From 6c7898f46dac924e966ce839d8b458170f93aa8c Mon Sep 17 00:00:00 2001
From: Ethan <39577870+ethanndickson@users.noreply.github.com>
Date: Fri, 4 Sep 2026 09:55:15 +0200
Subject: [PATCH] fix(coderd/x/chatd): avoid closing poller hint channels
 (#28746)

Closes SEC-515

Prevent a `send on closed channel` panic when a chat stream unregisters
during polling.

The poller no longer owns or closes subscriber channels. This is safe
because delivery is guarded by the stream context, and unregister
removes the subscriber from future polls.

(cherry picked from commit ced03dc30baecc9a08cef57996374dc358fcb824)
---
 coderd/x/chatd/stream_sync_poller.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/coderd/x/chatd/stream_sync_poller.go b/coderd/x/chatd/stream_sync_poller.go
index 11e9171687e..2a87a9af121 100644
--- a/coderd/x/chatd/stream_sync_poller.go
+++ b/coderd/x/chatd/stream_sync_poller.go
@@ -101,7 +101,6 @@ func (p *streamSyncPoller) unregister(subscriber *streamSyncPollerSubscriber) {
 	if len(chatSubscribers) == 0 {
 		delete(p.subscribers, subscriber.chatID)
 	}
-	close(subscriber.hints)
 }
 
 func (p *streamSyncPoller) loop() {