[llvm-bugs] [Bug 36720] New: Tasking: assertion failure in kmp_runtime.c

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36720

            Bug ID: 36720
           Summary: Tasking: assertion failure in kmp_runtime.c
           Product: OpenMP
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: grokos at us.ibm.com
                CC: llvm-bugs at lists.llvm.org

Tested on x86_64 and ppc64le, RHEL.

The following code triggers an assertion failure:

#define N 1024
int main()
{
  #pragma omp task
  {
    #pragma omp parallel for
    for (int i=0; i<N; i++)
      (void) 0;
  }

  #pragma omp task
  {
    #pragma omp parallel for
    for(int i=0; i<N; ++i)
      (void) 0;
  }

  #pragma omp taskwait

  return 0;
}

Assertion failure at kmp_runtime.cpp(1715): nthreads > 0.
OMP: Error #13: Assertion failure at kmp_runtime.cpp(1715).

The assertion fails even with OMP_NUM_THREADS=1. If I remove the second task,
everything runs to completion. If I remove the "omp parallel for" directives
from inside the tasks, once again everything runs fine.

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