https://git.ruby-lang.org/ruby.git/commit/?id=43449fb995

From 43449fb9956d568800ed62b326e478b027efe579 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 4 Apr 2021 22:24:29 +0000
Subject: merge revision(s) 579645d9: [Backport #17033]

Fixed infinite loop at error in printing cause [Bug #17033]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 eval_error.c                |  6 +++++-
 test/ruby/test_exception.rb | 20 ++++++++++++++++++++
 version.h                   |  8 ++++----
 3 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/eval_error.c b/eval_error.c
index 8ea58a4..c2d33ef 100644
--- a/eval_error.c
+++ b/eval_error.c
@@ -308,6 +308,7 @@ rb_ec_error_print(rb_execution_context_t * volatile ec, volatile VALUE errinfo) https://github.com/ruby/ruby/blob/trunk/eval_error.c#L308
     volatile uint8_t raised_flag = ec->raised_flag;
     volatile VALUE errat = Qundef;
     volatile VALUE emesg = Qundef;
+    volatile bool written = false;
 
     if (NIL_P(errinfo))
 	return;
@@ -322,7 +323,10 @@ rb_ec_error_print(rb_execution_context_t * volatile ec, volatile VALUE errinfo) https://github.com/ruby/ruby/blob/trunk/eval_error.c#L323
 	emesg = rb_get_message(errinfo);
     }
 
-    rb_error_write(errinfo, emesg, errat, Qnil, Qnil, Qnil);
+    if (!written) {
+        written = true;
+        rb_error_write(errinfo, emesg, errat, Qnil, Qnil, Qfalse);
+    }
 
     EC_POP_TAG();
     ec->errinfo = errinfo;
diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index 05c74f6..de249c9 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -842,6 +842,26 @@ end.join https://github.com/ruby/ruby/blob/trunk/test/ruby/test_exception.rb#L842
     }
   end
 
+  def test_cause_exception_in_cause_message
+    assert_in_out_err([], "#{<<~"begin;"}\n#{<<~'end;'}") do |outs, errs, status|
+      begin;
+        exc = Class.new(StandardError) do
+          def initialize(obj, cnt)
+            super(obj)
+            @errcnt = cnt
+          end
+          def to_s
+            return super if @errcnt <= 0
+            @errcnt -= 1
+            raise "xxx"
+          end
+        end.new("ok", 10)
+        raise "[Bug #17033]", cause: exc
+      end;
+      assert_equal(1, errs.count {|m| m.include?("[Bug #17033]")}, proc {errs.pretty_inspect})
+    end
+  end
+
   def test_anonymous_message
     assert_in_out_err([], "raise Class.new(RuntimeError), 'foo'", [], /foo\n/)
   end
diff --git a/version.h b/version.h
index 4dd1205..82522cd 100644
--- a/version.h
+++ b/version.h
@@ -1,10 +1,10 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.6.7"
-#define RUBY_RELEASE_DATE "2021-03-02"
-#define RUBY_PATCHLEVEL 172
+#define RUBY_RELEASE_DATE "2021-04-05"
+#define RUBY_PATCHLEVEL 173
 
 #define RUBY_RELEASE_YEAR 2021
-#define RUBY_RELEASE_MONTH 3
-#define RUBY_RELEASE_DAY 2
+#define RUBY_RELEASE_MONTH 4
+#define RUBY_RELEASE_DAY 5
 
 #include "ruby/version.h"
 
-- 
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