Bug 2167657

Description of problem:
Migration hang  when trying to cancel multifd migration sometimes, it's more easily to reproduce at the final stage of migration.

Version-Release number of selected component (if applicable):
libvirt-daemon-9.0.0-3.el9.x86_64
qemu-kvm-7.2.0-7.el9.x86_64

How reproducible:
10%

Steps to Reproduce:
1.Do multifd migraiton:
# virsh migrate test2 qemu+ssh://*.*.com/system --live --verbose --persistent  --parallel --parallel-connections 255

2.Cancel the migration with 'ctrl+c' when the migration almost complete（migration hand not only but easily happened during the final stage),  migration hang sometimes:
# # virsh migrate test2 qemu+ssh://*.*.com/system --live  --verbose --persistent  --parallel --parallel-connections 255  
Migration: [ 99 %]^C
Migration: [ 99 %]
Migration: [ 99 %]

3.Check domjobinfo on the source host:
# virsh domjobinfo test2 
Job type:         Unbounded   
Operation:        Outgoing migration
Time elapsed:     202769       ms
Data processed:   528.429 MiB
Data remaining:   256.953 MiB
Data total:       2.013 GiB
Memory processed: 528.429 MiB
Memory remaining: 256.953 MiB
Memory total:     2.013 GiB
Memory bandwidth: 50.588 MiB/s
Dirty rate:       0            pages/s
Page size:        4096         bytes
Iteration:        1           
Postcopy requests: 0           
Constant pages:   327905      
Normal pages:     133919      
Normal data:      523.121 MiB
Expected downtime: 300          ms
Setup time:       158          ms

4.Check the connection between source and target host:
# netstat -tuxnap|grep qemu-kvm|grep -E "4915|unix" 
unix  2      [ ACC ]     STREAM     LISTENING     115323316 3154235/qemu-kvm     /var/lib/libvirt/qemu/domain-20-test2/monitor.sock
unix  2      [ ACC ]     STREAM     LISTENING     115323315 3154235/qemu-kvm     /var/lib/libvirt/qemu/channel/target/domain-20-test2/org.qemu.guest_agent.0
unix  3      [ ]         STREAM     CONNECTED     115284933 3154235/qemu-kvm     
unix  3      [ ]         STREAM     CONNECTED     115045317 3154235/qemu-kvm     /var/lib/libvirt/qemu/domain-20-test2/monitor.sock
unix  3      [ ]         STREAM     CONNECTED     115284869 3154235/qemu-kvm     
unix  3      [ ]         STREAM     CONNECTED     115284942 3154235/qemu-kvm     /var/lib/libvirt/qemu/channel/target/domain-20-test2/org.qemu.guest_agent.0

5.Check the guest on the target host:
#virsh list
(no output)

Actual results:
Migration hang when trying to cancel multifd migration sometimes, migration may hang during different phase(in the middle of the migration or the final stage of migraiton)

Expected results:
Migration cancelled successfully.

Additional info: