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

The socket and pid files will retain even vm is destroyed for vhostuser passt interface

What is the impact of this issue to you?

The directory will grow with these legacy files

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

libvirt-10.10.0-7.el9.x86_64
qemu-kvm-9.1.0-15.el9.x86_64
passt-0^20250217.ga1e48a0-1.el9.x86_64

How reproducible is this bug?:

100%

Steps to reproduce

1.  prepare a vm with vhostuser passt interface, start and destroy the vm, check the files retained in the directory:

   # ll /run/libvirt/qemu/passt 
   total 0
   
   # virsh dumpxml rhel --xpath //interface 
   <interface type="vhostuser">
     <mac address="52:54:00:5a:2d:da"/>
     <model type="virtio"/>
     <backend type="passt" logFile="/run/user/107/passt.log"/>
     <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
   </interface>
   
   # virsh start rhel 
   Domain 'rhel' started
   
   # ll /run/libvirt/qemu/passt 
   total 4
   -rw-------. 1 qemu qemu 6 Feb 20 02:48 2-rhel-net0-passt.pid
   srwxr-xr-x. 1 qemu qemu 0 Feb 20 02:48 2-rhel-net0.socket
   srwxr-xr-x. 1 qemu qemu 0 Feb 20 02:48 2-rhel-net0.socket.repair
   
   # virsh destroy rhel
   Domain 'rhel' destroyed
   
   # ll /run/libvirt/qemu/passt 
   total 4
   -rw-------. 1 qemu qemu 6 Feb 20 02:48 2-rhel-net0-passt.pid
   srwxr-xr-x. 1 qemu qemu 0 Feb 20 02:48 2-rhel-net0.socket
   srwxr-xr-x. 1 qemu qemu 0 Feb 20 02:48 2-rhel-net0.socket.repair
   

1.   when vm start fail, it will also left legacy files

   # ll /run/libvirt/qemu/passt
   total 0
   # virsh allocpages 2M 0
   # virsh start rhel 
   error: Failed to start domain 'rhel'
   error: internal error: QEMU unexpectedly closed the monitor (vm='rhel'): 2025-02-20T07:49:32.778920Z qemu-kvm: unable to map backing store for guest RAM: Cannot allocate memory
   # ll /run/libvirt/qemu/passt
   total 4
   -rw-------. 1 qemu qemu 6 Feb 20 03:11 2-rhel-net0-passt.pid
   srwxr-xr-x. 1 qemu qemu 0 Feb 20 03:11 2-rhel-net0.socket
   srwxr-xr-x. 1 qemu qemu 0 Feb 20 03:11 2-rhel-net0.socket.repair
   

Expected results

These files should be cleared if unused by any processes

Actual results

The legacy files retain in the directory