vm_trace.c: isolate exceptions

* vm_trace.c (rb_postponed_job_flush): isolate exceptions in
  postponed jobs and restore outer ones.  based on a patch by
  tarui.  [ruby-core:58652] [Bug #9168]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44260 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Tue Dec 17 16:19:09 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* vm_trace.c (rb_postponed_job_flush): isolate exceptions in
+	  postponed jobs and restore outer ones.  based on a patch by
+	  tarui.  [ruby-core:58652] [Bug #9168]
+
 Tue Dec 17 10:48:04 2013  Aman Gupta <ruby@tmm1.net>
 
 	* configure.in (RUBY_DTRACE_POSTPROCESS): Fix compatibility with

test/ruby/test_gc.rb

@@ -279,6 +279,19 @@ class TestGc < Test::Unit::TestCase
     end
   end
 
+  def test_exception_in_finalizer
+    bug9168 = '[ruby-core:58652] [Bug #9168]'
+    assert_normal_exit(<<-'end;', bug9168)
+      raise_proc = proc {raise}
+      10000.times do
+        ObjectSpace.define_finalizer(Object.new, raise_proc)
+        Thread.handle_interrupt(RuntimeError => :immediate) {break}
+        Thread.handle_interrupt(RuntimeError => :on_blocking) {break}
+        Thread.handle_interrupt(RuntimeError => :never) {break}
+      end
+    end;
+  end
+
   def test_verify_internal_consistency
     assert_nil(GC.verify_internal_consistency)
   end

vm_trace.c

@@ -1511,7 +1511,9 @@ rb_postponed_job_flush(rb_vm_t *vm)
 {
     rb_thread_t *th = GET_THREAD();
     unsigned long saved_postponed_job_interrupt_mask = th->interrupt_mask & POSTPONED_JOB_INTERRUPT_MASK;
+    VALUE saved_errno = th->errinfo;
 
+    th->errinfo = Qnil;
     /* mask POSTPONED_JOB dispatch */
     th->interrupt_mask |= POSTPONED_JOB_INTERRUPT_MASK;
     {
@@ -1530,4 +1532,5 @@ rb_postponed_job_flush(rb_vm_t *vm)
     }
     /* restore POSTPONED_JOB mask */
     th->interrupt_mask &= ~(saved_postponed_job_interrupt_mask ^ POSTPONED_JOB_INTERRUPT_MASK);
+    th->errinfo = saved_errno;
 }