[win-pv-devel] [PATCH 14/14 v2] Fail FrontendPrepare if backend doesn't reinitialize

[<owen.smith@xxxxxxxxxx>]

From: Owen Smith <owen.smith@xxxxxxxxxx>

Current backend will crash (taking out the VM) if any attempt is
made to reconnect to a backend that has transitioned to the
Closed state. Forces the frontend offline, which will fail the
frontend state transitions, and its initiating IRP.

Signed-off-by: Owen Smith <owen.smith@xxxxxxxxxx>
---
 src/xencons/frontend.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/xencons/frontend.c b/src/xencons/frontend.c
index f7d3b23..9f6e13d 100755
--- a/src/xencons/frontend.c
+++ b/src/xencons/frontend.c
@@ -652,6 +652,12 @@ FrontendPrepare(
         case XenbusStateClosed:
             FrontendSetXenbusState(Frontend,
                                    XenbusStateClosed);
+            // There is currently a bug in the backend.
+            // Once the backend reaches Closed, it will crash the
+            // frontend attempts to make any state transition.
+            // Avoid the bug by forcing the frontend offline and
+            // failing FrontendPrepare
+            FrontendSetOffline(Frontend);
             break;
         default:
             FrontendSetXenbusState(Frontend,
-- 
2.8.3


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