https://git.ruby-lang.org/ruby.git/commit/?id=83c255e89f

From 83c255e89f376068f632fc1f17e67253184e4451 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 3 Jul 2021 16:56:34 +0000
Subject: merge revision(s) 9edc1625: [Backport #17781]

	[ruby/resolv] Fix confusion of received response message

	This is a follow up for commit 33fb966197f1 ("Remove sender/message_id
	pair after response received in resolv", 2020-09-11).

	As the @senders instance variable is also used for tracking transaction
	ID allocation, simply removing an entry without releasing the ID would
	eventually deplete the ID space and cause
	Resolv::DNS.allocate_request_id to hang.

	It seems the intention of the code was to check that the received DNS
	message is actually the response for the question made within the method
	earlier. Let's have it actually do so.

	[Bug #12838] https://bugs.ruby-lang.org/issues/12838
	[Bug #17748] https://bugs.ruby-lang.org/issues/17748

	https://github.com/ruby/resolv/commit/53ca9c9209
	---
	 lib/resolv.rb | 6 +++---
	 1 file changed, 3 insertions(+), 3 deletions(-)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67946 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/resolv.rb | 6 +++---
 version.h     | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/resolv.rb b/lib/resolv.rb
index 93b57c6..02c2ded 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -691,17 +691,17 @@ class Resolv https://github.com/ruby/ruby/blob/trunk/lib/resolv.rb#L691
           rescue DecodeError
             next # broken DNS message ignored
           end
-          if s = sender_for(from, msg)
+          if sender == sender_for(from, msg)
             break
           else
             # unexpected DNS message ignored
           end
         end
-        return msg, s.data
+        return msg, sender.data
       end
 
       def sender_for(addr, msg)
-        @senders.delete([addr,msg.id])
+        @senders[[addr,msg.id]]
       end
 
       def close
diff --git a/version.h b/version.h
index 31a7605..e6003c2 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.6.8"
 #define RUBY_RELEASE_DATE "2021-07-04"
-#define RUBY_PATCHLEVEL 201
+#define RUBY_PATCHLEVEL 202
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 7
-- 
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