diff --git a/fs_mgr/liblp/TEST_MAPPING b/fs_mgr/liblp/TEST_MAPPING
index 04bcbda..875ccb0 100644
--- a/fs_mgr/liblp/TEST_MAPPING
+++ b/fs_mgr/liblp/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name": "liblp_test"
     }
+  ],
+  "hwasan-postsubmit": [
+    {
+      "name": "liblp_test"
+    }
   ]
 }
diff --git a/fs_mgr/libsnapshot/snapshot_test.cpp b/fs_mgr/libsnapshot/snapshot_test.cpp
index 04d228d..36abf71 100644
--- a/fs_mgr/libsnapshot/snapshot_test.cpp
+++ b/fs_mgr/libsnapshot/snapshot_test.cpp
@@ -2411,8 +2411,15 @@
     // fit in super, but not |prd|.
     constexpr uint64_t partition_size = 3788_KiB;
     SetSize(sys_, partition_size);
+    SetSize(vnd_, partition_size);
+    SetSize(prd_, 18_MiB);
 
-    AddOperationForPartitions({sys_});
+    // Make sure |prd| does not fit in super at all. On VABC, this means we
+    // fake an extra large COW for |vnd| to fill up super.
+    vnd_->set_estimate_cow_size(30_MiB);
+    prd_->set_estimate_cow_size(30_MiB);
+
+    AddOperationForPartitions();
 
     // Execute the update.
     ASSERT_TRUE(sm->BeginUpdate());
@@ -2422,8 +2429,25 @@
         GTEST_SKIP() << "Test does not apply to userspace snapshots";
     }
 
-    ASSERT_TRUE(WriteSnapshotAndHash("sys_b"));
+    // Test that partitions prioritize using space in super.
+    auto tgt = MetadataBuilder::New(*opener_, "super", 1);
+    ASSERT_NE(tgt, nullptr);
+    ASSERT_NE(nullptr, tgt->FindPartition("sys_b-cow"));
+    ASSERT_NE(nullptr, tgt->FindPartition("vnd_b-cow"));
+    ASSERT_EQ(nullptr, tgt->FindPartition("prd_b-cow"));
+
+    // Write some data to target partitions.
+    for (const auto& name : {"sys_b", "vnd_b", "prd_b"}) {
+        ASSERT_TRUE(WriteSnapshotAndHash(name));
+    }
+
+    // Assert that source partitions aren't affected.
+    for (const auto& name : {"sys_a", "vnd_a", "prd_a"}) {
+        ASSERT_TRUE(IsPartitionUnchanged(name));
+    }
+
     ASSERT_TRUE(sm->FinishedSnapshotWrites(false));
+
     ASSERT_TRUE(UnmapAll());
 
     class DmStatusFailure final : public DeviceMapperWrapper {
diff --git a/healthd/TEST_MAPPING b/healthd/TEST_MAPPING
index 5893d10..17e363d 100644
--- a/healthd/TEST_MAPPING
+++ b/healthd/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name": "libhealthd_charger_test"
     }
+  ],
+  "hwasan-postsubmit": [
+    {
+      "name": "libhealthd_charger_test"
+    }
   ]
 }
diff --git a/libcutils/TEST_MAPPING b/libcutils/TEST_MAPPING
index e512ab7..cca7d93 100644
--- a/libcutils/TEST_MAPPING
+++ b/libcutils/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name": "libcutils_test"
     }
+  ],
+  "hwasan-postsubmit": [
+    {
+      "name": "libcutils_test"
+    }
   ]
 }
diff --git a/libpackagelistparser/TEST_MAPPING b/libpackagelistparser/TEST_MAPPING
index 51773f9..d69a7fb 100644
--- a/libpackagelistparser/TEST_MAPPING
+++ b/libpackagelistparser/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name": "libpackagelistparser_test"
     }
+  ],
+  "hwasan-postsubmit": [
+    {
+      "name": "libpackagelistparser_test"
+    }
   ]
 }
diff --git a/libstats/pull_lazy/TEST_MAPPING b/libstats/pull_lazy/TEST_MAPPING
index 89b8c2a..92f1e6a 100644
--- a/libstats/pull_lazy/TEST_MAPPING
+++ b/libstats/pull_lazy/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name" : "libstatspull_lazy_test"
     }
+  ],
+  "hwasan-postsubmit" : [
+    {
+      "name" : "libstatspull_lazy_test"
+    }
   ]
 }
\ No newline at end of file
diff --git a/libstats/socket_lazy/TEST_MAPPING b/libstats/socket_lazy/TEST_MAPPING
index 13afc00..b182660 100644
--- a/libstats/socket_lazy/TEST_MAPPING
+++ b/libstats/socket_lazy/TEST_MAPPING
@@ -3,5 +3,10 @@
     {
       "name" : "libstatssocket_lazy_test"
     }
+  ],
+  "hwasan-postsubmit" : [
+    {
+      "name" : "libstatssocket_lazy_test"
+    }
   ]
 }
\ No newline at end of file