Lua's fake requests remain uncleaned in successful cases

Recently I have had difficulties with such error:
2017/06/07 04:10:42 [alert] 4579#0: *35005 1024 worker_connections are not enough while connecting to upstream

What I found out:
If I'm right, the connections do not close in successful cases in all ngx_http_lua_ssl*_ modules.

Usually connections are created:

fc = ngx_http_lua_create_fake_connection(NULL);

However, the cleaning function is only called in unsuccessful cases:

failed:

    if (r && r->pool) {
        ngx_http_lua_free_fake_request(r);
    }

    if (fc) {
        ngx_http_lua_close_fake_connection(fc);
    }

In successful cases, a handler just return a value:

    if (rc >= NGX_OK || rc == NGX_ERROR) {
        cctx->done = 1;
        ...
        ngx_log_debug2(...);
        ...
        return <something "good">;
    }

Maybe I don't understand something in the architecture, but inserting the cleanup code before returning the "good" value helped me.

Start by inspecting the ngx_http_lua_ssl_* modules and compare their successful return paths with the shown failed path. Reproduce or verify whether fake requests and connections remain open after successful cases, then confirm that all relevant paths clean them up without breaking existing behavior.