From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050922 Fedora/1.0.7-1.1.fc4 Firefox/1.0.7 Description of problem: There is a sporadic bug in the AMTU memory separation test which can be seen on IA64 using the following command: while amtu; do true; done Eventually the command will fail because it successfully accessed memory which it believes it should not be able to access. The problem is the result of a faulty random number generation routine which incorrectly generates a random access within a specified range. While I have only seen this IA64 it is reasonable to assume that other 64bit platforms would be affected. Version-Release number of selected component (if applicable): amtu-1.0.2-2.EL4 How reproducible: Always Steps to Reproduce: 1. while amtu; do true; done Actual Results: Memory Test SUCCESS! Executing Memory Test... Executing Memory Separation Test... value of address: 40600 Memory Separation Test FAILED! Expected Results: Executing Memory Test... Memory Test SUCCESS! Executing Memory Separation Test... Memory Separation Test SUCCESS! Executing Network I/O Tests... Network I/O Controller Test SUCCESS! Executing I/O Controller - Disk Test... I/O Controller - Disk Test SUCCESS! Executing Supervisor Mode Instructions Test... Privileged Instruction Test SUCCESS! Additional info:
Created attachment 121721 [details] patch to amtu-1.0.2 which solves the problem This patch made against the sources in the source RPM for amtu-1.0.2-2.EL4 fixes the problem.
Paul, was this bug observed on x86_64 or any other 64 bit arch?
Linda Knippers ran AMTU on x86_64 in a loop for about 30 minutes and did not see any problems, however, it is uncertain if this is due to luck or design. IA64 and x86_64 are the only two 64 bit platforms that I have available which will run RHEL4.
amtu-1.0.2-4.EL4 was built with this patch applied.
We have been unable to reproduce the problem on pSeries, iSeries, or s390x.
This issue is on Red Hat Engineering's list of planned work items for the upcoming Red Hat Enterprise Linux 4.4 release. Engineering resources have been assigned and barring unforeseen circumstances, Red Hat intends to include this item in the 4.4 release.
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/RHBA-2006-0339.html