diff --git a/cc/sanitize.go b/cc/sanitize.go
index 513730a..b0eb0c6 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -485,6 +485,11 @@
 	if Bool(s.Hwaddress) {
 		s.Address = nil
 		s.Thread = nil
+		// Disable ubsan diagnosic as a workaround for a compiler bug.
+		// TODO(b/191808836): re-enable.
+		s.Diag.Undefined = nil
+		s.Diag.Integer_overflow = nil
+		s.Diag.Misc_undefined = nil
 	}
 
 	// TODO(b/131771163): CFI transiently depends on LTO, and thus Fuzzer is