Index: compiler-rt/trunk/test/ubsan/lit.common.cfg
===================================================================
--- compiler-rt/trunk/test/ubsan/lit.common.cfg
+++ compiler-rt/trunk/test/ubsan/lit.common.cfg
@@ -74,3 +74,7 @@
 config.available_features.add('arch=' + config.target_arch)
 
 config.excludes = ['Inputs']
+
+if "ubsan-asan" in config.available_features or "ubsan-tsan" in config.available_features:
+  if not config.parallelism_group:
+    config.parallelism_group = 'shadow-memory'