Bug 690921 – Fix compaction deadlock with SLUB and loop over tmpfs

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Bug 690921 - Fix compaction deadlock with SLUB and loop over tmpfs

Summary:	Fix compaction deadlock with SLUB and loop over tmpfs

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:	Red Hat Kernel QE team
Docs Contact:

URL:
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Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2011-03-25 16:06 EDT by Andrea Arcangeli
Modified:	2011-05-19 08:00 EDT (History)
CC List:	1 user (show)

See Also:
Fixed In Version:	kernel-2.6.32-130.el6
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-05-19 08:00:03 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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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 2011-03-25 16:06:05 EDT

Description of problem: a deadlock might happen if the kernel is configured with SLUB and loop over tmpfs is used if compaction is enabled (even if THP is off).


Version-Release number of selected component (if applicable): 6.0/6.1/master


How reproducible: not reproducible (probably impossible to reproduce with RHEL6.0 and RHEL6.1 because of SLAB being selected instead of SLUB)


Steps to Reproduce:
1. build the kernel with CONFIG_COMPACTION=y and CONFIG_SLUB=y
2. create a loop over tmpfs
3. copy data to loop device (writes to the loop device that require writeback)
  
Actual results: it must not deadlock


Expected results: it might deadlock (reproduced only once by Hugh with a modified tmpfs/shmem code, not reproducible)

Comment 1 Andrea Arcangeli 2011-03-25 16:12:18 EDT

Patch submitted to rhkernel-list with Message-ID: <20110325201201.GA29142@random.random>

Comment 4 Aristeu Rozanski 2011-04-07 10:14:54 EDT

Patch(es) available on kernel-2.6.32-130.el6

Comment 8 errata-xmlrpc 2011-05-19 08:00:03 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

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