Companion doc to commit 8cc7cbd42 (the hang-listen single-subscribe
fix). Captures:
- Pre-fix root cause: moq-rs cancel cascade. Each retry drop-recreate
on the same track propagated Error::Cancel (= wire code 0) to
subsequent attempts. Sweep was 5/5 fail.
- Fix: hold ONE subscription open for the full 10 s catalog-read
budget. Inner timeouts on .next() poll for the first group; outer
timeout caps total wait. Eliminates the cancel-cascade. Sweep 2/5
pass post-fix.
- Residual root cause: unidentified. Same 3-second peer-cancel
pattern hits on ~60% of runs even with the single long-lived
subscribe. Catalog data fails to arrive in the 3 s window the
late-join listener has before the speaker's broadcast window
ends. Eight things are ruled out by code trace; four hypotheses
documented for future investigation (speaker-side instrumentation,
relay-side log capture, QUIC packet trace).
No production code change; test-only Rust patch already shipped.
Claude
8e51e1bab2