--- old/src/share/vm/ci/ciEnv.cpp	2013-11-06 18:35:33.000000000 +0400
+++ new/src/share/vm/ci/ciEnv.cpp	2013-11-06 18:35:33.000000000 +0400
@@ -935,7 +935,9 @@
 
     // Prevent SystemDictionary::add_to_hierarchy from running
     // and invalidating our dependencies until we install this method.
+    // No safepoints are allowed. Otherwise, class redefinition can occur in between.
     MutexLocker ml(Compile_lock);
+    No_Safepoint_Verifier nsv;
 
     // Change in Jvmti state may invalidate compilation.
     if (!failing() &&
@@ -1001,16 +1003,6 @@
     // Free codeBlobs
     code_buffer->free_blob();
 
-    // stress test 6243940 by immediately making the method
-    // non-entrant behind the system's back. This has serious
-    // side effects on the code cache and is not meant for
-    // general stress testing
-    if (nm != NULL && StressNonEntrant) {
-      MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
-      NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
-                  SharedRuntime::get_handle_wrong_method_stub());
-    }
-
     if (nm == NULL) {
       // The CodeCache is full.  Print out warning and disable compilation.
       record_failure("code cache is full");