7dae3ceaa0
A server can only be deleted if there is no elements which reference it. This is taken care via srv_check_for_deletion(), most notably for active and idle connections. A special case occurs for connections directly managed by a session. This is for so-called private connections, when using http-reuse never or H2 + http-reuse safe for example. In this case. server does not account these connections into its idle lists. This caused a bug as the server is deleted despite the session still being able to access it. To properly fix this, add a new referencing element into the server for these session connections. A mt_list has been chosen for this. On default http-reuse, private connections are typically not used so it won't make any difference. If using H2 servers, or more generally when dealing with private connections, insert/delete should typically occur only once per session lifetime so impact on performance should be minimal. This should be backported up to 2.4. Note that srv_check_for_deletion() was introduced in 3.0 dev tree. On backport, the extra condition in it should be placed in cli_parse_delete_server() instead.