Controlplane part of `forwarder-vpp` leaks

[NikitaSkrynnik]

Description

forwarder-vpp has two interface leaks:

1. timeout chain element doesn't call Close for expired connections. Therefore, vpp interfaces are not deleted
2. Even if we call Close in forwarder-vpp it doesn't delete vxlan interfaces

Tasks

• Investigate why timeout doesn't call Close - 8h
  • Make timeout chain element close connetions faster - 1h
  • Add logs to timeout chain element - 1h
  • Run tests with the modified timeout - 3h
  • Check collected logs - 3h
• Fix timeout chain element - 24h
• Investigate why forwarder-vpp doesn't close vxlan interfaces - 6h
  • Run scaling tests - 3h
  • Check collected logs - 3h
• Fix vxlan problem - 16h

Total: 54h

[NikitaSkrynnik]

All changes that fix tap interface leaks are in these PRs:

1. Leak fixes sdk#1643
2. Some changes that fix inteface leaks sdk-vpp#835

[denis-tingaikin]

It seems like the problem is still existing and the forwarder is leaking.

The picture shows mem consumption for forwarder vpp.

forwarder-vpp_goroutineprofiles_20240920082027.tar.gz
forwarder-vpp_memprofiles_20240920082112.tar.gz