Peer server hangs after stopping corosync

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Hi, we have four Ubuntu 14.04 two-nodes corosync/pacemaker clusters with the same strange behavior. When we stop the corosync daemon in a node the other cluster member hangs. Where "hangs" means that the server receive a NMI in the case of physical machines (HP Proliant DL380e G8) and in the case of virtual machines the corosync-* commands don't give any output (I have to cancel the execution with CTRL+C) we have no log and no corosync reponse at all (to recover we have to reset the server).

Versions:

pacemaker: 1.1.10+git20130802-1ubuntu2.
corosync: 2.3.3 (also verified 2.3.4 version with same behavior)

I attach corosync.conf and last lines of syslog before NMI + reboot.

Regards.

Attachment: corosync.conf
Description: Binary data

Attachment: syslog
Description: Binary data

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