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Chris LuandGitHub
fe0a357624
On renewal failure the renew goroutine stored isLocked=false before its deferred renewGoroutineRunning.Store(false) ran. A concurrent RequestLock interleaving there reacquires the lease (sees isLocked=false), sets isLocked=true, then its CompareAndSwap on renewGoroutineRunning fails because the old goroutine's flag is still set — so no replacement renewer starts. The lock is then held locally with nothing renewing it, and silently expires on the master after the lease TTL, admitting a second holder. Clear renewGoroutineRunning before isLocked on the failure path so the reacquire path always starts a fresh renewer. Builds and vets clean; no behavior change on the success path. Claude-Session: https://claude.ai/code/session_01Ks16jnt4S7gdDk8cheQ3xu