dbl-x opened a new issue #527:
URL: https://github.com/apache/rocketmq-client-go/issues/527
**BUG REPORT**
**Please add the branch name [Native]/[Master] at the header of the Isssue
title.**
1. Please describe the issue you observed:
- When concurrent UpdateNameServerAddress and getNameServerAddress,
because namesrvs.srvs has changed, and namesrvs.index is not adjusted
accordingly, the execution of "s.srvs[s.index]" causes the array to out of range
2. Please tell us about your environment:
- rocketmq-client-go: v2.1.0-rc4 and master
3. Other information (e.g. detailed explanation, logs, related issues,
suggestions on how to fix, etc):
```
panic: runtime error: index out of range [5] with length 5
goroutine 257 [running]:
github.com/apache/rocketmq-client-go/v2/internal.(*namesrvs).getNameServerAddress(0xc000c92240,
0x0, 0x0)
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/namesrv.go:123
+0x16d
github.com/apache/rocketmq-client-go/v2/internal.(*namesrvs).queryTopicRouteInfoFromServer(0xc000c92240,
0xc000eb9580, 0x31, 0x479ad0, 0xc00194ebe0, 0xc000760340)
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/route.go:355
+0x274
github.com/apache/rocketmq-client-go/v2/internal.(*namesrvs).UpdateTopicRouteInfoWithDefault(0xc000c92240,
0xc000eb9580, 0x31, 0x0, 0x0, 0x0, 0x0, 0xc000a7f200, 0x0, 0x0)
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/route.go:132
+0xcf
github.com/apache/rocketmq-client-go/v2/internal.(*namesrvs).UpdateTopicRouteInfo(...)
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/route.go:116
github.com/apache/rocketmq-client-go/v2/internal.(*rmqClient).UpdateTopicRouteInfo(0xc0007fe340)
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/client.go:527
+0x17d
github.com/apache/rocketmq-client-go/v2/internal.(*rmqClient).Start.func1.2.1(...)
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/client.go:292
github.com/apache/rocketmq-client-go/v2/internal.(*rmqClient).Start.func1.2()
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/client.go:302
+0x156
github.com/apache/rocketmq-client-go/v2/primitive.WithRecover(0xc000760430)
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/primitive/base.go:96
+0x49
created by
github.com/apache/rocketmq-client-go/v2/internal.(*rmqClient).Start.func1
/go/pkg/mod/github.com/apache/rocketmq-client-go/[email protected]/internal/client.go:289
+0x10e
```
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