vmamidi commented on issue #7521:
URL: https://github.com/apache/trafficserver/issues/7521#issuecomment-791163343
> A "bt full" would be useful, although I would really only need the bottom
4-5 frames (particularly the arguments to `Warn_Blocked`).
>
> OTOH, consider the bottom of the stack
>
> ```
>
/some/path/bin/traffic_server(OutboundConnTrack::TxnState::Warn_Blocked(OutboundConnTrack::TxnConfig
const*, long, int, sockaddr const*, char const*)+0x41)[0x55978718cd11]
>
/some/path/bin/traffic_server(HttpSM::do_http_server_open(bool)+0x1455)[0x55978719a745]
>
/some/path/bin/traffic_server(HttpSM::set_next_state()+0x32e)[0x5597871b089e]
>
/some/path/bin/traffic_server(HttpSM::send_origin_throttled_response()+0x10e)[0x5597871a2d2e]
>
/some/path/bin/traffic_server(HttpSM::do_http_server_open(bool)+0x12d8)[0x55978719a5c8]
> ```
>
> Why is `HttpSM::do_http_server_open` on the stack twice? We should look at
that.
I think this can happen if the request is going to a parent. When number of
"origin server" grouped connections to a parent reaches maximum, next parent
configured for that origin server.
void
HttpSM::send_origin_throttled_response()
{
// if the request is to a parent proxy, do not reset
// t_state.current.attempts so that another parent or
// NextHop may be tried.
if (t_state.current.request_to != HttpTransact::PARENT_PROXY) {
t_state.current.attempts =
t_state.txn_conf->connect_attempts_max_retries;
}
t_state.current.state = HttpTransact::OUTBOUND_CONGESTION;
call_transact_and_set_next_state(HttpTransact::HandleResponse);
}
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