Chuck Rolke created DISPATCH-1136:
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Summary: Receiver crash due to data corruption on multicast
presettled messages
Key: DISPATCH-1136
URL: https://issues.apache.org/jira/browse/DISPATCH-1136
Project: Qpid Dispatch
Issue Type: Bug
Components: Routing Engine
Affects Versions: 1.3.0
Environment: Fedora 27
Three routers connected serially as described in DISPATCH-1124
Reporter: Chuck Rolke
Assignee: Chuck Rolke
After applying the fixes from DISPATCH-1124 and DISPATCH-1129 receivers in
long-running multicast presettled tests still fail with corrupted data
sequences. There is no single symptom but several:
* Receivers use all system memory and cache and getting hit by the OOM killer
* underrun
* illegal value for field
Research shows that function qdr_forward_drop_presettled_CT_LH is routinely
dropping presettled deliveries that have already made forward progress in
transmitting bytes to the wire. After that happens there is a race condition as
to whether the message is successfully transmitted or the message is torn down
in the middle of transmission.
For reproducing this error the sender must supply messages significantly faster
than the receiving router can forward them to the next router. This triggers
the presettled drops. My test setup does this by having the sender and the
receiving router on the same laptop and having the next router connected over a
relatively slow WiFi.
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