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ProductionTracked since May 21, 2026

Stop multi-session shared-server crashes by fixing event fanout and malformed-frame handling

A single pull request addresses the root cause of mass session failures on shared-server by replacing fragile single-writer fallback behavior with safer fanout over active connections, preventing protocol events from being sent to the wrong client stream when multiple TUIs are attached; it also adds guarded handling for malformed JSON frames so one bad frame does not instantly abort all sessions.

shared-servermulti-session protocolmember.event_txmember.event_txs

Signal Intelligence

Confidence Level96%
Worth Continued TrackingFinal score 82% with 1 evidence item.
Primary Impact Areas
shared-servermulti-session protocolmember.event_tx

What Happened

  • A single pull request addresses the root cause of mass session failures on shared-server by replacing fragile single-writer fallback behavior with safer fanout over active connections, preventing protocol events from being sent to the wrong client stream when multiple TUIs are attached; it also adds guarded handling for malformed JSON frames so one bad frame does not instantly abort all sessions.
  • A single pull request addresses the root cause of mass session failures on shared-server by replacing fragile single-writer fallback behavior with safer fanout over active connections, preventing protocol events from being sent to the wrong client stream when multiple TUIs are attached; it also adds guarded handling for malformed JSON frames so one bad frame does not instantly abort all sessions.
  • 1 evidence item attached for review.

What is Different

Before

Scattered source updates, isolated context, and manual follow-up across multiple feeds.

Now

Prevented cross-connection protocol corruption by only adopting a singular fallback sender when it is closed, retaining per-connection fanout semantics during register/unregister/send paths, and by making the protocol parser/logging path strip invalid newline-only JSON artifacts and resync at the next newline (up to 16 consecutive corrupt frames) instead of treating one malformed frame as fatal.

Why Track This

Why It Matters

Operators running multiple attached clients on the shared-server can avoid all connected TUIs dropping together from one malformed event, so collaborative sessions remain usable during long debugging or workflow windows instead of forcing broad reconnects after sudden disconnect storms. The server now avoids rewiring to stale/incorrect writers during concurrent session activity and handles isolated frame corruption as recoverable, so the immediate practical benefit is fewer full-session outages; watch for any remaining code paths that still assume one global fallback sender and monitor repeated malformed-frame sequences for an upstream formatting regression.

Impact

Operators running multiple attached clients on the shared-server can avoid all connected TUIs dropping together from one malformed event, so collaborative sessions remain usable during long debugging or workflow windows instead of forcing broad reconnects after sudden disconnect storms. The server now avoids rewiring to stale/incorrect writers during concurrent session activity and handles isolated frame corruption as recoverable, so the immediate practical benefit is fewer full-session outages; watch for any remaining code paths that still assume one global fallback sender and monitor repeated malformed-frame sequences for an upstream formatting regression.

What To Watch Next

  • Watch whether shared-server becomes a repeated pattern.
  • Track follow-up changes around AI Debugging and Error Localization.
  • Compare future signals against this evidence trail.
  • Re-check risk flags: global_fallback_sender_dependency, concurrent_session_registration_paths.
Open Topic TimelineOpen Technical EventOpen Original Sourceglobal_fallback_sender_dependency / concurrent_session_registration_paths / malformed_frame_retries_exhaustion

Supporting Evidence

GITHUB PULL REQUESTHigh Trust

1jehuang/jcode PR #256: fix(server): eliminate multi-session protocol corruption

Fixes `RemoteConnection::next_event: protocol error=expected value at line 1 column 1` / `Remote protocol error is not retryable` cascades by removing `member.event_tx` overwrite behavior and routing event delivery through `fanout_session_event` with bounded malformed-frame recovery.