Why might the bridge for kvm not work?

Question

linux

Hello! I ran into such a problem - after it is not clear what actions the bridge (on centos 7), which was used by virtual machines on kvm, stopped working.
There are 2 adapters on the server:
eno1 - main adapter
eno2 - adapter for kvm
Created br0 working through eno2.
There is also docker on the server. The general picture of the bridges is as follows:

brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.98f2b3f4fa5f       no              eno2
                                                        vnet0
docker0         8000.0242912e48f3       no                             veth2b970f3
docker_gwbridge         8000.0242079e682d       no              veth3c8d758
                                                        veth4f968bf
                                                        veth88d4602
                                                        vethd3df5f3
virbr0          8000.525400df5dcf       yes             virbr0-nic

The virtualka connected to br0 does not receive the address on dhcp.

<interface type='bridge'>
      <mac address='52:54:00:9e:a2:03'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>

What should be checked?