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

[Phillip Susi]

** Changed in: linux (Ubuntu)
    Milestone: None => lucid-updates

** Changed in: linux (Ubuntu)
    Milestone: lucid-updates => karmic-updates

** Changed in: linux (Ubuntu)
    Milestone: karmic-updates => None

** 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 -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.
+ 
+ See comment #26 for details on the problem and what needs done to fix
+ it.

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