ceph-osd crashes with "XFS: possible memory allocation deadlock in kmem_alloc (mode:0x8250)" printed in /var/log/messages
Issue
- The following messages printed to
/var/log/messages:
[Fri Aug 21 09:10:28 2015] XFS: possible memory allocation deadlock in kmem_alloc (mode:0x8250)
ceph-osdtasks get killed when the above messages appear- Dropping caches via the following command alleviates the issue immediately, however the issue returns after a random amount of time.
# echo '3' > /proc/sys/vm/drop_caches
Environment
- Red Hat Ceph Storage 1.3
- Red Hat Enterprise Linux 7
- kernel 3.10.0-123.20.1.el7.x86_64
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