2.1.3 配合 nacos3.0 创建一个来源为mcpsse的mcpserver，不生效并且删除时候崩溃 || 2.1.3 Create an mcpserver with mcpsse source with mcpsse, which does not take effect and crashes when deleted. #2296
Description
源头服务是个springai的mcpsse，配置到nacos3上，higress打印日志2025-05-22T01:11:50.761902Z info McpServer get config callback, namespace:nacos-default-mcp, groupName:mcp-server, dataId:chaofan-mcp-server.json，然而并没有创建mcp服务访问不通。
手动删除nacos上的这个来源后，higress崩溃。
2025-05-22T01:11:50.761902Z info McpServer get config callback, namespace:nacos-default-mcp, groupName:mcp-server, dataId:chaofan-mcp-server.json
2025-05-22T01:11:51.591128Z info McpServer unsubscribe mcp server, groupName:mcp-server, dataId:chaofan-mcp-server.json
2025-05-22T01:11:51.591341Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591383Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591399Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591414Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591434Z info ads full push happen, reason:map[config:1]
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x2a83f22]
goroutine 214 [running]:
github.com/alibaba/higress/registry/nacos/mcpserver.(*MultiConfigListener).Stop(...)
github.com/alibaba/higress/registry/nacos/mcpserver/util.go:75
github.com/alibaba/higress/registry/nacos/mcpserver.(*watcher).unsubscribe(0xc000d62308, {0xc000ed4120, 0xa}, {0xc000ed412c, 0x17})
github.com/alibaba/higress/registry/nacos/mcpserver/watcher.go:372 +0x382
github.com/alibaba/higress/registry/nacos/mcpserver.(*watcher).fetchAllMcpConfig(0xc000d62308)
github.com/alibaba/higress/registry/nacos/mcpserver/watcher.go:321 +0x2d4
github.com/alibaba/higress/registry/nacos/mcpserver.(*watcher).Run(0xc000d62308)
github.com/alibaba/higress/registry/nacos/mcpserver/watcher.go:266 +0x1a5
created by github.com/alibaba/higress/registry/reconcile.(*Reconciler).Reconcile in goroutine 62
github.com/alibaba/higress/registry/reconcile/reconcile.go:127 +0xa6b
The source service is a springai mcpsse, configured on Nacos3, higress print log 2025-05-22T01:11:50.761902Z info McpServer get config callback, namespace:nacos-default-mcp, groupName:mcp-server, dataId:chaofan-mcp-server.json, but the mcp service was not created and accessed is not accessible.
Higress crashed after manually deleting this source on nacos.
2025-05-22T01:11:50.761902Z info McpServer get config callback, namespace:nacos-default-mcp, groupName:mcp-server, dataId:chaofan-mcp-server.json
2025-05-22T01:11:51.591128Z info McpServer unsubscribe mcp server, groupName:mcp-server, dataId:chaofan-mcp-server.json
2025-05-22T01:11:51.591341Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591383Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591399Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591414Z info ads full push happen, reason:map[config:1]
2025-05-22T01:11:51.591434Z info ads full push happen, reason:map[config:1]
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x2a83f22]
goroutine 214 [running]:
github.com/alibaba/higress/registry/nacos/mcpserver.(*MultiConfigListener).Stop(...)
github.com/alibaba/higress/registry/nacos/mcpserver/util.go:75
github.com/alibaba/higress/registry/nacos/mcpserver.(*watcher).unsubscribe(0xc000d62308, {0xc000ed4120, 0xa}, {0xc000ed412c, 0x17})
github.com/alibaba/higress/registry/nacos/mcpserver/watcher.go:372 +0x382
github.com/alibaba/higress/registry/nacos/mcpserver.(*watcher).fetchAllMcpConfig(0xc000d62308)
github.com/alibaba/higress/registry/nacos/mcpserver/watcher.go:321 +0x2d4
github.com/alibaba/higress/registry/nacos/mcpserver.(*watcher).Run(0xc000d62308)
github.com/alibaba/higress/registry/nacos/mcpserver/watcher.go:266 +0x1a5
created by github.com/alibaba/higress/registry/reconcile.(*Reconciler).Reconcile in goroutine 62
github.com/alibaba/higress/registry/reconcile/reconcile.go:127 +0xa6b