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.