why (*InterfaceVppHandler).DumpInterfaces fail?

[ChenYahui2019]

I developed a new plugin that calls (*InterfaceVppHandler).DumpInterfaces per second.

After a while, the errors started. The error message is: dumping memif socket details failed: all channel IDs are in use

VPP version: v22.10 vpp-agent version: v3.5.0

# vppctl show memif
sockets
  id  listener    filename
  0   no          /run/vpp/memif.sock

# ls /run/vpp/
api.sock  cli.sock  snort.sock  stats.sock