warning in error_log when using websocket tunnel

[jean-frederic clere]

Hi,

I have the warnings in error_log when a web socket is opened at the 
shutdown time:

+++
[Fri Feb 12 16:10:39.243444 2021] [core:warn] [pid 2879580:tid 
140162655000576] AH00045: child process 2879590 still did not exit, 
sending a SIGTERM
[Fri Feb 12 16:10:41.245444 2021] [core:warn] [pid 2879580:tid 
140162655000576] AH00045: child process 2879590 still did not exit, 
sending a SIGTERM
+++

ap_proxy_tunnel_run()

there is:
+++
    do {
        const apr_pollfd_t *results;
        apr_int32_t nresults, i;

        ap_log_rerror(APLOG_MARK, APLOG_TRACE8, 0, r,
                      "proxy: %s: polling (client=%hx, origin=%hx)",
                      scheme, client->pfd->reqevents, 
origin->pfd->reqevents);
        do {
            rv = apr_pollset_poll(pollset, timeout, &nresults, &results);
        } while (APR_STATUS_IS_EINTR(rv));
+++

I don't remember why we have the while here...
Is there a way to test why the get the signal in ap_proxy_tunnel_run() 
and react on shutdown command to prevent the warning message?

--
Cheers

Jean-Frederic