XFS: possible memory allocation deadlock in kmem_alloc (mode:0x250)

[Yann Dupont]

Le 03/12/2013 13:50, Dave Chinner a écrit :
> On Tue, Dec 03, 2013 at 10:53:58AM +0100, Emmanuel Lacour wrote:
> OK, 32GB RAM, no obvious shortage, no dirty or writeback data. 2TB 
> SATA drives, 32AGs, only unusual setting is 64k directory block size. 
> Yup, there's your problem:

I can confirm I also saw this from times to times, in the very same 
context (ceph OSD, xfs volume with 64k directory blocks)

I never took the time to fully report the problem because it was very 
sporadic, and I suspected a specific option in my hand-made kernels, in 
which the problem seems to occurs more  often. With the 'standard' 
debian 3.10.2 (from testing) I never saw the problem (56 days uptime)

cf http://tracker.ceph.com/issues/6301

the report isn't complete here ... sometimes I just have the deadlock, 
but without oops.
can try to dig deeper inmy old logs to be sure it's really the same

Cheers,

-- 
Yann Dupont - Service IRTS, DSI Université de Nantes
Tel : 02.53.48.49.20 - Mail/Jabber : Yann.Dupont at univ-nantes.fr