From e165f841849114780c3fdc40a1b959470d51a5e2 Mon Sep 17 00:00:00 2001
From: Vaxry <vaxry@vaxry.net>
Date: Mon, 5 Jan 2026 15:12:11 +0100
Subject: [PATCH] core/compositor: immediately do readable if adding waiter
 fails for scheduling state

---
 src/protocols/core/Compositor.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/protocols/core/Compositor.cpp b/src/protocols/core/Compositor.cpp
index b9e677af..c897bfe8 100644
--- a/src/protocols/core/Compositor.cpp
+++ b/src/protocols/core/Compositor.cpp
@@ -500,7 +500,10 @@ void CWLSurfaceResource::scheduleState(WP<SSurfaceState> state) {
 
     if (state->updated.bits.acquire) {
         // wait on acquire point for this surface, from explicit sync protocol
-        state->acquire.addWaiter([state, whenReadable]() { whenReadable(state, LOCK_REASON_FENCE); });
+        if (!state->acquire.addWaiter([state, whenReadable]() { whenReadable(state, LOCK_REASON_FENCE); })) {
+            Log::logger->log(Log::ERR, "Failed to addWaiter in CWLSurfaceResource::scheduleState");
+            whenReadable(state, LOCK_REASON_FENCE);
+        }
     } else if (state->buffer && state->buffer->isSynchronous()) {
         // synchronous (shm) buffers can be read immediately
         m_stateQueue.unlock(state);