Bug 174767

Summary: Memory separation test can fail on 64bit platforms
Product: Red Hat Enterprise Linux 4 Reporter: Paul Moore <paul.moore>
Component: amtuAssignee: Steve Grubb <sgrubb>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: andriusb, dhoward, jburke, linda.knippers
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: RHBA-2006-0339 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-08-10 21:12:59 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:
Bug Depends On:    
Bug Blocks: 175213, 176155, 181409    
Attachments:
Description Flags
patch to amtu-1.0.2 which solves the problem none

Description Paul Moore 2005-12-01 23:25:12 UTC 
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:
Comment 1 Paul Moore 2005-12-01 23:27:31 UTC 
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.
Comment 2 Steve Grubb 2005-12-05 15:46:17 UTC 
Paul, was this bug observed on x86_64 or any other 64 bit arch?
Comment 3 Paul Moore 2005-12-05 16:06:28 UTC 
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.
Comment 4 Steve Grubb 2005-12-05 22:47:04 UTC 
amtu-1.0.2-4.EL4 was built with this patch applied.
Comment 5 Debora Velarde 2005-12-06 16:50:30 UTC 
We have been unable to reproduce the problem on pSeries, iSeries, or s390x.
Comment 8 Bob Johnson 2006-04-11 15:57:19 UTC 
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.
Comment 12 Red Hat Bugzilla 2006-08-10 21:13:00 UTC 
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