[test][hwasan] Describe why HWASAN does not work

diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/huge_malloc.c b/compiler-rt/test/sanitizer_common/TestCases/Posix/huge_malloc.c
index a9c04f3..9eae7a9 100644 (file)
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/huge_malloc.c
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/huge_malloc.c
@@ -10,7 +10,10 @@
 // UNSUPPORTED: android-26
 
 // FIXME: Make it work. Don't xfail to avoid excessive memory usage.
-// UNSUPPORTED: msan, hwasan
+// UNSUPPORTED: msan
+
+// Hwasan requires tagging of new allocations, so needs RSS for shadow.
+// UNSUPPORTED: hwasan
 
 void *p;