merges r29205 from trunk into ruby_1_9_2.

--
* vm.c (vm_backtrace_each): skip allocator frames which have no
  name.  [ruby-core:32231]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29665 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index d222a46412..f4034b170d 100644
--- a/vm.c
+++ b/vm.c
@@ -741,7 +741,8 @@ vm_backtrace_each(rb_thread_t *th, int lev, void (*init)(void *), rb_backtrace_i
 		id = cfp->me->def->original_id;
 	    else
 		id = cfp->me->called_id;
-	    if ((*iter)(arg, file, line_no, rb_id2str(id))) break;
+	    if (id != ID_ALLOCATOR && (*iter)(arg, file, line_no, rb_id2str(id)))
+		break;
 	}
 	cfp = RUBY_VM_NEXT_CONTROL_FRAME(cfp);
     }