Bug 595827

Summary:	page refcount leak in cifs
Product:	Red Hat Enterprise Linux 6	Reporter:	Jeff Layton <jlayton>
Component:	kernel	Assignee:	Jeff Layton <jlayton>
Status:	CLOSED CURRENTRELEASE	QA Contact:	yanfu,wang <yanwang>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.0	CC:	rwheeler, steved, yanwang
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2010-11-11 15:53:37 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:

Description Jeff Layton 2010-05-25 17:51:18 UTC

One of the patches for bug 591483 introduces a page refcount leak. Machines that have CIFS filesystems under heavy I/O (particularly for reads) are susceptible to OOM kills. I've proposed a patch upstream to fix this which has been acked by Nick Piggin.

Once I confirm that the CIFS maintainer will take in the patch, I'll post it for RHEL6. I think we want this in the next beta if at all possible.

Comment 2 Aristeu Rozanski 2010-06-03 19:58:21 UTC

Patch(es) available on kernel-2.6.32-32.el6

Comment 5 yanfu,wang 2010-08-05 02:40:23 UTC

I run fsstress on cifs filesystem for a few hours and no OOM kills error occurs on.
# uname -a
Linux dell-pem605-01.rhts.eng.bos.redhat.com 2.6.32-54.el6.x86_64 #1 SMP Wed Jul 28 00:06:54 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
# rpm -qa|grep samba
samba-winbind-clients-3.5.4-65.el6.x86_64
samba-common-3.5.4-65.el6.x86_64
samba-client-3.5.4-65.el6.x86_64
# rpm -qa|grep nfs-utils
nfs-utils-1.2.2-5.el6.x86_64
nfs-utils-lib-1.1.5-1.el6.x86_64
# cat /proc/mounts 
//localhost/public/ /cifs cifs rw,mand,relatime,unc=\\localhost\public,username=root,uid=0,noforceuid,gid=0,noforcegid,addr=0000:0000:0000:0000:0000:0000:0000:0001,posixpaths,acl,rsize=16384,wsize=57344 0 0
# nohup ./fsstress -d /cifs  -l 0 -n 1000 -p 4 -r &

Comment 6 releng-rhel@redhat.com 2010-11-11 15:53:37 UTC

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.