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

Hotplug a VF to the guest

Please provide the package NVR for which the bug is seen:

libvirt-11.10.0-10.el10.aarch64
qemu-kvm-10.1.0-13.el10.aarch64
6.12.0-211.el10.aarch64+64k

How reproducible is this bug?:

100%

Steps to reproduce

1. Start vm
2. Run virsh command:

   virsh attach-interface --domain avocado-vt-vm1 hostdev --source 0002:01:10.0 --mac 9a:2a:38:b5:79:8c --alias ua-08385d76-db52-4ee0-89db-db899ca3553b --managed
   error: Disconnected from qemu:///system due to end of file
   error: Failed to attach interface
   error: End of file while reading data: Input/output error

   The interface xml is below:

   <interface type='hostdev' managed='yes'>
     <source>
       <address type='pci' domain='0x0002' bus='0x01' slot='0x10' function='0x0'/>
     </source>
     <mac address='9a:2a:38:b5:79:8c'/>
     <alias name='ua-08385d76-db52-4ee0-89db-db899ca3553b'/>
   </interface>

Expected results

Actual results

Additional info

rw-r----. 1 root root 3043715 Feb 25 20:56 core.virtqemud.0.9b3d833f73f4443c9f5637973575a32d.379486.1772071003000000.zst
{}Type <RET> for more, q to quit, c to continue without paging{-}-c
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/sbin/virtqemud --timeout 120'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000fffbfc0e2a90 in qemuDomainAttachHostPCIDevice (driver=0xfffbb4006750, vm=0xfffbf001f790, hostdev=0xfffbf400b150) at ../src/qemu/qemu_hotplug.c:1652
1652 if ((ret = qemuFDPassDirectTransferMonitor(hostdevPriv->vfioDeviceFd, priv->mon)) < 0)
[Current thread is 1 (Thread 0xfffbffa7ed80 (LWP 379489))]

See attachment for gdb trace.

There is no issue in libvirt-11.10.0-9