ovirt-engine_3.6_check-patch-el7-x86_64 job failing and stuck

[Roy Golan]

This job is failing with this error

*09:37:48* umount:
/var/lib/mock/epel-7-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/home/jenkins/workspace/ovirt-engine_3.6.1_build-artifacts-el7-x86_64/ovirt-engine:
target is busy*09:37:48*         (In some cases useful info about
processes that*09:37:48*          use the device is found by lsof(8)
or fuser(1).)


and  the rest of the incoming jobs are stuck
http://jenkins.ovirt.org/job/ovirt-engine_3.6_check-patch-el7-x86_64/
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