[llvm-bugs] [Bug 30889] New: Target teams: assertion failure in kmp_runtime.c

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30889

            Bug ID: 30889
           Summary: Target teams: assertion failure in kmp_runtime.c
           Product: OpenMP
           Version: unspecified
          Hardware: All
                OS: Linux
            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
    Classification: Unclassified

Tested on x86_64 and ppc64le, RHEL.

The following code with target offloading disabled triggers an assertion
failure:

int main() {
  #pragma omp target teams num_teams(2) if(target:0)
  {
    (void) 0;
  }
  return 0;
}

Assertion failure at kmp_runtime.c(2292): master_th->th.th_task_team ==
team->t.t_task_team[master_th->th.th_task_state].
OMP: Error #13: Assertion failure at kmp_runtime.c(2292).

If I set num_teams(1) then the program runs to completion, with 2 teams or more
the assertion trips. If I comment out the assertion or use libomp in release
mode, the program runs fine no matter how many teams we have.

The same assertion is found in various places throughout kmp_runtime.c, in one
instance (line 2051) the assertion has been patched out with a comment saying
that the assertion is known to trap although the runtime operates correctly.

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