kernel crash after 'ceph: mds0 caps stale' and 'mds0 hung' -- issue with timestamps or HVM virtualization on EC2?

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Hi folks,

One of our users is seeing machine crashes almost daily. He's using Ceph v0.87 giant, and is seeing this crash: https://gist.githubusercontent.com/ianblenke/b74e5aa5547130ebc0fb/raw/c3eeab076310d149443fd6118113b9d94f176303/gistfile1.txt

It seems easy to trigger this by rsyncing to the CephFS mount. We're using the kernel client here, so I'm wondering if it's related to this timestamp bug: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2015-January/045838.html

Does anyone have any insight into the crash? Some confirmation that it's related to system clocks/timestamps would be helpful.

Another note is that we're using HVM virtualization on EC2. Not sure if people have run into this before or not.

Thanks,

Chris
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