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Bug 177691

Summary: negative dentry caching causes long delay when dentry becomes valid
Product: Red Hat Enterprise Linux 3 Reporter: Tom Coughlan <coughlan>
Component: kernelAssignee: Jeff Moyer <jmoyer>
Status: CLOSED ERRATA QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 3.0CC: lwang, petrides
Target Milestone: ---Keywords: Regression
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: RHSA-2006-0144 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-03-15 16:59:19 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:    
Bug Blocks: 168426    

Description Tom Coughlan 2006-01-12 22:09:15 UTC 
This is the same problem on RHEL 3 as the following RHEL 4 BZ:

175687 รข 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 19:05:00 UTC 

*** This bug has been marked as a duplicate of 177573 ***
Comment 3 Ernie Petrides 2006-01-20 23:37:48 UTC 
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 16:59:19 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 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