Ken Giusti created PROTON-905:
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Summary: Long-lived connections leak sessions and links
Key: PROTON-905
URL: https://issues.apache.org/jira/browse/PROTON-905
Project: Qpid Proton
Issue Type: Bug
Components: proton-c
Affects Versions: 0.9.1
Reporter: Ken Giusti
Priority: Blocker
Fix For: 0.10
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.
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