Bug 114960

Summary:	nfs layer livelocks after after using up all of the kmap space
Product:	Red Hat Enterprise Linux 2.1	Reporter:	Jason Baron <jbaron>
Component:	kernel	Assignee:	Steve Dickson <steved>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	high	Docs Contact:
Priority:	medium
Version:	2.1	CC:	aander07, anderson, dhoward, fhirtz, knoel, petrides, riel, steved, tao
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2004-08-18 14:25:16 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:	58216, 89453
Bug Blocks:	107565

Description Jason Baron 2004-02-04 20:54:26 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.2)
Gecko/20031013

Description of problem:
Some of the rpc layer calls kmap in the the same thread. This can lead
to livelock when there are lots of threads and i/o. ie high load. This
bug is being created to track a number of places where this bug has
been hit. related bz #89453, bz #114209, and bz #58216. Issue tracker
is: it #33097.

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


How reproducible:
Didn't try


Additional info:

Comment 1 Jason Baron 2004-02-04 20:58:44 UTC

ABI issues might be a pain on this one but i'm adding to the blocker
list, since this is a serious and prevalent issue.

Comment 2 Jason Baron 2004-02-12 20:15:22 UTC

we can use this 'tracker' bug to mark progress. Dave Anderson is
currently building a kernel through beehive, that we can give out to
test to partners.

Comment 3 Dave Anderson 2004-02-12 23:02:08 UTC

Binary RPMs containing test kernels can found in:

  http://people.redhat.com/anderson/.nfs_kmap_nonblock

Comment 5 Jason Baron 2004-07-09 20:19:26 UTC

ok, we've fixed this by adding the nfs module parameters, which should
be set as: nfs_max_request_hard=60 nfs_max_request_soft=30. Fix is in U5.

Comment 6 Jason Baron 2004-07-09 20:21:05 UTC

*** Bug 114209 has been marked as a duplicate of this bug. ***

Comment 7 John Flanagan 2004-08-18 14:25:16 UTC

An errata 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 the 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-2004-437.html