Escalated to Bugzilla from IssueTracker
This might be related to bug 163210.
Created attachment 117800 [details] patch to resolve machine check error regression on AMD64 This patch was posted to rhkernel 8/16/05. It has been tested and resolves this BZ.
A fix for this problem has just been committed to the RHEL3 U6 patch pool this evening (in kernel version 2.4.21-35.EL).
I confirmed the bug is fixed on 2.4.21-35.EL and diskdump works on hammer1.lab.boston.
*** Bug 167222 has been marked as a duplicate of this bug. ***
I confirmed the bug is fixed on re0902 iso.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-663.html