https://git.ruby-lang.org/ruby.git/commit/?id=d416205341

From d4162053410782a449e0921ee7222e7ce3deca6f Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Sat, 15 Oct 2022 01:45:51 +1300
Subject: Copy `IO#timeout` on `IO#dup`. (#6546)

---
 io.c                 | 1 +
 test/ruby/test_io.rb | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/io.c b/io.c
index 99513573d7..2fe092b84e 100644
--- a/io.c
+++ b/io.c
@@ -8407,6 +8407,7 @@ rb_io_init_copy(VALUE dest, VALUE io) https://github.com/ruby/ruby/blob/trunk/io.c#L8407
     fptr->encs = orig->encs;
     fptr->pid = orig->pid;
     fptr->lineno = orig->lineno;
+    fptr->timeout = orig->timeout;
     if (!NIL_P(orig->pathv)) fptr->pathv = orig->pathv;
     fptr_copy_finalizer(fptr, orig);
 
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 0c8beb2f95..989c4c8991 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1441,6 +1441,14 @@ class TestIO < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_io.rb#L1441
     End
   end
 
+  def test_dup_timeout
+    with_pipe do |r, w|
+      r.timeout = 0.1
+      r2 = r.dup
+      assert_equal(0.1, r2.timeout)
+    end
+  end
+
   def test_inspect
     with_pipe do |r, w|
       assert_match(/^#<IO:fd \d+>$/, r.inspect)
-- 
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