Can't cdebug coredns pod

[max-allan-cgr]

When I try to debug a coredns pod, I get a weird error.

cdebug --version
cdebug version 0.0.18 (built: 2024-04-13T13:57:11Z commit: Homebrew)

kubectl describe pod -n kube-system coredns-7db6d8ff4d-ll6lj
Name:                 coredns-7db6d8ff4d-ll6lj
Namespace:            kube-system
Priority:             2000000000
Priority Class Name:  system-cluster-critical
Service Account:      coredns
Node:                 docker-desktop/192.168.65.3
Start Time:           Mon, 04 Nov 2024 17:17:13 +0000
Labels:               k8s-app=kube-dns
                      pod-template-hash=7db6d8ff4d
Annotations:          <none>
Status:               Running
IP:                   10.1.22.196
IPs:
  IP:           10.1.22.196
Controlled By:  ReplicaSet/coredns-7db6d8ff4d
Containers:
  coredns:
    Container ID:  docker://64a62a6a729f438ea8b666ae50b17f7cfec16f4bc50065893cf8eaf5699eaaca
    Image:         registry.k8s.io/coredns/coredns:v1.11.1
    Image ID:      docker://sha256:2437cf762177702dec2dfe99a09c37427a15af6d9a57c456b65352667c223d93
    Ports:         53/UDP, 53/TCP, 9153/TCP
    Host Ports:    0/UDP, 0/TCP, 0/TCP
    Args:
      -conf
      /etc/coredns/Corefile
    State:          Running
      Started:      Mon, 04 Nov 2024 17:17:14 +0000
    Ready:          True
    Restart Count:  0
    Limits:
      memory:  170Mi
    Requests:
      cpu:        100m
      memory:     70Mi
    Liveness:     http-get http://:8080/health delay=60s timeout=5s period=10s #success=1 #failure=5
    Readiness:    http-get http://:8181/ready delay=0s timeout=1s period=10s #success=1 #failure=3
    Environment:  <none>
    Mounts:
      /etc/coredns from config-volume (ro)
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-sx6bm (ro)
Conditions:
  Type                        Status
  PodReadyToStartContainers   True 
  Initialized                 True 
  Ready                       True 
  ContainersReady             True 
  PodScheduled                True 
Volumes:
  config-volume:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      coredns
    Optional:  false
  kube-api-access-sx6bm:
    Type:                    Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds:  3607
    ConfigMapName:           kube-root-ca.crt
    ConfigMapOptional:       <nil>
    DownwardAPI:             true
QoS Class:                   Burstable
Node-Selectors:              kubernetes.io/os=linux
Tolerations:                 CriticalAddonsOnly op=Exists
                             node-role.kubernetes.io/control-plane:NoSchedule
                             node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  15s   default-scheduler  Successfully assigned kube-system/coredns-7db6d8ff4d-ll6lj to docker-desktop
  Normal  Pulled     14s   kubelet            Container image "registry.k8s.io/coredns/coredns:v1.11.1" already present on machine
  Normal  Created    14s   kubelet            Created container coredns
  Normal  Started    14s   kubelet            Started container coredns
[max.allan@Maxs-MacBook-Pro ~]$ cdebug exec -it -n kube-system pod/coredns-7db6d8ff4d-ll6lj/coredns
Debugger container name: cdebug-2378692e
Starting debugger container...
Waiting for debugger container...
sh: can't open no: no such file
cdebug: Debugger container "cdebug-2378692e" terminated: Error -  (exit code: 1).

Looking at the describe again, I see a new ephemeral container:

Ephemeral Containers:
  cdebug-2378692e:
    Container ID:  docker://5cf09fc29a82191d25ae394e4ced9c1042aca82004b01e609cb5bf31b6d64f4f
    Image:         docker.io/library/busybox:musl
    Image ID:      docker-pullable://busybox@sha256:e95352f7c5174c96ffc684150c9d08fc3ba26ac2f37c613c398fd369e15a0789
    Port:          <none>
    Host Port:     <none>
    Command:
      sh
      -c
      
      set -eu
      
      export CDEBUG_ROOTFS=/
      
      if [ "${HOME:-/}" != "/" ]; then
        ln -s /proc/<no value>/root/ ${HOME}target-rootfs
      fi
      
      # TODO: Add target container's PATH to the user's PATH
      
      exec sh
      
    State:          Terminated
      Reason:       Error
      Exit Code:    1

Looks like something isn't replacing a <no value> template with a real value.

Any ideas?