Describe the bug
ClickHouse use getaddrinfo for reverse resolve https://github.com/ClickHouse/ClickHouse/blob/master/src/Common/DNSResolver.cpp#L124

DNS protocol doesn't restrict how much PTR records we shall set for one IP address
https://en.wikipedia.org/wiki/Reverse_DNS_lookup#Multiple_pointer_records

so, when we receive multiple PTR response value
only one PTR response value apply for <host_regexp> recognition

How to reproduce
I create a docker-compose reproducible environment
https://gist.github.com/Slach/f9e40984168840d9c95da03988ab8283
just run ./reproduce.sh

• Which ClickHouse server version to use
  official docker clickhouse-server:latest

Expected behavior
All PTR response shall match with host_regexp pattern

Error message and/or stacktrace

Code: 516, e.displayText() = DB::Exception: test_dns: Authentication failed: password is incorrect or there is no user with such name (version 20.1'.3.3 (official build)