Bug 518604

Summary:	Documentation Update for nmi_watchdog and unknown_nmi_panic
Product:	Red Hat Enterprise Linux 6	Reporter:	Qian Cai <qcai>
Component:	kexec-tools	Assignee:	Neil Horman <nhorman>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.0	CC:	qcai, syeghiay
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kexec-tools-2.0.0-25.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-05-14 08:45:33 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 Qian Cai 2009-08-21 08:51:24 UTC

Description of problem:
The following sections of document may need to be updated,

# cat /usr/share/doc/kexec-tools-2.0.0/kexec-kdump-howto.txt
...
Please refrain from simultaneously enabling 'nmi_watchdog' and setting
/proc/sys/kernel/unknown_nmi_panic, as this would result in a Kernel Panic
from legitimate NMIs generated by the nmi_watchdog.
...
When enabling unknown_nmi_panic please be careful not to enable Nmi Watchdog
feature, else the system will panic.
...

Those information might be out of date, since my recent experiences suggest there is no such problem when testing RHEL5.4. In addition, there was a patch went into RHEL5.3 kernel, which looks like fix the above issue mentioned.

[RHEL5][FEAT] The kernel panic occurs if kernel.unknown_nmi_panic=1 is set.
https://bugzilla.redhat.com/show_bug.cgi?id=447618

Version-Release number of selected component (if applicable):
kexec-tools-2.0.0-17.el6

Comment 2 RHEL Program Management 2009-08-21 09:37:42 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Comment 3 Neil Horman 2009-08-23 23:15:50 UTC

concur, I'll remove the out-of-date sections.  Thanks!

Comment 4 Neil Horman 2009-08-24 13:44:54 UTC

fixed in -25.el6.  Thanks!

Comment 5 releng-rhel@redhat.com 2009-10-30 22:11:22 UTC

Fixed in 'kexec-tools-2.0.0-25.el6'. 'kexec-tools-2.0.0-36.el6' included in compose 'RHEL6.0-20091029.0'.
Moving to ON_QA.

Comment 6 James.xu 2009-11-06 08:56:02 UTC

Fixed in 'kexec-tools-2.0.0-39.el6' and 'kexec-tools-2.0.0-37.el6.x86_64' included in compose 'RHEL6.0-20091105.0'.
Moving to VERIFIED.