https://git.ruby-lang.org/ruby.git/commit/?id=9ab43c7a6c

From 9ab43c7a6c0dc3c661ffb621714ee0c62bdd4566 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 18 Aug 2019 04:32:59 +0000
Subject: merge revision(s) f91879a7b548284c93743168acfd11e3d2aeefac: [Backport
 #15992]

	handle_interrupt to defend monitor state [Bug #15992]

	If an exception is raised from another thread for example Timeout
	and this thread is just after `mon_exit`'s `@mon_owner = nil`,
	the exception breaks the state of MonitorMixin. To prevent that situation,
	it need to block interruption in mon_enter and mon_exit.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67742 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/lib/monitor.rb b/lib/monitor.rb
index 999795c..5b6b14e 100644
--- a/lib/monitor.rb
+++ b/lib/monitor.rb
@@ -225,11 +225,13 @@ module MonitorMixin https://github.com/ruby/ruby/blob/trunk/lib/monitor.rb#L225
   # +MonitorMixin+.
   #
   def mon_synchronize
-    mon_enter
+    # Prevent interrupt on handling interrupts; for example timeout errors
+    # it may break locking state.
+    Thread.handle_interrupt(Exception => :never){ mon_enter }
     begin
       yield
     ensure
-      mon_exit
+      Thread.handle_interrupt(Exception => :never){ mon_exit }
     end
   end
   alias synchronize mon_synchronize
diff --git a/version.h b/version.h
index 7ff4100..cf71153 100644
--- a/version.h
+++ b/version.h
@@ -1,10 +1,10 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.6.3"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 92
+#define RUBY_PATCHLEVEL 93
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 8
-#define RUBY_RELEASE_DAY 11
+#define RUBY_RELEASE_DAY 18
 
 #include "ruby/version.h"
 
-- 
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