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

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On Tue, Feb 10, 2015 at 3:58 AM, Christopher Armstrong
<chris@xxxxxxxxxxxx> wrote:
>
> 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.


The crash didn't happen immediately after 'ceph: mds0 caps stale', I
have no idea what went wrong.  Could you setup 'netconsole' to get
call trace of the kernel crash.

Regards
Yan, Zheng

>
> Thanks,
>
> Chris
>
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