I found this issue while debugging a crash dump of qpidd.
Long lived connections do not free its sessions/link.
This only applies when NOT using the event model. The version of qpidd I tested against (0.30) still uses the iterative model. Point to consider, I don't know why this is the case.
Details: I have a test script that opens a single connection, then continually creates sessions/links over that connection, sending one message before closing and freeing the sessions/links. See attached.
Over time the qpidd run time consumes all memory on the system and is killed by OOM. To be clear, I'm using drain to remove all sent messages - there is no message build up.
On debugging this, I'm finding thousands of session objects on the connections free sessions weakref list. Every one of those sessions has a refcount of one.
Once the connection is finalized, all session objects are freed. But until then, freed sessions continue to accumulate indefinitely.