On Mon, Sep 8, 2014 at 2:53 PM, Francois Deppierraz <[email protected]> wrote:
> > > XFS: possible memory allocation deadlock in kmem_alloc (mode:0x250) > > All logs from before the disaster are still there, do you have any > advise on what would be relevant? > > This is a problem. It's not necessarily a deadlock. The warning is printed if the XFS memory allocator has to retry more than 100 times when it's trying to allocate memory. It either indicates extremely low memory, or extremely fragmented memory. Either way, your OSDs are sitting there trying to allocate memory instead of doing something useful. By any chance, does your ceph.conf have: osd mkfs options xfs = -n size=64k If so, you should start planning to remove that arg, and reformat every OSD. Here's a thread where I discussion my (mis) adventures with XFS allocation deadlocks: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2014-July/041336.html
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