There is a regression in librbd in v0.94.4 that can cause VMs to crash.  
For now, please refrain from upgrading hypervisor nodes or other librbd 
users to v0.94.4.

        http://tracker.ceph.com/issues/13559

The problem does not affect server-side daemons (ceph-mon, ceph-osd, 
etc.).

Jason's identified the bug and has a fix prepared, but it'll probably take 
a few days before we have v0.94.5 out.

        
https://github.com/ceph/ceph/commit/4692c330bd992a06b97b5b8975ab71952b22477a

Thanks!
sage
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