Index: test/Modules/crash-vfs-ivfsoverlay.m
===================================================================
--- test/Modules/crash-vfs-ivfsoverlay.m
+++ test/Modules/crash-vfs-ivfsoverlay.m
@@ -7,6 +7,7 @@
 // RUN:   %S/../VFS/Inputs/vfsoverlay2.yaml > %t/srcvfs.yaml
 
 // RUN: not env FORCE_CLANG_DIAGNOSTICS_CRASH= TMPDIR=%t TEMP=%t TMP=%t \
+// RUN:         ASAN_OPTIONS=detect_leaks=0 \
 // RUN: %clang -fsyntax-only -nostdinc %s \
 // RUN:     -I %S/Inputs/crash-recovery/usr/include \
 // RUN:     -ivfsoverlay %t/srcvfs.yaml \
Index: test/lit.cfg
===================================================================
--- test/lit.cfg
+++ test/lit.cfg
@@ -407,6 +407,9 @@
 # Sanitizers.
 if 'Address' in config.llvm_use_sanitizer:
     config.available_features.add("asan")
+    # LeakSanitizer is disabled by default on Darwin, enable it
+    if re.match(r'^x86_64-apple.*', config.target_triple):
+        config.environment['ASAN_OPTIONS'] = 'detect_leaks=1'
 else:
     config.available_features.add("not_asan")
 if 'Memory' in config.llvm_use_sanitizer: