- **status**: accepted --> review
---
** [tickets:#3050] amfd: stuck in infinite loop if controller failover occurs
during split network**
**Status:** review
**Milestone:** 5.19.06
**Created:** Wed Jun 05, 2019 03:45 AM UTC by Gary Lee
**Last Updated:** Wed Jun 05, 2019 03:46 AM UTC
**Owner:** Gary Lee
If SC absence is enabled, amfd can sometimes get stuck in an infinite loop
processing compcsi and sisu sync messages, if a controller failover occurs
during a split network event.
Steps to reproduce:
1. Enable SC absence
2. Put active SC [SC-1] and 1 payload in a network partition. Thus the
cluster is split into 2 partitions:
* Smaller partition: active SC [SC-1]+ 1 payloads
* Bigger partition: standby SC [SC-2] + the remaining payloads
3. Block active SC [SC-1] from consensus service causing it to
self-fence
4. Merge network
5. SC-2 will receive sync messages from a PL that will loop forever in
AMFD causing a node failfast
2019-06-05 12:52:31.833 SC-2 osafamfd[254]: NO Receive message with event
type:12, msg_type:31, from node:2030f, msg_id:0
2019-06-05 12:52:31.834 SC-2 osafamfd[254]: NO Receive message with event
type:13, msg_type:32, from node:2030f, msg_id:0
---
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