diff --git a/fs_mgr/fs_mgr_remount.cpp b/fs_mgr/fs_mgr_remount.cpp
index 631273457..5c4008cce 100644
--- a/fs_mgr/fs_mgr_remount.cpp
+++ b/fs_mgr/fs_mgr_remount.cpp
@@ -263,35 +263,43 @@ int main(int argc, char* argv[]) {
 
     // Check verity and optionally setup overlayfs backing.
     auto reboot_later = false;
+    auto uses_overlayfs = fs_mgr_overlayfs_valid() != OverlayfsValidResult::kNotSupported;
     for (auto it = partitions.begin(); it != partitions.end();) {
         auto& entry = *it;
         auto& mount_point = entry.mount_point;
         if (fs_mgr_is_verity_enabled(entry)) {
-            LOG(WARNING) << "Verity enabled on " << mount_point;
-            if (can_reboot &&
-                (android::base::GetProperty("ro.boot.vbmeta.devices_state", "") != "locked")) {
+            retval = VERITY_PARTITION;
+            if (android::base::GetProperty("ro.boot.vbmeta.devices_state", "") != "locked") {
                 if (AvbOps* ops = avb_ops_user_new()) {
                     auto ret = avb_user_verity_set(
                             ops, android::base::GetProperty("ro.boot.slot_suffix", "").c_str(),
                             false);
                     avb_ops_user_free(ops);
                     if (ret) {
-                        if (fs_mgr_overlayfs_valid() == OverlayfsValidResult::kNotSupported) {
-                            retval = VERITY_PARTITION;
+                        LOG(WARNING) << "Disable verity for " << mount_point;
+                        reboot_later = can_reboot;
+                        if (reboot_later) {
                             // w/o overlayfs available, also check for dedupe
-                            reboot_later = true;
-                            ++it;
-                            continue;
+                            if (!uses_overlayfs) {
+                                ++it;
+                                continue;
+                            }
+                            reboot(false);
                         }
-                        reboot(false);
                     } else if (fs_mgr_set_blk_ro(entry.blk_device, false)) {
                         fec::io fh(entry.blk_device.c_str(), O_RDWR);
-                        if (fh && fh.set_verity_status(false)) reboot_later = true;
+                        if (fh && fh.set_verity_status(false)) {
+                            LOG(WARNING) << "Disable verity for " << mount_point;
+                            reboot_later = can_reboot;
+                            if (reboot_later && !uses_overlayfs) {
+                                ++it;
+                                continue;
+                            }
+                        }
                     }
                 }
             }
             LOG(ERROR) << "Skipping " << mount_point;
-            retval = VERITY_PARTITION;
             it = partitions.erase(it);
             continue;
         }
@@ -318,7 +326,8 @@ int main(int argc, char* argv[]) {
     }
 
     // Mount overlayfs.
-    if (!fs_mgr_overlayfs_mount_all(&partitions)) {
+    errno = 0;
+    if (!fs_mgr_overlayfs_mount_all(&partitions) && errno) {
         retval = BAD_OVERLAY;
         PLOG(ERROR) << "Can not mount overlayfs for partitions";
     }
@@ -346,11 +355,15 @@ int main(int argc, char* argv[]) {
                 break;
             }
             if ((mount_point == "/") && (rentry.mount_point == "/system")) {
-                if (blk_device != "/dev/root") blk_device = rentry.blk_device;
+                blk_device = rentry.blk_device;
                 mount_point = "/system";
                 break;
             }
         }
+        if (blk_device == "/dev/root") {
+            auto from_fstab = GetEntryForMountPoint(&fstab, mount_point);
+            if (from_fstab) blk_device = from_fstab->blk_device;
+        }
         fs_mgr_set_blk_ro(blk_device, false);
 
         // Now remount!
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index a6baf1d32..bd5a4fe58 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -48,6 +48,7 @@ NORMAL="${ESCAPE}[0m"
 TMPDIR=${TMPDIR:-/tmp}
 print_time=false
 start_time=`date +%s`
+ACTIVE_SLOT=
 
 ##
 ##  Helper Functions
@@ -77,6 +78,7 @@ inAdb() {
       wc -l | grep '^1$' >/dev/null
     fi
 }
+
 [ "USAGE: inRecovery
 
 Returns: true if device is in recovery mode" ]
@@ -221,15 +223,23 @@ format_duration() {
 
 Returns: waits until the device has returned for adb or optional timeout" ]
 adb_wait() {
+  local ret
   if [ -n "${1}" ]; then
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} "${CR}"
     timeout --preserve-status --signal=KILL ${1} adb wait-for-device 2>/dev/null
-    local ret=${?}
+    ret=${?}
     echo -n "                                                                             ${CR}"
-    return ${ret}
   else
     adb wait-for-device
+    ret=${?}
   fi
+  if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
+    local active_slot=`get_active_slot`
+    if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
+      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+    fi
+  fi
+  return ${ret}
 }
 
 [ "USAGE: usb_status > stdout
@@ -254,33 +264,50 @@ usb_status() {
 
 Returns: waits until the device has returned for fastboot or optional timeout" ]
 fastboot_wait() {
+  local ret
   # fastboot has no wait-for-device, but it does an automatic
   # wait and requires (even a nonsensical) command to do so.
   if [ -n "${1}" ]; then
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} "${CR}"
     timeout --preserve-status --signal=KILL ${1} fastboot wait-for-device >/dev/null 2>/dev/null
-    local ret=${?}
+    ret=${?}
     echo -n "                                                                             ${CR}"
     ( exit ${ret} )
   else
     fastboot wait-for-device >/dev/null 2>/dev/null
   fi ||
     inFastboot
+  ret=${?}
+  if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
+    local active_slot=`get_active_slot`
+    if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
+      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+    fi
+  fi
+  return ${ret}
 }
 
 [ "USAGE: recovery_wait [timeout]
 
 Returns: waits until the device has returned for recovery or optional timeout" ]
 recovery_wait() {
+  local ret
   if [ -n "${1}" ]; then
     echo -n ". . . waiting `format_duration ${1}`" ${ANDROID_SERIAL} ${USB_ADDRESS} "${CR}"
     timeout --preserve-status --signal=KILL ${1} adb wait-for-recovery 2>/dev/null
-    local ret=${?}
+    ret=${?}
     echo -n "                                                                             ${CR}"
-    return ${ret}
   else
     adb wait-for-recovery
+    ret=${?}
   fi
+  if [ 0 = ${ret} -a -n "${ACTIVE_SLOT}" ]; then
+    local active_slot=`get_active_slot`
+    if [ X"${ACTIVE_SLOT}" != X"${active_slot}" ]; then
+      echo "${ORANGE}[  WARNING ]${NORMAL} Active slot changed from ${ACTIVE_SLOT} to ${active_slot}" >&2
+    fi
+  fi
+  return ${ret}
 }
 
 [ "any_wait [timeout]
@@ -326,7 +353,7 @@ adb_unroot() {
     [ root != "`adb_sh echo '${USER}' </dev/null`" ]
 }
 
-[ "USAGE: fastboot_getvar var expected
+[ "USAGE: fastboot_getvar var expected >/dev/stderr
 
 Returns: true if var output matches expected" ]
 fastboot_getvar() {
@@ -350,6 +377,19 @@ fastboot_getvar() {
   echo ${O} >&2
 }
 
+[ "USAGE: get_active_slot >/dev/stdout
+
+Returns: with a or b string reporting active slot" ]
+get_active_slot() {
+  if inAdb || inRecovery; then
+    get_property ro.boot.slot_suffix | tr -d _
+  elif inFastboot; then
+    fastboot_getvar current-slot 2>&1 | sed -n 's/current-slot: //p'
+  else
+    false
+  fi
+}
+
 [ "USAGE: restore
 
 Do nothing: should be redefined when necessary.  Called after cleanup.
@@ -583,6 +623,9 @@ fi
 BUILD_DESCRIPTION=`get_property ro.build.description`
 [ -z "${BUILD_DESCRIPTION}" ] ||
   echo "${BLUE}[     INFO ]${NORMAL} ${BUILD_DESCRIPTION}" >&2
+ACTIVE_SLOT=`get_active_slot`
+[ -z "${ACTIVE_SLOT}" ] ||
+  echo "${BLUE}[     INFO ]${NORMAL} active slot is ${ACTIVE_SLOT}" >&2
 
 # Report existing partition sizes
 adb_sh ls -l /dev/block/by-name/ </dev/null 2>/dev/null |
@@ -1031,13 +1074,7 @@ else
   check_eq "${A}" "${B}" system after flash vendor
   adb_root ||
     die "adb root"
-  B="`adb_cat /vendor/hello`" &&
-    if ${is_userspace_fastboot} || ! ${overlayfs_needed}; then
-      die "re-read /vendor/hello after flash vendor"
-    else
-      echo "${ORANGE}[  WARNING ]${NORMAL} user fastboot missing required to invalidate, ignoring a failure" >&2
-      echo "${ORANGE}[  WARNING ]${NORMAL} re-read /vendor/hello after flash vendor" >&2
-    fi
+  B="`adb_cat /vendor/hello`"
   if ${is_userspace_fastboot} || ! ${overlayfs_needed}; then
     check_eq "cat: /vendor/hello: No such file or directory" "${B}" \
              vendor content after flash vendor