Because the RT kernel sets CONFIG_STRICT_DEVMEM, the crash program cannot run on a live system. The crash module (used in RHEL and Fedora) solves this problem. The crash module source is available in the upstream crash program source tar-ball.
Created attachment 482138 [details] Current crash module This is the crash module from crash-5.1.2
Created attachment 482139 [details] Makefile for crash module The included Makefile for the crash module
Where is the upstream source for this? If I am to really use the 1.1 version, then there are some other files that need to be modified too. Thanks
It is included in the upstream crash program source available at http://people.redhat.com/anderson The changelog comment at http://people.redhat.com/anderson/crash.changelog#5_1_2 explains how to build and use it.
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: Cause: The realtime kernel has CONFIG_STRICT_DEVMEM set Consequence: The crash tool cannot run on a live system Fix: use the crash kernel module, as used in RHEL and Fedora. Result: crash now runs on a live system.
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 therefore 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-2011-1253.html