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

Fails to change vcpus of guest and guest get shut off. 

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

# rpm -q libvirt qemu-kvm
libvirt-11.10.0-1.el10.x86_64
qemu-kvm-10.1.0-8.el10.x86_64

How reproducible is this bug?:100%

Steps to reproduce

1. Start the guest with below xml:
<vcpu placement="static" current="2">4</vcpu>

2. After the guest os boot up, change the guest vcpus

# virsh setvcpus vm1 4 --live 

# virsh setvcpus vm1 2 --live 

3. Then change the guest vcpus again, found the virsh cmd get error as below:

# virsh setvcpus vm1 3 --live 
error: Unable to read from monitor: Connection reset by peer

4. The guest is shut off:

# virsh list --all
 Id   Name   State
-----------------------
 -    vm1    shut off

Expected results

vcpus could be changed for guest successfully.

Actual results

Failed to change guest vcpus