Public bug reported:
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.
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1707645
Title:
system with high numbered uids has huge sparse /var/log/lastlog
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