diff --git a/debuggerd/libdebuggerd/utility.cpp b/debuggerd/libdebuggerd/utility.cpp
index d71fc6c..15f09b3 100644
--- a/debuggerd/libdebuggerd/utility.cpp
+++ b/debuggerd/libdebuggerd/utility.cpp
@@ -382,8 +382,10 @@
           return "SEGV_MTEAERR";
         case SEGV_MTESERR:
           return "SEGV_MTESERR";
+        case SEGV_CPERR:
+          return "SEGV_CPERR";
       }
-      static_assert(NSIGSEGV == SEGV_MTESERR, "missing SEGV_* si_code");
+      static_assert(NSIGSEGV == SEGV_CPERR, "missing SEGV_* si_code");
       break;
     case SIGSYS:
       switch (si->si_code) {
diff --git a/fs_mgr/libsnapshot/snapshot.cpp b/fs_mgr/libsnapshot/snapshot.cpp
index eb4beb7..c639e43 100644
--- a/fs_mgr/libsnapshot/snapshot.cpp
+++ b/fs_mgr/libsnapshot/snapshot.cpp
@@ -3513,6 +3513,11 @@
             return Return::Error();
         }
 
+        if (!android::fs_mgr::WaitForFile(cow_path, 6s)) {
+            LOG(ERROR) << "Timed out waiting for device to appear: " << cow_path;
+            return Return::Error();
+        }
+
         if (it->second.using_snapuserd()) {
             unique_fd fd(open(cow_path.c_str(), O_RDWR | O_CLOEXEC));
             if (fd < 0) {
diff --git a/init/property_service.cpp b/init/property_service.cpp
index b08a904..9ae9990 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -76,6 +76,10 @@
 #include "system/core/init/property_service.pb.h"
 #include "util.h"
 
+static constexpr char APPCOMPAT_OVERRIDE_PROP_FOLDERNAME[] =
+        "/dev/__properties__/appcompat_override";
+static constexpr char APPCOMPAT_OVERRIDE_PROP_TREE_FILE[] =
+        "/dev/__properties__/appcompat_override/property_info";
 using namespace std::literals;
 
 using android::base::ErrnoError;
@@ -1279,11 +1283,17 @@
         return;
     }
 
-    constexpr static const char kPropertyInfosPath[] = "/dev/__properties__/property_info";
-    if (!WriteStringToFile(serialized_contexts, kPropertyInfosPath, 0444, 0, 0, false)) {
+    if (!WriteStringToFile(serialized_contexts, PROP_TREE_FILE, 0444, 0, 0, false)) {
         PLOG(ERROR) << "Unable to write serialized property infos to file";
     }
-    selinux_android_restorecon(kPropertyInfosPath, 0);
+    selinux_android_restorecon(PROP_TREE_FILE, 0);
+
+    mkdir(APPCOMPAT_OVERRIDE_PROP_FOLDERNAME, S_IRWXU | S_IXGRP | S_IXOTH);
+    if (!WriteStringToFile(serialized_contexts, APPCOMPAT_OVERRIDE_PROP_TREE_FILE, 0444, 0, 0,
+                           false)) {
+        PLOG(ERROR) << "Unable to write vendor overrides to file";
+    }
+    selinux_android_restorecon(APPCOMPAT_OVERRIDE_PROP_TREE_FILE, 0);
 }
 
 static void ExportKernelBootProps() {
diff --git a/property_service/libpropertyinfoparser/include/property_info_parser/property_info_parser.h b/property_service/libpropertyinfoparser/include/property_info_parser/property_info_parser.h
index 0548021..65705ac 100644
--- a/property_service/libpropertyinfoparser/include/property_info_parser/property_info_parser.h
+++ b/property_service/libpropertyinfoparser/include/property_info_parser/property_info_parser.h
@@ -20,6 +20,8 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+static constexpr char PROP_TREE_FILE[] = "/dev/__properties__/property_info";
+
 namespace android {
 namespace properties {