Bug 175778

Summary: Accessing automounted directories can cause a process to hang forever
Product: Red Hat Enterprise Linux 4 Reporter: Jeff Moyer <jmoyer>
Component: kernelAssignee: Jeff Moyer <jmoyer>
Status: CLOSED ERRATA QA Contact: Brock Organ <borgan>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: aspanke
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: RHSA-2006-0575 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-08-10 21:45:52 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: 181409    
Attachments:
Description Flags
fix a race at the tail end of expire none

Description Jeff Moyer 2005-12-14 21:09:57 UTC 
+++ This bug was initially created as a clone of Bug #160600 +++

Description of problem:
Automount can cause a program to hang when accessing a directory that is being
expired.

Version-Release number of selected component (if applicable):
autofs-4.1.3-130
kernel-2.4.21-32

How reproducible:
No reproducer available.

Steps to Reproduce:
1.
2.
3.
  
Actual results:
If the race is triggered, the process performing the lookup will hang
indefinitely.  You will be able to interrupt it, though.

Expected results:


Additional info:
This issue was reported upstream, and is resolved with the attached patch.  The
race is pretty clear, once you understand the code path, and the fix looks
straight forward and correct.

-- Additional comment from jmoyer on 2005-06-15 19:54 EST --
Created an attachment (id=115514)
Fix a race in the tail end of an expire event, causing a process to hang forever.


-- Additional comment from jmoyer on 2005-06-15 19:55 EST --
Posting patch to internal mailing list for review.
Comment 1 Jeff Moyer 2005-12-14 21:09:57 UTC 
Created attachment 122247 [details]
fix a race at the tail end of expire
Comment 2 Jeff Moyer 2006-01-04 18:02:59 UTC 
Posted internally for review on 12/14/2005.
Comment 7 Jason Baron 2006-04-11 15:42:13 UTC 
committed in stream U4 build 34.16. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/
Comment 12 Red Hat Bugzilla 2006-08-10 21:45:52 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-2006-0575.html