[BUG] Add new subnet will get "invalid memory address or nil pointer dereference" err

[Longchuanzheng]

Kube-OVN Version

v1.12.22

Kubernetes Version

1.25.1

Operation-system/Kernel Version

4.19

Description

When add new subnet, it will return panic: runtime error: invalid memory address or nil pointer dereference

Steps To Reproduce

update kube-ovn to v1.12.22

Current Behavior

kube-ovn-controller CrashLoopBackOff

Expected Behavior

kube-ovn-controller running

[dosubot]

Hey @Longchuanzheng! 👋 I'm here to help you with any bugs, questions, or contributions. Let's get this sorted out together!

I found some similar issues that might be relevant to your problem:

1. "controller panic runtime error: invalid memory address or nil pointer dereference（在1.12.4版本复现）" - This issue was closed and referenced by a fix for a nil pointer ^[1].
2. "invalid memory address or nil pointer dereference" in vpc_nat.go - This issue was also closed and referenced by a fix for an invalid memory address ^[2].

To resolve the "invalid memory address or nil pointer dereference" error when adding a new subnet in Kube-OVN v1.12.22 on Kubernetes v1.25.1, you should update to Kube-OVN v1.12.20 or later. The changelog for Kube-OVN v1.12.20 includes a fix for a nil pointer issue:

* [b2f7da5f](https://github.com/kubeovn/kube-ovn/commit/b2f7da5fc24bb50ae3358e05c065b35eda9c5e54) fix nil pointer (#3661)

This fix should address the error you are encountering ^[3].

To continue talking to Dosu, mention @dosu.

[bobz965]

校验 以 /32 结尾的非法 ipv4 cidr，同理校验 /128 结尾的非法 ipv6 cidr，目前会导致空指针问题。

init ipam 需要补充log，表明处理哪个子网，