nobu	2017-03-14 14:54:35 +0900 (Tue, 14 Mar 2017)

  New Revision: 57969

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57969

  Log:
    thread.c: Thread.start with Symbol
    
    * thread.c (thread_do_start): fix segfault at start with Symbol.
      proc created by Symbol#to_proc does not have environment unless
      using refinements.  [ruby-core:80147] [Bug #13313]

  Modified files:
    trunk/test/ruby/test_thread.rb
    trunk/thread.c
Index: test/ruby/test_thread.rb
===================================================================
--- test/ruby/test_thread.rb	(revision 57968)
+++ test/ruby/test_thread.rb	(revision 57969)
@@ -176,6 +176,14 @@ class TestThread < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_thread.rb#L176
     t2.kill if t2
   end
 
+  def test_new_symbol_proc
+    bug = '[ruby-core:80147] [Bug #13313]'
+    assert_ruby_status([], "#{<<-"begin;"}\n#{<<-'end;'}", bug)
+    begin;
+      exit("1" == Thread.start(1, &:to_s).value)
+    end;
+  end
+
   def test_join
     t = Thread.new { sleep }
     assert_nil(t.join(0.05))
Index: thread.c
===================================================================
--- thread.c	(revision 57968)
+++ thread.c	(revision 57969)
@@ -555,10 +555,11 @@ thread_do_start(rb_thread_t *th, VALUE a https://github.com/ruby/ruby/blob/trunk/thread.c#L555
 {
     native_set_thread_name(th);
     if (!th->first_func) {
+	const VALUE *ep = vm_proc_ep(th->first_proc);
 	rb_proc_t *proc;
 	GetProcPtr(th->first_proc, proc);
 	th->errinfo = Qnil;
-	th->root_lep = rb_vm_ep_local_ep(vm_proc_ep(th->first_proc));
+	th->root_lep = ep ? rb_vm_ep_local_ep(ep) : NULL;
 	th->root_svar = Qfalse;
 	EXEC_EVENT_HOOK(th, RUBY_EVENT_THREAD_BEGIN, th->self, 0, 0, 0, Qundef);
 	th->value = rb_vm_invoke_proc(th, proc,

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