Apply Changes fails on the diego-cell's rep job after upgrading TPCF in conjunction with VMware NSX Container Plugin

Products

• VMware Tanzu Application Service

Issue/Introduction

After updating TPCF with NSX-T to 6.0.18 it fails with

Task 16473639 | 23:27:52 | Error: 'diego_cell/######-####-####-####-######## (0)' is not running after update. Review logs for failed jobs: rep
Task 16473639 Started  Thu Jul 31 19:56:02 UTC 2025
Task 16473639 Finished Thu Jul 31 23:27:52 UTC 2025
Task 16473639 Duration 03:31:50
Task 16473639 error

 

garden.stdout.log shows this error

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x562402]
goroutine 1 [running]:
github.com/containernetworking/cni/libcni.(*CNIConfig).DelNetworkList(0xc000124500, {0x698080, 0x85cfe0}, 0x0, 0xc000126420)
    /var/vcap/data/compile/runc-cni/src/code.cloudfoundry.org/vendor/github.com/containernetworking/cni/libcni/api.go:594 +0x42
code.cloudfoundry.org/garden-external-networker/cni.(*CNIController).Down(0xc0001161e0, {0xc000194000, 0x57}, {0x7ffdf4b8bb5b, 0x2d})
    /var/vcap/data/compile/runc-cni/src/code.cloudfoundry.org/garden-external-networker/cni/cni_controller.go:69 +0xb9
code.cloudfoundry.org/garden-external-networker/manager.(*Manager).Down(0xc00017de08, {0x7ffdf4b8bb5b, 0x2d})
    /var/vcap/data/compile/runc-cni/src/code.cloudfoundry.org/garden-external-networker/manager/manager.go:165 +0xb9
code.cloudfoundry.org/garden-external-networker/ipc.(*Mux).Handle(0x0?, {0x7ffdf4b8bb4d?, 0x6?}, {0x7ffdf4b8bb5b?, 0xc00015c0d0?}, {0x696860?, 0xc000114028?}, {0x696880?, 0xc000114030?})
    /var/vcap/data/compile/runc-cni/src/code.cloudfoundry.org/garden-external-networker/ipc/ipc.go:35 +0x209
main.mainWithError({0x696880, 0xc000114038})
    /var/vcap/data/compile/runc-cni/src/code.cloudfoundry.org/garden-external-networker/main.go:163 +0x769
main.main()
    /var/vcap/data/compile/runc-cni/src/code.cloudfoundry.org/garden-external-networker/main.go:72 +0x25"

 

rep.stdout.log shows rep fails to start due to external networker error

{"timestamp":"2025-08-05T12:28:05.500182129Z","level":"error","source":"rep","message":"rep.failed-to-initialize-executor","data":{"error":"1 error occurred:\n\t* external networker encountered an error running 'down' action: exit status 2\n\n"}}

Environment

TPCF and Isolation segment versions:
- 6.0.18
- 10.0.8
- 10.2.0
- 10.2.1

Resolution

Tanzu is currently working on a release that will fix the issue. Open a ticket with the support team to be assisted with the workaround while the new version is released.