[Bug]: [backup]When latest Milvus-Backup backs up 2.6 milvus, proxy panic: runtime error: invalid memory address or nil pointer dereference

[qixuan0212]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: master-20250615-d35c33da-amd64
- Deployment mode(standalone or cluster):clsuter 
- MQ type(rocksmq, pulsar or kafka): both 
- SDK version(e.g. pymilvus v2.0.0rc2): 2.6.0rc139
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

[2025/06/16 17:30:50.529 +08:00] [INFO] [backup/collection.go:695] ["backup segment"] [db_name=default] [collection_name=customized_setup_query_1747220631] [backup_id=964d5b86-4a94-11f0-9a90-0ebcfbebcb99] [segment_id=458762767238150234]
[2025/06/16 17:30:50.530 +08:00] [INFO] [backup/collection.go:695] ["backup segment"] [db_name=default] [collection_name=customized_setup_query_1747220631] [backup_id=964d5b86-4a94-11f0-9a90-0ebcfbebcb99] [segment_id=458762767238179122]
[2025/06/16 17:30:50.530 +08:00] [INFO] [backup/task.go:119] ["backup all collections successfully"] [backup_id=964d5b86-4a94-11f0-9a90-0ebcfbebcb99]
[2025/06/16 17:30:50.530 +08:00] [INFO] [backup/task.go:123] ["skip backup rbac"] [backup_id=964d5b86-4a94-11f0-9a90-0ebcfbebcb99]
[2025/06/16 17:30:50.530 +08:00] [INFO] [backup/task.go:127] ["start backup rpc channel pos"] [backup_id=964d5b86-4a94-11f0-9a90-0ebcfbebcb99]
[2025/06/16 17:30:50.530 +08:00] [INFO] [backup/task.go:393] ["try to get rpc channel pos"] [backup_id=964d5b86-4a94-11f0-9a90-0ebcfbebcb99] [rpc_channel=by-dev-replicate-msg]
[2025/06/16 17:31:13.734 +08:00] [WARN] [grpclog/grpclog.go:155] ["[core][Channel #1 SubChannel #2]grpc: addrConn.createTransport failed to connect to {Addr: "10.104.18.18:19530", ServerName: "10.104.18.18:19530", BalancerAttributes: {"<%!p(pickfirstleaf.managedByPickfirstKeyType={})>": "<%!p(bool=true)>" }}. Err: connection error: desc = "error reading server preface: read tcp 172.16.20.50:49361->10.104.18.18:19530: use of closed network connection""]
[2025/06/16 17:31:16.839 +08:00] [WARN] [grpclog/grpclog.go:155] ["[core][Channel #1 SubChannel #2]grpc: addrConn.createTransport failed to connect to {Addr: "10.104.18.18:19530", ServerName: "10.104.18.18:19530", BalancerAttributes: {"<%!p(pickfirstleaf.managedByPickfirstKeyType={})>": "<%!p(bool=true)>" }}. Err: connection error: desc = "error reading server preface: read tcp 172.16.20.50:49362->10.104.18.18:19530: use of closed network connection""]

Expected Behavior

backup success

Steps To Reproduce

milvus-backup(v0.5.6) do backup for 2.6 milvus(master-20250615-d35c33da-amd64)

Milvus Log

https://grafana-4am.zilliz.cc/explore?orgId=1&panes=%7B%22PRW%22:%7B%22datasource%22:%22vhI6Vw67k%22,%22queries%22:%5B%7B%22refId%22:%22A%22,%22expr%22:%22%7Bcluster%3D%5C%224am%5C%22,namespace%3D%5C%22qa-milvus%5C%22,pod%3D~%5C%22qx2-addfield-qlytv-milvus-proxy-69b44cffbb-5mzsv%5C%22%7D%22,%22datasource%22:%7B%22type%22:%22loki%22,%22uid%22:%22vhI6Vw67k%22%7D,%22editorMode%22:%22code%22,%22queryType%22:%22range%22%7D%5D,%22range%22:%7B%22from%22:%221750066230000%22,%22to%22:%221750066280000%22%7D%7D%7D&schemaVersion=1

Anything else?

No response

[qixuan0212]

/assign @chyezh

[xiaofan-luan]

/assign @SimFG
please help on check it

[SimFG]

@SimFG I just checked this with @chyezh yesterday.

[chyezh]

@xiaofan-luan
We don't support the old-cdc interface at 2.6 right now.
I will fix it by returning unimplemented error at this interface but not panic at proxy.
The support of cdc at 2.6 with streaming service is in-designing.

[stale]

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