--- old/src/os_cpu/linux_x86/vm/os_linux_x86.cpp	2016-09-23 09:16:01.024492520 -0400
+++ new/src/os_cpu/linux_x86/vm/os_linux_x86.cpp	2016-09-23 09:16:00.440489624 -0400
@@ -191,7 +191,9 @@
     // method returns the Java sender of the current frame.
     *fr = os::fetch_frame_from_ucontext(thread, uc);
     if (!fr->is_first_java_frame()) {
-      assert(fr->safe_for_sender(thread), "Safety check");
+      // get_frame_at_stack_banging_point() is only called when we
+      // have well defined stacks so java_sender() calls do not need
+      // to assert safe_for_sender() first.
       *fr = fr->java_sender();
     }
   } else {
@@ -209,8 +211,10 @@
       intptr_t* sp = os::Linux::ucontext_get_sp(uc);
       *fr = frame(sp + 1, fp, (address)*sp);
       if (!fr->is_java_frame()) {
-        assert(fr->safe_for_sender(thread), "Safety check");
         assert(!fr->is_first_frame(), "Safety check");
+        // get_frame_at_stack_banging_point() is only called when we
+        // have well defined stacks so java_sender() calls do not need
+        // to assert safe_for_sender() first.
         *fr = fr->java_sender();
       }
     }