Bug 4479

Summary:	File lastlog becomes huge when using large uid's
Product:	[Retired] Red Hat Linux	Reporter:	Jos Vos <jos>
Component:	shadow-utils	Assignee:	Bernhard Rosenkraenzer <bero>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6.0
Target Milestone:	---
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Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2000-05-23 08:19:35 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Jos Vos 1999-08-11 18:00:27 UTC

When using some high uid numbers (we use 50000 and up for
some special situations), the /var/log/lastlog file becomes
huge, 15+ MB in our case.  Is this according to specs?

On an old RHL 3.0.3 system, the file is only 100 KB, using
the same set of uid's.

Comment 1 Cristian Gafton 1999-09-23 03:17:59 UTC

The bug is in useradd from the shadow-utils.
Fixed in the internal devel tree

Comment 2 Cristian Gafton 1999-09-23 03:30:59 UTC

More information - the size of the struct lastlog is increased under
glibc to ~ 300 bytes. That means that fo 50k uids one would need
15000k space for the lastlog, so the result is expected.


------- Additional Comments From   09/23/99 04:08 -------
I didn't test this with 50k uids, only with about 1500 uids in total,
but some uid numbers were above 50000.  So the question is whether
unused uids also occupy a struct (which would be very bad behaviour,
IMHO).

Comment 3 Cristian Gafton 2000-05-22 15:52:59 UTC

assign to laroche

Comment 4 Bernhard Rosenkraenzer 2000-08-08 15:21:39 UTC

Can't be fixed without changing the internal format of /var/log/lastlog, which
we shouldn't do for interoperability reasons.