Quoting Sage Weil (2013-06-11 11:43:30)
> I'm also seeing this hang regularly with both 3.9 and 3.10-rc5.  Is this
> is a known problem?  In this case there is no powercycling; just a regular
> ceph-osd workload.

Everyone here is waiting for the root node, but it isn't immediately
clear who has the lock.  log_one_extent is the most likely suspect, but
I can't see how it would be scheduling with the root lock held.

Could you please sysrq-w?

-chris
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