世界 aba8346bd6 Fix DNS cache lock goroutine leak ...

The cache deduplication in Client.Exchange uses a channel-based lock
per DNS question. Waiting goroutines blocked on <-cond without context
awareness, causing them to accumulate indefinitely when the owning
goroutine's transport call stalls. Add select on ctx.Done() so waiters
respect context cancellation and timeouts.

2026-02-06 22:28:35 +08:00

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