diff --git a/core/java/android/app/ActivityThread.java b/core/java/android/app/ActivityThread.java
index e4455fbb9499a..60fcdc438e42b 100644
--- a/core/java/android/app/ActivityThread.java
+++ b/core/java/android/app/ActivityThread.java
@@ -3154,6 +3154,8 @@ public final class ActivityThread {
         /**
          * For system applications on userdebug/eng builds, log stack
          * traces of disk and network access to dropbox for analysis.
+         *
+         * Similar logic exists in SystemServer.java.
          */
         if ((data.appInfo.flags &
              (ApplicationInfo.FLAG_SYSTEM |
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index dffc31cff5f73..0eef06dc100b8 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -532,6 +532,17 @@ class ServerThread extends Thread {
             }
         });
 
+        // For debug builds, log event loop stalls to dropbox for analysis.
+        // Similar logic also appears in ActivityThread.java for system apps.
+        if (!"user".equals(Build.TYPE)) {
+            Slog.i(TAG, "Enabling StrictMode for system server.");
+            StrictMode.setThreadPolicy(
+                StrictMode.DISALLOW_DISK_WRITE |
+                StrictMode.DISALLOW_DISK_READ |
+                StrictMode.DISALLOW_NETWORK |
+                StrictMode.PENALTY_DROPBOX);
+        }
+
         Looper.loop();
         Slog.d(TAG, "System ServerThread is exiting!");
     }
diff --git a/services/java/com/android/server/am/ActivityManagerService.java b/services/java/com/android/server/am/ActivityManagerService.java
index 1a7e94473691b..73c1790aaf6f1 100644
--- a/services/java/com/android/server/am/ActivityManagerService.java
+++ b/services/java/com/android/server/am/ActivityManagerService.java
@@ -6592,13 +6592,19 @@ public final class ActivityManagerService extends ActivityManagerNative
      * Utility function for addErrorToDropBox and handleStrictModeViolation's logging
      * to append various headers to the dropbox log text.
      */
-    private static void appendDropBoxProcessHeaders(ProcessRecord process, StringBuilder sb) {
-        if (process == null || process.pid == MY_PID) {
-            sb.append("Process: system_server\n");
-        } else {
-            sb.append("Process: ").append(process.processName).append("\n");
-        }
-        if (process != null) {
+    private void appendDropBoxProcessHeaders(ProcessRecord process, StringBuilder sb) {
+        // Note: ProcessRecord 'process' is guarded by the service
+        // instance.  (notably process.pkgList, which could otherwise change
+        // concurrently during execution of this method)
+        synchronized (this) {
+            if (process == null || process.pid == MY_PID) {
+                sb.append("Process: system_server\n");
+            } else {
+                sb.append("Process: ").append(process.processName).append("\n");
+            }
+            if (process == null) {
+                return;
+            }
             int flags = process.info.flags;
             IPackageManager pm = AppGlobals.getPackageManager();
             sb.append("Flags: 0x").append(Integer.toString(flags, 16)).append("\n");