How I was able to reproduce the bug:
1. Install and configure a postgresql with streaming replication
2. Install and configure pacemaker and corosync (controlling the postgres 
cluster)
3. When both servers are operational, something like:
* Node psql1:
    + master-pgsql                      : 1000
    + pgsql-data-status                 : LATEST
    + pgsql-master-baseline             : 00000000F4000090
    + pgsql-status                      : PRI
* Node psql2:
    + master-pgsql                      : 100
    + pgsql-data-status                 : STREAMING|SYNC
    + pgsql-status                      : HS:sync
    + pgsql-xlog-loc                    : 00000000F6030D60

Reboot one of the servers, slave or master.
4. Run: corosync-cmapctl, it will freeze and never return.

I was able to reproduce this every single time wit libqb 0.16.0
With libqb 0.17.0 I was not able to reproduce this scenario.

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https://bugs.launchpad.net/bugs/1341496

Title:
  corosync hangs inside libqb

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