Index: compiler-rt/test/lit.common.cfg
===================================================================
--- compiler-rt/test/lit.common.cfg
+++ compiler-rt/test/lit.common.cfg
@@ -327,3 +327,7 @@
 # because the test hangs or fails on one configuration and not the other.
 if config.android or (config.target_arch not in ['arm', 'armhf', 'aarch64']):
   config.available_features.add('stable-runtime')
+
+# Detect custom shadow scale.
+if config.asan_shadow_scale != '' and config.asan_shadow_scale != '3':
+  config.available_features.add("custom-shadow-scale")