whitekeyboard opened a new issue #1101:
URL: https://github.com/apache/dubbo-go/issues/1101
```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x1c pc=0xacbee0]
goroutine 933 [running]:
github.com/apache/dubbo-go/remoting/getty.(*gettyRPCClientPool).get(0x0,
0x0, 0x0, 0x0)
src/github.com/apache/dubbo-go/remoting/getty/pool.go:380 +0xa0
github.com/apache/dubbo-go/remoting/getty.(*gettyRPCClientPool).getGettyRpcClient(0x0,
0xc000036900, 0x13, 0xc0001a65b0, 0x0, 0x0)
src/github.com/apache/dubbo-go/remoting/getty/pool.go:365 +0x38
github.com/apache/dubbo-go/remoting/getty.(*Client).selectSession(0xc0004df1e0,
0xc000036900, 0x13, 0xc0001a65b0, 0x11aff18, 0xc00041d110, 0x0, 0x0)
src/github.com/apache/dubbo-go/remoting/getty/getty_client.go:212
+0x4a
github.com/apache/dubbo-go/remoting/getty.(*Client).IsAvailable(0xc0004df1e0,
0xc00062ede0)
src/github.com/apache/dubbo-go/remoting/getty/getty_client.go:205
+0x3c
github.com/apache/dubbo-go/remoting.(*ExchangeClient).IsAvailable(...)
src/github.com/apache/dubbo-go/remoting/exchange_client.go:175
github.com/apache/dubbo-go/protocol/dubbo.(*DubboInvoker).IsAvailable(0xc00040e140,
0xc0002375a0)
src/github.com/apache/dubbo-go/protocol/dubbo/dubbo_invoker.go:168
+0x38
github.com/apache/dubbo-go/protocol/protocolwrapper.(*FilterInvoker).IsAvailable(0xc0003d53b0,
0xc00062ede0)
src/github.com/apache/dubbo-go/protocol/protocolwrapper/protocol_filter_wrapper.go:115
+0x34
github.com/apache/dubbo-go/cluster/cluster_impl.(*baseClusterInvoker).doSelectInvoker(0xc00040e800,
0x11834a0, 0x18708d0, 0x11a5ac0, 0xc00038e370, 0xc000043980, 0x2, 0x2,
0xc0002375a0, 0x1, ...)
src/github.com/apache/dubbo-go/cluster/cluster_impl/base_cluster_invoker.go:140
+0x193
github.com/apache/dubbo-go/cluster/cluster_impl.(*baseClusterInvoker).doSelect(0xc00040e800,
0x11834a0, 0x18708d0, 0x11a5ac0, 0xc00038e370, 0xc000043980, 0x2, 0x2,
0xc0002375a0, 0x1, ...)
src/github.com/apache/dubbo-go/cluster/cluster_impl/base_cluster_invoker.go:115
+0x239
github.com/apache/dubbo-go/cluster/cluster_impl.(*failoverClusterInvoker).Invoke(0xc00040e800,
0x11997b8, 0xc0000a4000, 0x11a5ac0, 0xc00038e370, 0xc000237550, 0xc0000bf518)
src/github.com/apache/dubbo-go/cluster/cluster_impl/failover_cluster_invoker.go:80
+0x3c5
github.com/apache/dubbo-go/common/proxy.(*Proxy).Implement.func1.1(0xc00062ec00,
0x2, 0x2, 0xc00062ec00, 0xc00030c440, 0x1d)
src/github.com/apache/dubbo-go/common/proxy/proxy.go:161 +0x542
dubbo.(*GenericClientPool).Call(0x183d880, 0xc0001a23d8, 0x12, 0x0,
0x0, 0xc0001919c0, 0x9, 0x103bbd5, 0xb, 0xc000236cf0, ...)
```
崩溃的位置为：gettyRPCClientPool为nil导致。
出现频率：偶现：
版本：dubbo-go-v1.5.5
初步定为了一下：此处应该是provider上线先时，事件处理流程，与call的处理流程，操作同一invokder导致的panic。
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