diff --git a/ChangeLog b/ChangeLog
index 8689aa7aa9..253c4f6e2a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Sep  1 12:56:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* thread.c (ruby_suppress_tracing): restore the state and invoke
+	  the func with normal state.  a patch from Satoshi Shiba <shiba
+	  AT rvm.jp> at [ruby-dev:42162].  [ruby-core:31783]
+
 Tue Aug 31 17:32:34 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
 
 	* ext/tk/stubs.c: fix [Bug #3771] "VC++ can't make ext/tk with enabling
diff --git a/test/ruby/test_trace.rb b/test/ruby/test_trace.rb
index 45bc599314..775c458fb1 100644
--- a/test/ruby/test_trace.rb
+++ b/test/ruby/test_trace.rb
@@ -46,4 +46,16 @@ class TestTrace < Test::Unit::TestCase
   ensure
     untrace_var :$x
   end
+
+  def test_trace_break
+    bug2722 = '[ruby-core:31783]'
+    a = Object.new.extend(Enumerable)
+    def a.each
+      yield
+    end
+    assert(Thread.start {
+             Thread.current.add_trace_func(proc{})
+             a.any? {true}
+           }.value, bug2722)
+  end
 end
diff --git a/thread.c b/thread.c
index aa6ecede07..4022f60bca 100644
--- a/thread.c
+++ b/thread.c
@@ -4090,6 +4090,7 @@ ruby_suppress_tracing(VALUE (*func)(VALUE, int), VALUE arg, int always)
     rb_thread_t *th = GET_THREAD();
     int state, tracing;
     volatile int raised;
+    volatile int outer_state;
     VALUE result = Qnil;
 
     if ((tracing = th->tracing) != 0 && !always) {
@@ -4100,6 +4101,8 @@ ruby_suppress_tracing(VALUE (*func)(VALUE, int), VALUE arg, int always)
     }
 
     raised = rb_threadptr_reset_raised(th);
+    outer_state = th->state;
+    th->state = 0;
 
     PUSH_TAG();
     if ((state = EXEC_TAG()) == 0) {
@@ -4115,6 +4118,7 @@ ruby_suppress_tracing(VALUE (*func)(VALUE, int), VALUE arg, int always)
     if (state) {
 	JUMP_TAG(state);
     }
+    th->state = outer_state;
 
     return result;
 }
diff --git a/version.h b/version.h
index ee4d69c8ba..67603b1412 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.2"
-#define RUBY_PATCHLEVEL 27
+#define RUBY_PATCHLEVEL 28
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 9
 #define RUBY_VERSION_TEENY 1