diff --git a/aos/ipc_lib/lockless_queue.cc b/aos/ipc_lib/lockless_queue.cc
index 6774489..45d9e16 100644
--- a/aos/ipc_lib/lockless_queue.cc
+++ b/aos/ipc_lib/lockless_queue.cc
@@ -903,7 +903,7 @@
   return message->data(memory_->message_data_size());
 }
 
-void LocklessQueueSender::Send(
+bool LocklessQueueSender::Send(
     const char *data, size_t length,
     aos::monotonic_clock::time_point monotonic_remote_time,
     aos::realtime_clock::time_point realtime_remote_time,
@@ -916,11 +916,12 @@
   // going to write an explicit chunk of memory into the buffer, we need to
   // adhere to this convention and place it at the end.
   memcpy((reinterpret_cast<char *>(Data()) + size() - length), data, length);
-  Send(length, monotonic_remote_time, realtime_remote_time, remote_queue_index,
-       monotonic_sent_time, realtime_sent_time, queue_index);
+  return Send(length, monotonic_remote_time, realtime_remote_time,
+              remote_queue_index, monotonic_sent_time, realtime_sent_time,
+              queue_index);
 }
 
-void LocklessQueueSender::Send(
+bool LocklessQueueSender::Send(
     size_t length, aos::monotonic_clock::time_point monotonic_remote_time,
     aos::realtime_clock::time_point realtime_remote_time,
     uint32_t remote_queue_index,
@@ -935,8 +936,9 @@
   // modifying it right now.
   const Index scratch_index = sender->scratch_index.RelaxedLoad();
   Message *const message = memory_->GetMessage(scratch_index);
-  CHECK(!CheckBothRedzones(memory_, message))
-      << ": Somebody wrote outside the buffer of their message";
+  if (CheckBothRedzones(memory_, message)) {
+    return false;
+  }
 
   // We should have invalidated this when we first got the buffer. Verify that
   // in debug mode.
@@ -1083,6 +1085,7 @@
   // If anybody is looking at this message (they shouldn't be), then try telling
   // them about it (best-effort).
   memory_->GetMessage(new_scratch)->header.queue_index.RelaxedInvalidate();
+  return true;
 }
 
 int LocklessQueueSender::buffer_index() const {
diff --git a/aos/ipc_lib/lockless_queue.h b/aos/ipc_lib/lockless_queue.h
index b71bd7f..a5de6cc 100644
--- a/aos/ipc_lib/lockless_queue.h
+++ b/aos/ipc_lib/lockless_queue.h
@@ -303,7 +303,7 @@
   // Note: calls to Data() are expensive enough that you should cache it.
   size_t size() const;
   void *Data();
-  void Send(size_t length,
+  bool Send(size_t length,
             aos::monotonic_clock::time_point monotonic_remote_time =
                 aos::monotonic_clock::min_time,
             aos::realtime_clock::time_point realtime_remote_time =
@@ -314,7 +314,7 @@
             uint32_t *queue_index = nullptr);
 
   // Sends up to length data.  Does not wakeup the target.
-  void Send(const char *data, size_t length,
+  bool Send(const char *data, size_t length,
             aos::monotonic_clock::time_point monotonic_remote_time =
                 aos::monotonic_clock::min_time,
             aos::realtime_clock::time_point realtime_remote_time =