Bug 181046

Summary:	upgrade hangs mmapping huge lastlog
Product:	[Fedora] Fedora	Reporter:	Mark Montague <monty>
Component:	shadow-utils	Assignee:	Peter Vrabec <pvrabec>
Status:	CLOSED RAWHIDE	QA Contact:	David Lawrence <dkl>
Severity:	high	Docs Contact:
Priority:	medium
Version:	3
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-02-13 13:42:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mark Montague 2006-02-12 08:58:23 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.0.1) Gecko/20060208 Debian/1.5.dfsg+1.5.0.1-1 Firefox/1.5.0.1

Description of problem:
I installed fc3 minimal, then tried to do up2date -u -- I tracked it down to upgrading shadow-utils. I downloaded shadow-utils-4.0.3-56.x86_64.rpm and tried to install by hand, and it hung, and top showed that it is using over a terabyte of virtual memory. I straced it, and found it was mmapping /var/log/lastlog, which, possibly because something "logged in" as nfsnobody, was (sort of) a >1 terabyte file (yeah, I know it's really a sparse file, as described in https://www.redhat.com/archives/fedora-list/2005-March/msg00076.html but apparently mmap doesn't fully understand that, or at least does something stupid. As a workaround, I rm -f'ed /var/log/lastlog and installed the rpm, but it's clearly broken, and took me many hours to figure out. 

Version-Release number of selected component (if applicable):
shadow-utils-4.0.3-56

How reproducible:
Didn't try

Steps to Reproduce:
1.
2.
3.
  

Additional info:

I don't see an easy way of getting the /var/log/lastlog file to go into "huge" mode again without scratch installing the whole system, which I really don't have time to do right now-- sorry.

Comment 1 Mark Montague 2006-02-12 09:06:07 UTC

oops, I didn't fully describe the hang (and didn't proofread too well, sorry),
and I'm guessing (but haven't tested) that the way to duplicate is to:

-- scratch install fc3 from iso images, choose minimal install
-- download shadow-utils-4.0.3-56.x86_64.rpm
-- rpm -v -i shadow-utils-4.0.3-56.x86_64.rpm
-- look! it hangs and top thinks it's using a terabyte of VM!

this assumes that whatever made a lastlog entry for nfsnobody during my install
is repeatable. But from googling, it appears that the huge lastlog file is not
too rare an issue for 64bit fedora/rh systems.

Comment 2 Peter Vrabec 2006-02-13 13:42:50 UTC

This bug is fixed in FC-4.

Huge lastlog file was created during nfs-utils instalation on 64bit platforms.

>I don't see an easy way of getting the /var/log/lastlog file to go into "huge"
>mode again without scratch installing the whole system, which I really don't
have >time to do right now-- sorry.
There's no need to do this.