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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Those information might be out of date, since my recent experiences suggest there is no such problem when testing RHEL5.4.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

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.

concur, I'll remove the out-of-date sections.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

fixed in -25.el6.  Thanks!

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.

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.