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Bug 599737

Summary:	vm.drop_caches corrupts hugepages and causes Oracle Database ORA-600 crashes [rhel-5.5.z]
Product:	Red Hat Enterprise Linux 5	Reporter:	RHEL Program Management <pm-rhel>
Component:	kernel	Assignee:	Jiri Pirko <jpirko>
Status:	CLOSED ERRATA	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	high	Docs Contact:
Priority:	high
Version:	5.4	CC:	aarcange, dhoward, emcnabb, jarod, jpirko, lwang, lwoodman, pm-eus, qcai, riel, rkhan
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Issuing the "sysctl -w vm.drop_caches=1" command on a system running a database backed by HugePages caused memory corruption errors. This update fixes this issue by ensuring that the HugePages "dirty bit" is properly set, with the result that corruption no longer occurs when dropping the virtual memory caches.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-07-01 18:29:47 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:	579469
Bug Blocks:

Description RHEL Program Management 2010-06-03 19:58:04 UTC

This bug has been copied from bug #579469 and has been proposed
to be backported to 5.5 z-stream (EUS).

Comment 3 Jiri Pirko 2010-06-07 13:31:51 UTC

in 2.6.18-194.6.1.el5

Comment 7 Douglas Silas 2010-06-28 20:46:34 UTC

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:
Issuing the "sysctl -w vm.drop_caches=1" command on a system running a database backed by HugePages caused memory corruption errors. This update fixes this issue by ensuring that the HugePages "dirty bit" is properly set, with the result that corruption no longer occurs when dropping the virtual memory caches.

Comment 9 errata-xmlrpc 2010-07-01 18:29:47 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 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-2010-0504.html