--- a/hotspot/src/os/windows/vm/os_windows.cpp	Mon Sep 26 14:38:35 2016 -0400
+++ b/hotspot/src/os/windows/vm/os_windows.cpp	Mon Sep 26 20:24:34 2016 +0000
@@ -2366,7 +2366,9 @@
   if (Interpreter::contains(pc)) {
     *fr = os::fetch_frame_from_context((void*)exceptionInfo->ContextRecord);
     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 {
@@ -2383,7 +2385,7 @@
       // has been pushed on the stack
       *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
       if (!fr->is_java_frame()) {
-        assert(fr->safe_for_sender(thread), "Safety check");
+        // See java_sender() comment above.
         *fr = fr->java_sender();
       }
     }

--- a/hotspot/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp	Mon Sep 26 14:38:35 2016 -0400
+++ b/hotspot/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp	Mon Sep 26 20:24:34 2016 +0000
@@ -378,7 +378,9 @@
     // 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 {
@@ -395,7 +397,7 @@
       // has been pushed on the stack
       *fr = frame(fr->sp() + 1, fr->fp(), (address)*(fr->sp()));
       if (!fr->is_java_frame()) {
-        assert(fr->safe_for_sender(thread), "Safety check");
+        // See java_sender() comment above.
         *fr = fr->java_sender();
       }
     }

--- a/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp	Mon Sep 26 14:38:35 2016 -0400
+++ b/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp	Mon Sep 26 20:24:34 2016 +0000
@@ -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 +211,8 @@
       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");
+        // See java_sender() comment above.
         *fr = fr->java_sender();
       }
     }

--- a/hotspot/src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp	Mon Sep 26 14:38:35 2016 -0400
+++ b/hotspot/src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp	Mon Sep 26 20:24:34 2016 +0000
@@ -255,7 +255,9 @@
     // 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 {
@@ -273,7 +275,7 @@
       intptr_t* sp = os::Solaris::ucontext_get_sp(uc);
       *fr = frame(sp + 1, fp, (address)*sp);
       if (!fr->is_java_frame()) {
-        assert(fr->safe_for_sender(thread), "Safety check");
+        // See java_sender() comment above.
         *fr = fr->java_sender();
       }
     }