---
id: "bug-1847"
status: "fixed"
status_updated: "2026-09-24"
status_note: ""
component: "scheduler"
severity: "unknown"
timestamp: "2026-09-24T05:30:00Z"
files: ["src/scheduler/src/scheduler.c (sched_apply_pending_config)"]
tags: ["scheduler", "recording", "replay", "config-push", "driver-equivalence"]
related: []
legacy: true
gitea_issue: 290
gitea_synced_status: "fixed"
---

# bug-1847: bug-1846 follow-up: a scheduler config push (sent by the controller on every scheduler join) was…

## Description
bug-1846 follow-up: a scheduler config push (sent by the controller on every scheduler join) was never written to a .replay recording, so a replay spanning a rejoin or a genuine config change never saw it.

## Environment
_Not recorded (migrated from buglog.json)._

## Reproduction
_Not recorded (migrated from buglog.json)._

## Root cause
handler.c applied config pushes synchronously via sched_init_config(), bypassing the pending-update queue that xce_sched_driver_translate_pending_events() records from. bug-1846's deferral moved application to a round boundary on the driver thread (main.c -> sched_apply_pending_config()), making it recordable at the right point.

## Fix
FIXED (2026-09-24, TDD). sched_apply_pending_config() now writes a CONFIG_PUSH core event via the existing sched_record_write_events() after sched_init_config() succeeds (no-op when not recording), ahead of the round's other recorded events -- matching the order they take effect. Test: test_config_push_deferred.c's test_applied_config_push_is_recorded (RED: record_event_count stayed 0; GREEN: 1 event written, stashing alone writes nothing). Known fidelity limit: replay applies configPush through core_events.c's CONFIG_PUSH path (queues/resources/resvals/configver), which does not re-run groupmgr_load_configs()/plugin_config_update()/sched_init_sharedInst() like sched_init_config() does -- a replayed config CHANGE to limits/groups still won't take effect in sim (pre-existing driver-equivalence gap, not introduced here).

## Verification
_Not recorded (migrated from buglog.json)._

## References
- Gitea: #290