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From 21027e308bf410293a745d4358a848e9aa037df1 Mon Sep 17 00:00:00 2001
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From: Laurent Vivier <lvivier@redhat.com>
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Date: Mon, 10 May 2021 13:08:20 -0400
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Subject: [PATCH 09/15] virtio-net: failover: add missing
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remove_migration_state_change_notifier()
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RH-Author: Miroslav Rezanina <mrezanin@redhat.com>
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RH-MergeRequest: 5: Synchronize RHEL-AV 8.5 release 18 to RHEL 9 Beta
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RH-Commit: [4/12] 884f0f99fbbba4312663ec6232b1d8c9576df84e (mrezanin/centos-src-qemu-kvm)
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RH-Bugzilla: 1957194
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RH-Acked-by: Danilo Cesar Lemes de Paula <ddepaula@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Greg Kurz <gkurz@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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In the failover case configuration, virtio_net_device_realize() uses an
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add_migration_state_change_notifier() to add a state notifier, but this
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notifier is not removed by the unrealize function when the virtio-net
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card is unplugged.
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If the card is unplugged and a migration is started, the notifier is
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called and as it is not valid anymore QEMU crashes.
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This patch fixes the problem by adding the
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remove_migration_state_change_notifier() in virtio_net_device_unrealize().
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The problem can be reproduced with:
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$ qemu-system-x86_64 -enable-kvm -m 1g -M q35 \
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-device pcie-root-port,slot=4,id=root1 \
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-device pcie-root-port,slot=5,id=root2 \
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-device virtio-net-pci,id=net1,mac=52:54:00:6f:55:cc,failover=on,bus=root1 \
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-monitor stdio disk.qcow2
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(qemu) device_del net1
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(qemu) migrate "exec:gzip -c > STATEFILE.gz"
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Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
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0x0000000000000000 in ?? ()
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(gdb) bt
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#0 0x0000000000000000 in ()
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#1 0x0000555555d726d7 in notifier_list_notify (...)
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at .../util/notify.c:39
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#2 0x0000555555842c1a in migrate_fd_connect (...)
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at .../migration/migration.c:3975
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#3 0x0000555555950f7d in migration_channel_connect (...)
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error@entry=0x0) at .../migration/channel.c:107
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#4 0x0000555555910922 in exec_start_outgoing_migration (...)
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at .../migration/exec.c:42
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Reported-by: Igor Mammedov <imammedo@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit a7eca58380f9589bb1bb6333ccfb58869734edb6)
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/net/virtio-net.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
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index 66b9ff4511..914051feb7 100644
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--- a/hw/net/virtio-net.c
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+++ b/hw/net/virtio-net.c
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@@ -3373,6 +3373,7 @@ static void virtio_net_device_unrealize(DeviceState *dev)
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if (n->failover) {
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device_listener_unregister(&n->primary_listener);
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+ remove_migration_state_change_notifier(&n->migration_state);
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}
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max_queues = n->multiqueue ? n->max_queues : 1;
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--
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2.27.0
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