Bug 177691 – negative dentry caching causes long delay when dentry becomes valid

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Bug 177691 - negative dentry caching causes long delay when dentry becomes valid

Summary:	negative dentry caching causes long delay when dentry becomes valid

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 3
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	3.0
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Jeff Moyer
QA Contact:	Brian Brock
Docs Contact:

URL:
Whiteboard:
Keywords:	Regression

Depends On:
Blocks:	168426
	Show dependency tree / graph

Reported:	2006-01-12 17:09 EST by Tom Coughlan
Modified:	2007-11-30 17:07 EST (History)
CC List:	2 users (show)

See Also:
Fixed In Version:	RHSA-2006-0144
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2006-03-15 11:59:19 EST
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-2006:0144	qe-ready	SHIPPED_LIVE	Moderate: Updated kernel packages available for Red Hat Enterprise Linux 3 Update 7	2006-03-15 00:00:00 EST

Groups: None (edit)

Description Tom Coughlan 2006-01-12 17:09:15 EST

This is the same problem on RHEL 3 as the following RHEL 4 BZ:

175687 â autofs doesn't attempt to remount failed mount points

Negative dentrys are created when someone references a non-existent dentry. The
problem is that these persist for 60 seconds, so access to the dentry is blocked
even if it becomes valid during this time. This is a regression in U3/U7. The
proposed fix is to simply remove negative dentry caching from U3/U7. We plan to
consider adding it back in in a later update. 

ACKed on rhkernel-list for U3 and U7. Accepted for inclusion in same by PM.

Comment 1 Jeff Moyer 2006-01-13 14:05:00 EST


*** This bug has been marked as a duplicate of 177573 ***

Comment 3 Ernie Petrides 2006-01-20 18:37:48 EST

A fix for this problem has just been committed to the RHEL3 U7
patch pool this evening (in kernel version 2.4.21-39.EL).

Comment 4 Red Hat Bugzilla 2006-03-15 11:59:19 EST

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 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-2006-0144.html

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