Files
headscale/hscontrol/servertest
Kristoffer Dalby 00c41b6422 hscontrol/servertest: add race, stress, and poll race tests
Add three test files designed to stress the control plane under
concurrent and adversarial conditions:

- race_test.go: 14 tests exercising concurrent mutations, session
  replacement, batcher contention, NodeStore access, and map response
  delivery during disconnect. All pass the Go race detector.

- poll_race_test.go: 8 tests targeting the poll.go grace period
  interleaving. These confirm a logical TOCTOU race: when a node
  disconnects and reconnects within the grace period, the old
  session's deferred Disconnect() can overwrite the new session's
  Connect(), leaving IsOnline=false despite an active poll session.

- stress_test.go: sustained churn, rapid mutations, rolling
  replacement, data integrity checks under load, and verification
  that rapid reconnects do not leak false-offline notifications.

Known failing tests (grace period TOCTOU race):
- server_state_online_after_reconnect_within_grace
- update_history_no_false_offline
- rapid_reconnect_peer_never_sees_offline
2026-03-19 07:05:58 +01:00
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