[llvm-bugs] [Bug 28336] New: omp_sections_nowait fails nondeterministically

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28336

            Bug ID: 28336
           Summary: omp_sections_nowait fails nondeterministically
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: hfinkel at anl.gov
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Running on a Intel Xeon E5-2699 with 18 cores (72 hyperthreads), the test
omp_sections_nowait fails nondeterministically. To reproduce, this works for
me:

$ ulimit -u 50000
$ for s in $(seq 1 72); do
(((/path/to/build/llvm-stage1/projects/openmp/runtime/test/worksharing/sections/Output/omp_sections_nowait.c.tmp
> /dev/null 2>&1); echo $?) &); done

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

(as you can see, some of the tests existed with '1' instead of '0').

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