39 lines
4.4 KiB
Plaintext
39 lines
4.4 KiB
Plaintext
[INFO] VERDICT: The contradiction is an illusion caused by assuming the agent's read path is monolithic. The read loop is actively pulling bytes (handling Pings), but the command dispatch path has silently failed (likely a panicked task or dropped channel).
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Confidence: High. The combination of TCP ACKs and successful WS Pong responses strictly requires the agent's WebSocket read loop to be actively polling the socket.
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Here is the independent review of your questions:
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### 1. Agent-side mechanisms (Ranked)
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[OK] **Rank 1: Panicked/Dead Worker Task (Channel Disconnect).**
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The WS read loop is actively running (calling `.next()` or `.read()`), which allows the underlying library (e.g., `tungstenite`) to automatically process Pings and send Pongs. When a Text frame arrives, the loop attempts to send it over an internal channel (e.g., `mpsc`) to a command-executor task. If that executor task panicked or died, the channel is closed. The read loop receives a `SendError`, ignores it (or logs it, which we can't see), and loops back to read the next frame.
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[WARN] **Rank 2: Logic Bug / State Desync in 0.6.63 Router.**
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The agent reads the Text frame, but an internal state machine believes it is not authenticated or not ready, and silently drops the frame.
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[ERROR] **Rank 3: TLS/WS Reassembly Desync.**
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Refuted. A desync at the TLS or WS frame level would corrupt the stream, causing protocol errors and connection termination. It would not cleanly drop Text frames while perfectly parsing Ping frames.
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### 2. Is "kernel ACKs but app stopped reading" plausible?
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[ERROR] VERDICT: REFUTED.
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If the application had completely stopped reading (e.g., blocked thread or deadlocked read loop), the kernel would ACK packets until the TCP receive window filled up (zero-window). **However, this cannot explain the Pings.** Pings are WebSocket control frames inside the TLS tunnel. For the server to receive Pongs, the agent application *must* be continuously decrypting TLS records and parsing WS frames. The application has not stopped reading; it is selectively ignoring or failing to process the payload of the Text frames.
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### 3. Non-Agent Explanations (Middleboxes, Offload)
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[WARN] **TLS Inspection / Deep Packet Inspection (Middlebox):**
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Plausible, but unlikely. If the agent's site uses a corporate firewall with TLS MITM (terminating TLS with a trusted root cert), the firewall could theoretically parse WS frames and drop Text payloads it deems malicious (e.g., matching a C2 signature) while passing Pings.
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[ERROR] **GRO/LRO/TSO Offload Corruption:**
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Refuted. Hardware offload corrupts IP/TCP headers or checksums, leading to packet drops at the kernel level. It does not perfectly reassemble TLS, parse WS framing, and selectively drop application Text frames.
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[ERROR] **TCP Proxy without MITM:**
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Refuted. A transparent TCP proxy might ACK the packet early, but if it fails to deliver the payload to the agent, the agent's WS stream would eventually stall, and Pings would stop working.
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### 4. The Single Most Decisive Next Test
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[INFO] VERDICT: **Server-side connection eviction (Force disconnect).**
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Kill the specific TCP connection for one of the affected agents (e.g., drop it at NPM, or push a disconnect command from the Rust server's internal state to force a socket close).
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**Reasoning:**
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This forces the agent to establish a completely fresh TCP/TLS/WS session and spawns fresh asynchronous tasks on the agent side.
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* If commands **succeed** immediately after reconnect: It definitively proves the issue is a transient state corruption, deadlock, or panicked task inside the agent software (0.6.63) that accumulates over time.
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* If commands **still fail** (but pings work): It heavily points to a persistent middlebox/firewall dropping the payload, or a deterministic bug triggered immediately upon connection in 0.6.63.
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### 5. Significance of "worked at 22:23 right after update, never since"
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[INFO] VERDICT: This strongly supports the "panicked worker task" or "deadlock" hypothesis.
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The agent successfully connected, initialized, and processed exactly *one* command. The processing of that first command (or a background task spawned shortly after, like the log-uploader) likely triggered a panic or a permanent channel deadlock in the new 0.6.63 codebase. Once that specific task died, the read loop remained alive (answering Pings), but all subsequent Text frames routed to that dead task are now being dropped into the void.
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