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Bug 632399

Summary: Misleading message from fs/nfs/file.c:do_vfs_lock()
Product: Red Hat Enterprise Linux 5 Reporter: Fabio Olive Leite <fleite>
Component: kernelAssignee: Jeff Layton <jlayton>
Status: CLOSED ERRATA QA Contact: Petr Beňas <pbenas>
Severity: high Docs Contact:
Priority: high    
Version: 5.5CC: bfields, eguan, jlayton, pbenas, pstehlik, qcai, steved
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: 2011-07-21 10:08:51 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:
Attachments:
Description Flags
Simple patch to remove the message none

Description Fabio Olive Leite 2010-09-09 20:21:35 UTC 
Created attachment 446368 [details]
Simple patch to remove the message

Description of problem:

When an NFS volume is mounted with -onolock, any interrupted blocked locking call generates this message:

kernel: do_vfs_lock: VFS is out of sync with lock manager!

The message is incorrect, since the lock manager will not be used on mounts with -onolock, and is both annoying and scary on the logs.

It was recently fixed upstream: http://marc.info/?t=128383914000003&r=1&w=2

Version-Release number of selected component (if applicable):

kernel-2.6.18-164.2.1.el5 on the test box where it was reproduced, but pretty much any RHEL-5 kernel is affected.

How reproducible:

Always.

Steps to Reproduce:
1. mount -onolock server:/volume /mnt
2. flock /mnt/file bash [ locks the file and spawns a new shell ]
3. flock -w 1 /mnt/file bash [ repeat ad nauseam, each gets a printk ]

The "flock -w 1" is a case where it alarms out of the flock call. One can also run it without a timeout and ^C out of it, and it also gets a printk.

Actual results:

Incorrect message is displayed on the console and sent to the logs.

Expected results:

No incorrect messages.
Comment 4 Eric Sammons 2010-09-26 19:01:11 UTC 
=== In Red Hat Customer Portal Case 00320163 ===
--- Comment by Sammons, Eric on 9/26/2010 3:00 PM ---

Customer has also expressed concerns of a possible DoS scenario here and would like to request this released as Errata.
Comment 6 Jeff Layton 2010-10-05 11:51:52 UTC 
I've incorporated this patch into my test kernels here:

    http://people.redhat.com/jlayton/

...if you have a non-critical place to test them, please do so and report the results.
Comment 8 RHEL Program Management 2011-02-01 16:57:33 UTC 
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 11 Jarod Wilson 2011-02-21 20:56:27 UTC 
in kernel-2.6.18-245.el5
You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5

Detailed testing feedback is always welcomed.
Comment 14 Petr Beňas 2011-02-22 10:05:20 UTC 
Reproduced in 2.6.18-244.el5 and verified in 2.6.18-245.el5.
Comment 16 errata-xmlrpc 2011-07-21 10:08:51 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-2011-1065.html