Hi Gary,

Do you mind sharing more details about how to reproduce this issue? We are not 
clear why this would happen. 
It seems the code should continue executing the previous 
Ip6NdFasterTimerTicking function rather than dispatching the new timer event.

Thanks,
Ye Ting

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of Gary Li
Sent: Thursday, September 22, 2016 2:38 PM
To: edk2-devel@lists.01.org
Cc: Ye, Ting <ting...@intel.com>; Fu, Siyuan <siyuan...@intel.com>; Wu, Jiaxin 
<jiaxin...@intel.com>
Subject: [edk2] [PATCH] NetworkPkg: Fix RSOD issue in Ip6Dxe

Avoid the Ip6NdFasterTimerTicking is executed again before the previous 
Ip6NdFasterTimerTicking is done.
When user presses hotkey between the below line, it makes the 
Ip6NdFasterTimerTicking is dispatched again before the previous 
Ip6NdFasterTimerTicking is done.
Therefore, the DelayNode node will be removed twice.

DelayNode = NET_LIST_USER_STRUCT (Entry2, IP6_DELAY_JOIN_LIST, Link); ...
RemoveEntryList (&DelayNode->Link);

Contributed-under: TianoCore Contribution Agreement 1.0

Signed-off-by: Gary Li <gar...@hpe.com>
---
 NetworkPkg/Ip6Dxe/Ip6Nd.c | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/NetworkPkg/Ip6Dxe/Ip6Nd.c b/NetworkPkg/Ip6Dxe/Ip6Nd.c index 
a3f49bb..d400d7c 100644
--- a/NetworkPkg/Ip6Dxe/Ip6Nd.c
+++ b/NetworkPkg/Ip6Dxe/Ip6Nd.c
@@ -2,6 +2,7 @@
   Implementation of Neighbor Discovery support routines.
 
   Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+  (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD 
License @@ -16,6 +17,7 @@  #include "Ip6Impl.h"
 
 EFI_MAC_ADDRESS mZeroMacAddress;
+BOOLEAN mIsInIp6NdFasterTimerTicking = FALSE;
 
 /**
   Update the ReachableTime in IP6 service binding instance data, in 
milliseconds.
@@ -2774,6 +2776,12 @@ Ip6NdFasterTimerTicking (
   IP6_SERVICE               *IpSb;
   BOOLEAN                   Flag;
 
+  if (!mIsInIp6NdFasterTimerTicking) {
+    mIsInIp6NdFasterTimerTicking = TRUE;  } else {
+    return;
+  }
+
   IpSb = (IP6_SERVICE *) Context;
   NET_CHECK_SIGNATURE (IpSb, IP6_SERVICE_SIGNATURE);
 
@@ -2848,7 +2856,7 @@ Ip6NdFasterTimerTicking (
                      NULL
                      );
           if (EFI_ERROR (Status)) {
-            return;
+            goto Exit;
           }
 
           DupAddrDetect->Transmit++;
@@ -2896,7 +2904,7 @@ Ip6NdFasterTimerTicking (
           Ip6CreateSNMulticastAddr (&NeighborCache->Neighbor, &Destination);
           Status = Ip6SelectSourceAddress (IpSb, &NeighborCache->Neighbor, 
&Source);
           if (EFI_ERROR (Status)) {
-            return;
+            goto Exit;
           }
 
           Status = Ip6SendNeighborSolicit ( @@ -2907,7 +2915,7 @@ 
Ip6NdFasterTimerTicking (
                      &IpSb->SnpMode.CurrentAddress
                      );
           if (EFI_ERROR (Status)) {
-            return;
+            goto Exit;
           }
         }
 
@@ -2934,7 +2942,7 @@ Ip6NdFasterTimerTicking (
                    NULL
                    );
         if (EFI_ERROR (Status)) {
-          return;
+          goto Exit;
         }
       }
 
@@ -2965,7 +2973,7 @@ Ip6NdFasterTimerTicking (
                      NULL
                      );
           if (EFI_ERROR (Status)) {
-            return;
+            goto Exit;
           }
         } else {
           NeighborCache->State = EfiNeighborStale; @@ -2986,7 +2994,7 @@ 
Ip6NdFasterTimerTicking (
         //
         Status = Ip6SelectSourceAddress (IpSb, &NeighborCache->Neighbor, 
&Source);
         if (EFI_ERROR (Status)) {
-          return;
+          goto Exit;
         }
 
         Status = Ip6SendNeighborSolicit ( @@ -2997,7 +3005,7 @@ 
Ip6NdFasterTimerTicking (
                    &IpSb->SnpMode.CurrentAddress
                    );
         if (EFI_ERROR (Status)) {
-          return;
+          goto Exit;
         }
 
         NeighborCache->Transmit--;
@@ -3023,7 +3031,7 @@ Ip6NdFasterTimerTicking (
           //
           Status = Ip6SelectSourceAddress (IpSb, &NeighborCache->Neighbor, 
&Source);
           if (EFI_ERROR (Status)) {
-            return;
+            goto Exit;
           }
 
           Status = Ip6SendNeighborSolicit ( @@ -3034,7 +3042,7 @@ 
Ip6NdFasterTimerTicking (
                      &IpSb->SnpMode.CurrentAddress
                      );
           if (EFI_ERROR (Status)) {
-            return;
+            goto Exit;
           }
         }
 
@@ -3061,7 +3069,7 @@ Ip6NdFasterTimerTicking (
                    NULL
                    );
         if (EFI_ERROR (Status)) {
-          return;
+          goto Exit;
         }
       }
 
@@ -3071,6 +3079,9 @@ Ip6NdFasterTimerTicking (
       break;
     }
   }
+
+Exit:
+  mIsInIp6NdFasterTimerTicking = FALSE;
 }
 
 /**
--
2.7.2.windows.1

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