qemu-kvm/kvm-migration-rdma-unregister-fd-handler.patch

From 93cfdba0a95999ba3d44afe5c15cc3810446f11b Mon Sep 17 00:00:00 2001
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Date: Thu, 24 Jan 2019 16:41:10 +0000
Subject: [PATCH 1/3] migration/rdma: unregister fd handler
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-id: <20190124164110.18787-2-dgilbert@redhat.com>
Patchwork-id: 84110
O-Subject: [RHEL-8.0 qemu-kvm PATCH 1/1] migration/rdma: unregister fd handler
Bugzilla: 1666601
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: Pankaj Gupta <pagupta@redhat.com>
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Unregister the fd handler before we destroy the channel,
otherwise we've got a race where we might land in the
fd handler just as we're closing the device.

(The race is quite data dependent, you just have to have
the right set of devices for it to trigger).

Corresponds to RH bz: https://bugzilla.redhat.com/show_bug.cgi?id=1666601

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20190122173111.29821-1-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
(cherry picked from commit fbbaacab2758cb3f32a07524710533b1d6422be4)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 migration/rdma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/migration/rdma.c b/migration/rdma.c
index 9b2e7e1..54a3c11 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -2321,6 +2321,7 @@ static void qemu_rdma_cleanup(RDMAContext *rdma)
         rdma->connected = false;
     }
 
+    qemu_set_fd_handler(rdma->channel->fd, NULL, NULL, NULL);
     g_free(rdma->dest_blocks);
     rdma->dest_blocks = NULL;
 
-- 
1.8.3.1