Bug 476515

Summary: RHEL4: bind-9.2.4-30.el4 and too many open files
Product: Red Hat Enterprise Linux 4 Reporter: Tomas Smetana <tsmetana>
Component: bindAssignee: Adam Tkac <atkac>
Status: CLOSED ERRATA QA Contact: Martin Cermak <mcermak>
Severity: medium Docs Contact:
Priority: urgent    
Version: 4.6CC: jplans, lscalabr, mmahut, mpoole, mprpic, mschick, ovasik, pasteur, riek, rryder, rvokal, tao
Target Milestone: rcKeywords: ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
* when the number of processed queries in BIND was sufficiently high, the following error message was logged: "internal_accept: fcntl() failed: Too many open files". With this update, timeout queries are aborted in order to reduce the number of open UDP sockets, and when the accept() function returns an EMFILE error value, that situation is now handled gracefully, thus resolving the issue.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2011-02-16 14:05:09 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: 484874    
Attachments:
Description Flags
Partial patch
none
Improved patch none

Description Tomas Smetana 2008-12-15 12:27:44 UTC 
Description of problem:
The following errors appear in the logs:

 Sep 10 10:05:01.787 socket.c:1875: unexpected error:
 Sep 10 10:05:01.787 internal_accept: fcntl() failed: Too many open files
 Sep 10 10:10:01.531 socket.c:1875: unexpected error:
 Sep 10 10:10:01.531 internal_accept: fcntl() failed: Too many open files

Version-Release number of selected component (if applicable):
bind-9.2.4-30.el4

How reproducible:
Under heavier load

Steps to Reproduce:
1. Start bind
2. If the queries frequency is sufficiently high, the error logs start to appear
  
Actual results:
Error messages in the log

Expected results:
No error messages

Additional info:
The problem looks to be caused by the patches for CVE-2008-1447.  There exists related bug for RHEL-5 (https://bugzilla.redhat.com/show_bug.cgi?id=457036) and partial fix was included in bind 9.3.5-P2 I think.
Comment 1 Tomas Smetana 2008-12-15 12:31:08 UTC 
Created attachment 326939 [details]
Partial patch

This is a partial fix that helps to get rid of the errors in some cases.
Comment 11 Adam Tkac 2009-02-10 10:51:39 UTC 
*** Bug 481824 has been marked as a duplicate of this bug. ***
Comment 15 Adam Tkac 2009-02-10 14:13:50 UTC 
Created attachment 331426 [details]
Improved patch
Comment 22 Martin Cermak 2010-06-07 08:41:15 UTC 
Patch bind92-rh476515.patch is included as patch 25. According to [1] this can not be easilly tested inhouse, but there is a good feedback from the costomer [2].

=> SanityOnly

[1] https://bugzilla.redhat.com/show_bug.cgi?id=476515#c12
[2] https://bugzilla.redhat.com/show_bug.cgi?id=476515#c4
Comment 23 Martin Prpič 2010-06-11 12:32:30 UTC 
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.

New Contents:
* when the number of processed queries in BIND was sufficiently high, the following error message was logged: "internal_accept: fcntl() failed: Too many open files". With this update, timeout queries are aborted in order to reduce the number of open UDP sockets, and when the accept() function returns an EMFILE error value, that situation is now handled gracefully, thus resolving the issue.
Comment 25 errata-xmlrpc 2011-02-16 14:05:09 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/RHBA-2011-0223.html