Attaching ISO domain has resulted in fencing of SPM hypervisor

Solution In Progress - Updated -

Issue

Attaching ISO domain has resulted in fencing of SPM hypervisor.
spm-lock.log reports this error:

[2014-08-27 13:55:15] Lease acquired sdUUID=50885a30-5bec-4b34-98ed-ed3c3306bad0 id=3 lease_path=/rhev/data-center/mnt/10.10.10.10:_var_lib_exports_iso/50885a30-5bec-4b34-98ed-ed3c3306bad0/dom_md/leases, TS=1409147713666790
[2014-08-27 13:55:15] Protecting spm lock for vdsm pid 71254
[2014-08-27 13:55:15] Started renewal process (pid=21899) for sdUUID=50885a30-5bec-4b34-98ed-ed3c3306bad0 id=3 lease_path=/rhev/data-center/mnt/10.10.10.10:_var_lib_exports_iso/50885a30-5bec-4b34-98ed-ed3c3306bad0/dom_md/leases
[2014-08-27 13:55:21] Fencing sdUUID=50885a30-5bec-4b34-98ed-ed3c3306bad0 id=3 lease_path=/rhev/data-center/mnt/10.10.10.10:_var_lib_exports_iso/50885a30-5bec-4b34-98ed-ed3c3306bad0/dom_md/leases
/bin/kill -USR1 71254

Environment

Red Hat Enterprise Virtualziation (RHEV) 3.3

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