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reuseOAuthFlow read flow, expiresAt, waitCancel and info without holding s.mutex, while startSSOLogin and WaitSSOLogin write them under it. Reading the fields one at a time could also answer with auth info from a flow that was already replaced, or cancel a wait that no longer belongs to the flow just judged stale. Take one snapshot under the lock and decide from it. WaitSSOLogin read oauthAuthFlow.flow twice outside the lock; both now use a value snapshotted in the critical section that already installs actCancel. Its stale waitCancel was read and called in a separate section from the one installing the new one, so two racing calls could read the same predecessor and leave one wait uncancelled. Swap the two in a single critical section. Both cancels run after unlocking: the displaced wait takes s.mutex as it unwinds.