From b082c158fd48458af2ea64349f726b5405595572 Mon Sep 17 00:00:00 2001
From: ospab <ospab@ospab.host>
Date: Fri, 15 May 2026 20:04:07 +0300
Subject: [PATCH] fix: throw error on ARQ max_retries exceeded to prevent
 silent deadlock that caused infinite upload timeouts

---
 ostp-core/src/protocol.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ostp-core/src/protocol.rs b/ostp-core/src/protocol.rs
index 6a9affe..9336b84 100644
--- a/ostp-core/src/protocol.rs
+++ b/ostp-core/src/protocol.rs
@@ -417,7 +417,8 @@ impl ProtocolMachine {
         let now = Instant::now();
         for frame in self.sent_history.iter_mut() {
             if frame.retries >= self.max_retries {
-                continue;
+                tracing::error!("FATAL: Frame {} exceeded max retries ({}). Connection is dead.", frame.nonce, self.max_retries);
+                return Err(ProtocolError::State("connection dead, max retries exceeded".into()));
             }
             if now.duration_since(frame.last_sent) >= self.rto {
                 frame.last_sent = now;