diff --git a/compiler-rt/test/sanitizer_common/TestCases/Linux/decorate_proc_maps.cpp b/compiler-rt/test/sanitizer_common/TestCases/Linux/decorate_proc_maps.cpp
--- a/compiler-rt/test/sanitizer_common/TestCases/Linux/decorate_proc_maps.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Linux/decorate_proc_maps.cpp
@@ -45,16 +45,22 @@
   return (int)(size_t)res;
 }
 
-// CHECK-asan: rw-p {{.*}} [low shadow]
+// In the regex below, the x permission is matched with a '.'. We would
+// like '-', but sometimes 'x' is set, causing buildbot flakiness.
+// This might be due to READ_IMPLIES_EXEC being set (when it occurs all
+// regions with r also have x).
+// TODO: investigate further and change 'rw{{[-x]}}p' back to 'rw-p'
+
+// CHECK-asan: rw{{[-r]}}p {{.*}} [low shadow]
 // CHECK-asan: ---p {{.*}} [shadow gap]
-// CHECK-asan: rw-p {{.*}} [high shadow]
+// CHECK-asan: rw{{[-r]}}p {{.*}} [high shadow]
 
 // CHECK-msan: ---p {{.*}} [invalid]
-// CHECK-msan: rw-p {{.*}} [shadow{{.*}}]
+// CHECK-msan: rw{{[-r]}}p {{.*}} [shadow{{.*}}]
 // CHECK-msan: ---p {{.*}} [origin{{.*}}]
 
-// CHECK-tsan: rw-p {{.*}} [shadow]
-// CHECK-tsan: rw-p {{.*}} [meta shadow]
+// CHECK-tsan: rw{{[-r]}}p {{.*}} [shadow]
+// CHECK-tsan: rw{{[-r]}}p {{.*}} [meta shadow]
 
 // Nothing interesting with standalone LSan and UBSan.
 // CHECK-lsan: decorate_proc_maps