
  }
  return std::abs(gold) * (1-tol) <= std::abs(x) && std::abs(x) <=
std::abs(gold) * (1 + tol);
}

int main()
{
  const int N0 { 2 };
  const int N1 { 182 };
  const float expected_value { N0*N1 };
  float counter_N0{};
  #pragma omp target data map(tofrom: counter_N0)
  {
    #pragma omp taskloop shared(counter_N0)
    for (int i0 = 0 ; i0 < N0 ; i0++ )
    {
      #pragma omp target teams distribute parallel for map(tofrom: counter_N0)
nowait
      for (int i1 = 0 ; i1 < N1 ; i1++ )
      {
        #pragma omp atomic update
        counter_N0 = counter_N0 + 1. ;
      }
    }
  }

  if (!almost_equal(counter_N0, expected_value, 0.1)) {
    std::cerr << "Expected: " << expected_value << " Got: " << counter_N0 <<
std::endl;
    std::exit(112);
  }
}

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