ceph-osd crashes with "XFS: possible memory allocation deadlock in kmem_alloc (mode:0x8250)" printed in /var/log/messages

Solution Verified - Updated -

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-osd tasks 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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