diff -r 65db40192591 -r ba65669135cb src/mem/cache/cache.hh
--- a/src/mem/cache/cache.hh	Wed Dec 09 22:56:31 2015 -0500
+++ b/src/mem/cache/cache.hh	Wed Dec 09 11:14:42 2015 +0800
@@ -392,7 +392,8 @@
      * @return The snoop delay incurred by the upwards snoop
      */
     uint32_t handleSnoop(PacketPtr pkt, CacheBlk *blk,
-                         bool is_timing, bool is_deferred, bool pending_inval);
+                         bool is_timing, bool is_deferred, bool pending_inval,
+                         MSHR* mshr = nullptr);
 
     /**
      * Create a writeback request for the given block.
diff -r 65db40192591 -r ba65669135cb src/mem/cache/cache.cc
--- a/src/mem/cache/cache.cc	Wed Dec 09 22:56:31 2015 -0500
+++ b/src/mem/cache/cache.cc	Wed Dec 09 11:14:42 2015 +0800
@@ -1439,7 +1439,8 @@
             // response to snoop request
             DPRINTF(Cache, "processing deferred snoop...\n");
             assert(!(is_invalidate && !mshr->hasPostInvalidate()));
-            handleSnoop(tgt_pkt, blk, true, true, mshr->hasPostInvalidate());
+            handleSnoop(tgt_pkt, blk, true, true, mshr->hasPostInvalidate(),
+                        mshr);
             break;
 
           default:
@@ -1867,7 +1868,7 @@
 
 uint32_t
 Cache::handleSnoop(PacketPtr pkt, CacheBlk *blk, bool is_timing,
-                   bool is_deferred, bool pending_inval)
+                   bool is_deferred, bool pending_inval, MSHR *mshr)
 {
     DPRINTF(Cache, "%s for %s addr %#llx size %d\n", __func__,
             pkt->cmdString(), pkt->getAddr(), pkt->getSize());
@@ -2015,7 +2016,12 @@
         // need to delete the request and not rely on the packet
         // destructor
         assert(pkt->needsResponse());
-        delete pkt->req;
+
+        // check if pkt->req is created by mshr before deleting it.
+        if (mshr && mshr->createdRequests.count(pkt->req)) {
+            mshr->createdRequests.erase(pkt->req);
+            delete pkt->req;
+        }
         delete pkt;
     }
 
diff -r 65db40192591 -r ba65669135cb src/mem/cache/mshr.hh
--- a/src/mem/cache/mshr.hh	Wed Dec 09 22:56:31 2015 -0500
+++ b/src/mem/cache/mshr.hh	Wed Dec 09 11:14:42 2015 +0800
@@ -187,6 +187,9 @@
     /** Thread number of the miss. */
     ThreadID threadNum;
 
+    /** Created requests in this MSHR */
+    std::set<Request*> createdRequests;
+
   private:
 
     /** Data buffer (if needed).  Currently used only for pending
diff -r 65db40192591 -r ba65669135cb src/mem/cache/mshr.cc
--- a/src/mem/cache/mshr.cc	Wed Dec 09 22:56:31 2015 -0500
+++ b/src/mem/cache/mshr.cc	Wed Dec 09 11:14:42 2015 +0800
@@ -392,6 +392,10 @@
             // => Create a copy of the request, as that may get deallocated as
             // well
             cp_pkt = new Packet(new Request(*pkt->req), pkt->cmd);
+
+            // store the created request for verification when deleting it.
+            createdRequests.insert(pkt->req);
+
             DPRINTF(Cache, "Copying packet %p -> %p and request %p -> %p\n",
                     pkt, cp_pkt, pkt->req, cp_pkt->req);
         }