# Flake ledger

Tests that have failed nondeterministically, with mechanism notes and hardening
status. Discipline: **any flake gets an entry, not a shrug** — a second
occurrence upgrades the entry from "observed" to "harden it." Rig flakes from
the two-host ladder (docs/TWO-HOST-RUNBOOK.md) land here too.

| # | test | occurrences | mechanism | status |
|---|------|-------------|-----------|--------|
| 1 | `spt-daemon brain_restart_survives_gaplessly` | 1× hosted Windows (2026-06-03, hung) | ConPTY stall under hosted-runner load | job `timeout-minutes` bounds it; not seen self-hosted |
| 2 | `spt-term digest_parses_a_real_pty_stream` | 3× gravity (2026-06-03; 2026-06-04 runs 26957386850, 26966738231) | sprint-collapse assert (`digest.rs`) — PTY input echo and the child's write are **concurrent writers** into the master-read stream; back-to-back `send_line`s let a later line's echo interleave mid-`Write(…)`, breaking the tool regex for that turn | HARDENED (2026-06-04): sends serialized — each line pumped back (adaptive echo-copy count, 2s/line bound) before the next, so no concurrent writer races an earlier line; failure asserts now print the raw transcript |
| 3 | `spt-daemon sync.rs torn_pull` + `concurrent_writes` | 1× (2026-06-03) | `wait_for_stream` deadline too tight under load | HARDENED: `wait_for_stream_except` 2s→10s; no recurrence |
| 4 | `spt-live context::write_context_suppresses_stale_llm` | 1× gravity (2026-06-04 run 26967808321) | test calls `write_context` (reads SPT_HOME node identity + epoch stamp) WITHOUT the `with_home` lock — a parallel `with_home` test's env swap + temp-dir teardown races the stamp's epoch write into a deleted home (`NotFound`) | HARDENED (2026-06-04): test wrapped in `with_home` — serializes on the home lock like every other SPT_HOME-touching test |