[Bug 1645636] Re: deadlock during lvm snapshot

[Tomaz Beltram]

** 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
  snapshot.
  
  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.
  
  https://www.redhat.com/archives/linux-lvm/2016-November/msg00037.html

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https://bugs.launchpad.net/bugs/1645636

Title:
  deadlock during lvm snapshot

Status in lvm2 package in Ubuntu:
  Confirmed

Bug description:
  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
  snapshot.

  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 with considerably
  decreased chance in latest lvm2 package.

  https://www.redhat.com/archives/linux-lvm/2016-November/msg00037.html

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