** Description changed:

  I'm doing backup of a running mongodb using LVM snapshot. Sometimes I
  run into a deadlock situation and kernel reports blocked tasks for jbd2,
  mongod, dmeventd and my tar doing backup.
  This happens very rarely (one in a thousand) but the effect is rather
  severe as mongodb stops working. I also can't remove and unmount the
  I have Ubuntu 16.04.1 (lvm2 2.02.133-1ubuntu10) with mongod 3.2.9 on a
  64bit system.
- According to the link below its a kernel race fixed in latest lvm2
- package.
+ According to the link below its a kernel race with considerably
+ decreased chance in latest lvm2 package.

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  deadlock during lvm snapshot

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