Oliver, from the lastlog(8) manpage:
The lastlog file is a database which contains info on the
last login of each user. You should not rotate it. It is a
sparse file, so its size on the disk is usually much smaller
than the one shown by "ls -l" (which can indicate a
This is affecting Ubuntu 20.04 with sssd integration to AD. I am seeing
massive lastlog files because of what appears to be the use of very high
UID's being assigned to AD users when they log in.
-rw-rw-r-- 1 root utmp88943346292 Jan 6 16:50
lastlog
Oliver
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Someone needs to take on all the affected systems, PAM, users etc to
find a fix.
In redhat this has been an open issue since 2013. If anybody sees this
hopefully it will direct interested parties to places where other people
are talking about the same issue.
This also becomes an issue in Docker
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: util-linux (Ubuntu)
Status: New => Confirmed
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: pam (Ubuntu)
Status: New => Confirmed
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: shadow (Ubuntu)
Status: New => Confirmed
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I don't see what we can be expected to do with this bug report. This is
the defined file format for /var/log/lastlog.
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** Also affects: shadow (Ubuntu)
Importance: Undecided
Status: New
** Also affects: pam (Ubuntu)
Importance: Undecided
Status: New
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** Tags added: artful
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https://bugs.launchpad.net/bugs/1707645
Title:
system with high numbered uids has huge sparse /var/log/lastlog
Status in
** Changed in: util-linux (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1707645
Title:
system with high numbered uids has
FYI, people using rsync for backups might be interested in the --sparse
(-S) option.
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https://bugs.launchpad.net/bugs/1707645
Title:
system with high
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