diff --git a/staticlibs/testutils/devicetests/com/android/testutils/NatPacketForwarderBase.java b/staticlibs/testutils/devicetests/com/android/testutils/NatPacketForwarderBase.java
index 85c6493..0a2b5d4 100644
--- a/staticlibs/testutils/devicetests/com/android/testutils/NatPacketForwarderBase.java
+++ b/staticlibs/testutils/devicetests/com/android/testutils/NatPacketForwarderBase.java
@@ -151,7 +151,8 @@
     private void processPacket() {
         final int len = PacketReflectorUtil.readPacket(mSrcFd, mBuf);
         if (len < 1) {
-            throw new IllegalStateException("Unexpected buffer length: " + len);
+            // Usually happens when socket read is being interrupted, e.g. stopping PacketForwarder.
+            return;
         }
 
         final int version = mBuf[0] >>> 4;
diff --git a/staticlibs/testutils/devicetests/com/android/testutils/PacketReflectorUtil.kt b/staticlibs/testutils/devicetests/com/android/testutils/PacketReflectorUtil.kt
index b028045..498b1a3 100644
--- a/staticlibs/testutils/devicetests/com/android/testutils/PacketReflectorUtil.kt
+++ b/staticlibs/testutils/devicetests/com/android/testutils/PacketReflectorUtil.kt
@@ -20,11 +20,12 @@
 
 import android.system.ErrnoException
 import android.system.Os
+import android.system.OsConstants
 import com.android.net.module.util.IpUtils
 import com.android.testutils.PacketReflector.IPV4_HEADER_LENGTH
 import com.android.testutils.PacketReflector.IPV6_HEADER_LENGTH
 import java.io.FileDescriptor
-import java.io.IOException
+import java.io.InterruptedIOException
 import java.net.InetAddress
 import java.nio.ByteBuffer
 
@@ -32,8 +33,15 @@
     return try {
         Os.read(fd, buf, 0, buf.size)
     } catch (e: ErrnoException) {
-        -1
-    } catch (e: IOException) {
+        // Ignore normal use cases such as the EAGAIN error indicates that the read operation
+        // cannot be completed immediately, or the EINTR error indicates that the read
+        // operation was interrupted by a signal.
+        if (e.errno == OsConstants.EAGAIN || e.errno == OsConstants.EINTR) {
+            -1
+        } else {
+            throw e
+        }
+    } catch (e: InterruptedIOException) {
         -1
     }
 }