Re: [PATCH] NetworkPkg: Fix RSOD issue in Ip6Dxe

["Li, Gary (HPS SW)" <garyli@hpe.com>]

Hi Ting,

This issue can be reproduce by switching POST hotkey quickly and  repeatedly.

Regards,

Gary Li
Platform SW Engineering
Servers
Office: +886 (2) 8722 9977

-----Original Message-----
From: Ye, Ting [mailto:ting.ye@intel.com] 
Sent: Thursday, September 22, 2016 4:48 PM
To: Li, Gary (HPS SW) <garyli@hpe.com>; edk2-devel@lists.01.org
Cc: Fu, Siyuan <siyuan.fu@intel.com>; Wu, Jiaxin <jiaxin.wu@intel.com>
Subject: RE: [edk2] [PATCH] NetworkPkg: Fix RSOD issue in Ip6Dxe

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-bounces@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.ye@intel.com>; Fu, Siyuan <siyuan.fu@intel.com>; Wu, Jiaxin <jiaxin.wu@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 <garyli@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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