Silocean opened a new issue, #3068:
URL: https://github.com/apache/brpc/issues/3068
**Describe the bug**
服务开启enable_rpcz后，上线跑一段时间就会内存暴涨然后core掉，经排查定位发现在destroy()中存在内存重复释放问题。
```
void Span::destroy() {
EndAsParent();
Span* p = _next_client;
while (p) {
if (p == this) {
LOG(ERROR) << "Span next_client points to self, span_id=" <<
p->_span_id;
}
Span* p_next = p->_next_client;
p->_info.clear();
butil::return_object(p);
p = p_next;
}
_info.clear();
butil::return_object(this);
}
```
如上代码，ERROR日志是我debug时加的，经过验证在服务core掉时确实打印了该行日志。
说明span链表中有span异常指向了自身。
这个问题的根源是什么？新版本是否有解决该问题？
**To Reproduce**
**Expected behavior**
**Versions**
OS: centos7.6
Compiler: gcc4.8.5
brpc: 0.9.0
protobuf:
**Additional context/screenshots**
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