Merge pull request #6420 from hjmjohnson/fix-adaptive-nlm-flaky-race

BUG: Fix flaky AdaptiveNonLocalMeansDenoisingImageFilterTest1 under parallel load

Author: hjmjohnson

Modules/Filtering/AdaptiveDenoising/test/itkAdaptiveNonLocalMeansDenoisingImageFilterTest.cxx

@@ -115,6 +115,10 @@ itkAdaptiveNonLocalMeansDenoisingImageFilterTest(int argc, char * argv[])
   ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, AdaptiveNonLocalMeansDenoisingImageFilter, NonLocalPatchBasedImageFilter);
 
   filter->SetInput(reader->GetOutput());
+
+  // Single-threaded: m_RicianBiasImage data race across work-unit boundaries; see #6419.
+  filter->SetNumberOfWorkUnits(1);
+
   filter->SetUseRicianNoiseModel(false);
   ITK_TEST_SET_GET_VALUE(false, filter->GetUseRicianNoiseModel());