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hsbt
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cjwatson
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In certain configurations it's possible to get duplicate results back
from getaddrinfo: for example, if you accidentally have more than one
line in /etc/hosts mapping the same name to the same IP address, then
Linux/glibc systems will return multiple identical entries. This minor
misconfiguration is normally harmless, but it caused this program to
fail with `EADDRINUSE`:
require 'socket'
Socket.tcp_server_sockets('localhost', 0)
Prior to ruby/net-http#180, this caused a number
of `TestNetHTTP*` tests to fail, as seen in these Debian bugs:
https://bugs.debian.org/1069399 (Ruby 3.1)
https://bugs.debian.org/1064685 (Ruby 3.2)
https://bugs.debian.org/1077462 (Ruby 3.3)
It's easy enough to deduplicate these.
rhenium
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Dec 13, 2025
GitHub PR ruby#180 removed the WEBrick usage in net/http tests.
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