[Bug 593086] Re: Silent wraparound on > 2 TB LVM snapshots

[Phillip Susi]

** Description changed:

  Ubuntu kernels silently wrap access to disk locations above 2 TB back
  around to zero.  This can easily be reproduced using lvm to create a
  thin provisioned virtual disk:
  
- lvcreate --type zero -L 3t -n empty vg0
- lvcreate -s -n thin vg0/zero -L 1g
+ lvcreate -s -n thin -L 1g --virtualsize 3t vg0
  
  mke2fs -t ext4 -E lazy_itable_init /dev/vg0/thin
  e2fsck -f /dev/vg0/thin
  
  Fsck will find errors in the bitmap because it is actually reading the
  superblock instead of the allocation bitmap situated just after the 2 tb
  mark.

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Silent wraparound on > 2 TB LVM snapshots
https://bugs.launchpad.net/bugs/593086
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