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Fix this issue follow these two points: 1. Keep track of how many queries are currently open. If `setServers()` is called while there are open queries, error out. 2. For `Resolver` instances, use option 1. For dns.setServers(), just create a fresh new default channel every time it is called, and then set its servers list. PR-URL: https://github.com/nodejs/node/pull/14891 Fixes: https://github.com/nodejs/node/issues/14734 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Tobias Nießen <tniessen@tnie.de>