Github user oknet commented on the issue:
https://github.com/apache/trafficserver/issues/1412
Maybe I found the reason:
```
3480 int
3481 HttpSM::tunnel_handler_post_ua(int event, HttpTunnelProducer *p)
3482 {
3483 STATE_ENTER(&HttpSM::tunnel_handler_post_ua, event);
3484 client_request_body_bytes = p->init_bytes_done + p->bytes_read;
3485 int64_t alloc_index, nbytes;
3486 IOBufferReader *buf_start;
3487
3488 switch (event) {
3489 case VC_EVENT_INACTIVITY_TIMEOUT:
3490 case VC_EVENT_ACTIVE_TIMEOUT:
...
3520 p->vc->do_io_write(this, nbytes, buf_start);
3521 p->vc->do_io_shutdown(IO_SHUTDOWN_READ);
3522 return 0; // ----> we do not reset vc's timeout
3523 }
```
InactivityCop will callback again in the next second and the default httpsm
handler is tunnel_handler_post().
I think we should handle TIMEOUT event in tunnel_handler_post() since the
timeout event get from ua_session.
I will have a details analysis on it and create a PR to fix this issue.
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