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coalesce concurrent session spawns onto one future (T-374)

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Orchestrator.spawn() check-then-acts on the session registry across
two awaits (transcript-tail read, process start) — two racing callers
for the same id both passed the check and the loser's live claude
process was orphaned, never killed, never observed. The first caller
now installs the spawn future synchronously; later callers await the
same future, and a failed spawn clears the entry so a retry proceeds.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
jpmschweitzer
2026-06-12 01:08:33 +02:00
co-authored by Claude Fable 5
parent 5d9443d9f7
commit 51957eb0ac
5 changed files with 65 additions and 1 deletions
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.pql/changelog/ticket_history/2026-06.sql
+2
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@@ -3999,3 +3999,5 @@ INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, chang
INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FBHD098CV2N73823KX4Z99P4', 'status', 'in_progress', 'done', NULL, '2026-06-11 23:04:46', '2026-06-11 23:04:46', '2026-06-11 23:04:46', NULL, '5d8d8c7a17da4894510db957e7af3c3f', 2) ON CONFLICT(hash) DO NOTHING;
INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FBHCP03EJ9CDBGZGRPD19N8W', 'status', 'backlog', 'in_progress', NULL, '2026-06-11 23:05:16', '2026-06-11 23:05:16', '2026-06-11 23:05:16', NULL, '252a8c28446f3c86876ec826fce03987', 2) ON CONFLICT(hash) DO NOTHING;
INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FBHCP03EJ9CDBGZGRPD19N8W', 'status', 'in_progress', 'done', NULL, '2026-06-11 23:06:26', '2026-06-11 23:06:26', '2026-06-11 23:06:26', NULL, '4e1cc82f703d717f7592890e230caf00', 2) ON CONFLICT(hash) DO NOTHING;
INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FBHC90B72A270CAKA7AP1ZX8', 'status', 'backlog', 'in_progress', NULL, '2026-06-11 23:07:01', '2026-06-11 23:07:01', '2026-06-11 23:07:01', NULL, '795c139edb5acd0d2a187dac6a3066c7', 2) ON CONFLICT(hash) DO NOTHING;
INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FBHC90B72A270CAKA7AP1ZX8', 'status', 'in_progress', 'done', NULL, '2026-06-11 23:08:13', '2026-06-11 23:08:13', '2026-06-11 23:08:13', NULL, 'f83a2fc13f3839070957bea6ac7fdc5f', 2) ON CONFLICT(hash) DO NOTHING;
.pql/changelog/tickets/2026-06.sql
+10
View File
@@ -4099,3 +4099,13 @@ INSERT INTO tickets (record_id, type, parent_record_id, title, description, stat
Fix: pass the active workspace root as the spawn cwd (and re-derive it on project switch for new panes).
Acceptance: test that a terminal pane''s SpawnSpec.cwd equals the workspace root, not Directory.current.', 'done', 'medium', NULL, NULL, NULL, '2026-06-11 21:59:42', '2026-06-11 23:06:26', NULL, '8cad068c28a7a0cb6772a5fbdcbc34c3', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
INSERT INTO tickets (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FBHC90B72A270CAKA7AP1ZX8', 'bug', '06FBHBGHNEQTAEPGNJKN42C1E8', 'Orchestrator.spawn() races itself — concurrent spawns for one id leak a live claude process', 'lib/builtin/claude/src/session_orchestrator.dart:191-249 — spawn() does check-then-act on the sessions map across two awaits (transcript-tail read, process start). Two concurrent spawns for the same session id both pass the check; the loser''s live claude process is orphaned, never killed, never observed.
Fix: hold a Map<String, Future<ManagedSession>> — first caller installs the future synchronously, later callers await the same future; remove the entry on failure.
Acceptance: test issuing two concurrent spawn() calls for one id yields the same ManagedSession instance and exactly one process spawn (count via injected spawner); failure path clears the in-flight entry so a retry can proceed.', 'in_progress', 'medium', NULL, NULL, NULL, '2026-06-11 21:57:56', '2026-06-11 23:07:01', NULL, 'f2df2148315332d48e2bf66cc2942bd3', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
INSERT INTO tickets (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FBHC90B72A270CAKA7AP1ZX8', 'bug', '06FBHBGHNEQTAEPGNJKN42C1E8', 'Orchestrator.spawn() races itself — concurrent spawns for one id leak a live claude process', 'lib/builtin/claude/src/session_orchestrator.dart:191-249 — spawn() does check-then-act on the sessions map across two awaits (transcript-tail read, process start). Two concurrent spawns for the same session id both pass the check; the loser''s live claude process is orphaned, never killed, never observed.
Fix: hold a Map<String, Future<ManagedSession>> — first caller installs the future synchronously, later callers await the same future; remove the entry on failure.
Acceptance: test issuing two concurrent spawn() calls for one id yields the same ManagedSession instance and exactly one process spawn (count via injected spawner); failure path clears the in-flight entry so a retry can proceed.', 'done', 'medium', NULL, NULL, NULL, '2026-06-11 21:57:56', '2026-06-11 23:08:13', NULL, 'fde3f9e912ea1d25256003ef56dcf491', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);