qemu-kvm crashed when migrating guest with failover vf

What were you trying to do that didn't work?

When live migrating rhel93 or windows guest(e.g. win2022, win2016) with the failover vf, qemu-kvm will crash.

qemu-kvm: ../block/graph-lock.c:257: void bdrv_graph_rdlock_main_loop(void): Assertion `!qemu_in_coroutine()' failed.

qemu-kvm-7.2.0-14.el9_2.x86_64 works well, so it is a regression bug.

And live migration without failover vf will not meet the issue, can succeed.

Package versions

qemu-kvm-8.0.0-1.el9.x86_64

libvirt-9.5.0-2.el9.x86_64

Steps to reproduce

1.create vf on both src host and dst host

echo 1 > /sys/bus/pci/devices/0000\:1a\:00.1/sriov_numvfs

2.create failover-vf and failover-bridge network on both src and dst host

1. virsh net-dumpxml failover-bridge 
   <network connections='1'>
     <name>failover-bridge</name>
     <uuid>1943a508-b0b7-4274-be5a-6f0143d10f40</uuid>
     <forward mode='bridge'/>
     <bridge name='br0'/>
   </network>

1. virsh net-dumpxml failover-vf
   <network connections='1'>
     <name>failover-vf</name>
     <uuid>4319b666-8f4b-410a-886f-17b6df772224</uuid>
     <forward mode='hostdev' managed='yes'>
       <address type='pci' domain='0x0000' bus='0x1a' slot='0x08' function='0x2'/>
     </forward>
   </network>

3.boot rhel93/win2022 guest with failover vf on src host
    <interface type='network'>
      <mac address='52:54:00:aa:1c:ef'/>
      <source network='failover-bridge'/>
      <model type='virtio'/>
      <teaming type='persistent'/>
      <alias name='ua-test'/>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
    </interface>
    <interface type='network'>
      <mac address='52:54:00:aa:1c:ef'/>
      <source network='failover-vf'/>
      <teaming type='transient' persistent='ua-test'/>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
    </interface>

4. live migrating the guest

Expected results

Guest can be migrated successfully.

Actual results

qemu-kvm crashed with following info.

qemu-kvm: ../block/graph-lock.c:257: void bdrv_graph_rdlock_main_loop(void): Assertion `!qemu_in_coroutine()' failed.