使用--agentless --port-forward 参数无法运行

kubectl debug -n ns podname --agentless --port-forward
运行失败

Agent Pod info: [Name:debug-agent-pod-a0df1c92-d63c-11ea-a38e-fa163e0860d3, Namespace:default, Image:aylei/debug-agent:latest, HostPort:10027, ContainerPort:10027]
Waiting for pod debug-agent-pod-a0df1c92-d63c-11ea-a38e-fa163e0860d3 to run...
Error occurred while waiting for pod to run: pod ran to completion
error: pod ran to completion

查询pod状态：
Status: Failed
Reason: PodFitsHostPorts
Message: Pod Predicate PodFitsHostPorts failed

已关闭istio-injection，还是一样报错

Start by reproducing `kubectl debug -n ns podname --agentless --port-forward` and inspect the reported agent pod status, especially the `PodFitsHostPorts` reason. Done means identifying and addressing the cause of the agent pod failure so this command runs successfully; no source file or test is named in the issue.

Written by the indexing model from the issue text.