Bug 687918 – thp+memcg-numa: fix BUG at include/linux/mm.h:370!

Bugzilla will be upgraded to version 5.0. The upgrade date is tentatively scheduled for 2 December 2018, pending final testing and feedback.

Bug 687918 - thp+memcg-numa: fix BUG at include/linux/mm.h:370!

Summary:	thp+memcg-numa: fix BUG at include/linux/mm.h:370!

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	6.1
Hardware:	Unspecified Unspecified

Priority	unspecified Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Andrea Arcangeli
QA Contact:	Caspar Zhang
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2011-03-15 13:48 EDT by Andrea Arcangeli
Modified:	2013-07-03 03:28 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:	kernel-2.6.32-128.el6
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-05-19 08:00:00 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0542	normal	SHIPPED_LIVE	Important: Red Hat Enterprise Linux 6.1 kernel security, bug fix and enhancement update	2011-05-19 07:58:07 EDT

Groups: None (edit)

Description Andrea Arcangeli 2011-03-15 13:48:48 EDT

Description of problem: with CONFIG_NUMA=n and memcg and transparent hugepage enabled, there could be a double free later leading to VM_BUG_ON in get_page().

How reproducible: only reproducible on x86-64 with CONFIG_NUMA=n but all x86-64 kernels with transparent hugepage support enabled should have CONFIG_NUMA=y. So it shouldn't be reproducible.


Steps to Reproduce:
1. build RHEL6 with CONFIG_NUMA=n, CONFIG_TRANSPARENT_HUGEPAGE=y
2. enable memcg
3. exaust the memcg limit from regular allocations and swapout
4. swapin
5. after swapin khugepaged will fail the compaction with memcg exausted -> bug
  
Actual results:

double free and oops

Expected results:

khugepaged should fail silently without double free or oopses


Additional info: It shouldn't be reproducible in RHEL6/6.1 because all x86-64 kernels have CONFIG_NUMA=y.

Comment 2 Andrea Arcangeli 2011-03-15 13:55:03 EDT

Fix posted to rhkernel-list with Message-ID: <20110315175252.GQ10696@random.random>.

Comment 3 RHEL Product and Program Management 2011-03-16 06:09:53 EDT

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Comment 4 Aristeu Rozanski 2011-03-30 10:33:10 EDT

Patch(es) available on kernel-2.6.32-128.el6

Comment 9 errata-xmlrpc 2011-05-19 08:00:00 EDT

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-2011-0542.html

Note You need to log in before you can comment on or make changes to this bug.