Bug 216171

Summary:	kexec installation of kernel fails due to overlapping segment detection
Product:	[Fedora] Fedora	Reporter:	gdelx001
Component:	kexec-tools	Assignee:	Neil Horman <nhorman>
Status:	CLOSED NEXTRELEASE	QA Contact:
Severity:	high	Docs Contact:
Priority:	medium
Version:	6	CC:	davej
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:	2006-11-21 16:44:27 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 gdelx001 2006-11-17 16:35:45 UTC

Description of problem:

Forcing dump under kdump failed with explanation that dump kernel wasn't
installed, so investigated manually installing dump kernel.  Oh, and yes, there
was a properly formed crashkernel=128M@16M option on the boot commandline, plus
the appropriate region appeared carved out in /proc/iomem.  Incidentally there
was nothing in syslog that indicated that dump kernel installation had failed.

Using the kexec installation line from /etc/init.d/kdump:
/sbin/kexec -p --args-linux --command-line="ro root=/dev/VolGroup00/LogVol00
rhgb quiet" --initrd=/boot/initrd-2.6.18-1.2849.fc6kdump.img
/boot/vmlinux-2.6.18-1.2849.fc6kdump

I got the message:

Overlapping memory segments at 0x1460000
sort_segments failed

This may be similar or identical to a bug reported against kexec w/ x86-64 on
the fastboot mailing list around the beginning of October, and may require
tweaking the dump kernel.  Incidentally, there is no kernel-kdump component in
bugzilla presently to speculatively report this problem against.


Version-Release number of selected component (if applicable):
kexec-tools-1.101-51.fc6
2.6.18-1.2849.fc6kdump

How reproducible:
always

Steps to Reproduce:
1.run kexec line above
2.
3.
  
Actual results:
Overlapping memory segments at 0x1460000
sort_segments failed


Expected results:
installed kernel

Additional info:
Installing the dump kernel is a crucial first step in an attempt to detect a
quiet, frequent lockup of an x86-64 system under Fedora Core 6.

Comment 1 Neil Horman 2006-11-21 16:44:27 UTC

Hey!  Thanks for the report.  This is actually a kernel bug though, that results
from overlapping physical address for program headers getting written into the
compiled kdump kernel.  you need this patch for your kernel:
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=dbaab49f92ff6ae6255762a948375e4036cbdbd2

It just got added to Linus' tree today, so I expect Dave J. will have it in the
FC-6 kernel shortly.