** Changed in: util-linux (Ubuntu)
   Importance: Undecided => Low

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  system with high numbered uids has huge sparse /var/log/lastlog

Status in util-linux package in Ubuntu:

Bug description:
  I was investigating the use of a single high UID user (ie, 2000000000)
  and discovered that /var/log/lastlog grew to an enormously large
  sparse file:

  $ ls -lh /var/log/lastlog 
  -rw-rw-r-- 1 root utmp 544G Jul 27 12:35 /var/log/lastlog

  The file is actually quite small though:
  $ ls -lh --size /var/log/lastlog 
  56K -rw-rw-r-- 1 root utmp 544G Jul 27 12:35 /var/log/lastlog

  On a standalone system, this is possibly not a problem since it is
  highly unlikely that a system will have 2 billion users, but this is
  confirmed to wreak havoc on rsync backups.

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