@xuelangos 请按照 Bug report 格式提问。

### Ⅰ. Issue Description

### Ⅱ. Describe what happened

### Ⅲ. Describe what you expected to happen

### Ⅳ. How to reproduce it (as minimally and precisely as possible)

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### Ⅴ. Anything else we need to know?

1. If applicable, add nginx  [debug log doc](http://nginx.org/en/docs/debugging_log.html).
2.
3.

### Ⅵ. Environment:

- Tengine version (use `sbin/nginx -V`):
- OS (e.g. from /etc/os-release):
- Kernel (e.g. `uname -a`):
- Others: