Bug 171637 - lsof -b still blocks on gethostbyname causing slow force unmount; use -bn instead
Summary: lsof -b still blocks on gethostbyname causing slow force unmount; use -bn ins...
Alias: None
Product: Red Hat Cluster Suite
Classification: Retired
Component: clumanager
Version: 3
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Lon Hohberger
QA Contact: Cluster QE
Depends On:
Blocks: 172895
TreeView+ depends on / blocked
Reported: 2005-10-24 16:29 UTC by Lon Hohberger
Modified: 2009-04-16 20:18 UTC (History)
2 users (show)

Clone Of:
Last Closed: 2006-03-27 18:05:29 UTC

Attachments (Terms of Use)
Fixes behavior (574 bytes, patch)
2005-11-10 21:55 UTC, Lon Hohberger
no flags Details | Diff

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2006:0196 normal SHIPPED_LIVE clumanager bug fix update 2006-03-27 05:00:00 UTC

Description Lon Hohberger 2005-10-24 16:29:21 UTC
Description of problem:

If clumanager has a service configured with force unmount support and that
service is stopped, the stop phase can take a VERY long time to complete if lsof
is used and DNS is cut off.

The solution is to add "-n" to the lsof option string so that DNS is not used.

Comment 1 Lon Hohberger 2005-11-10 21:55:33 UTC
Created attachment 120910 [details]
Fixes behavior

Comment 2 Lon Hohberger 2005-11-10 22:04:07 UTC
Setting to modified.

Comment 3 Lon Hohberger 2005-11-11 20:58:34 UTC
A new *TEST* package build with several bugfixes (fixes bugzillas: 171637 172735
172893 172894 ) is available.  Gulm-bridge support has been disabled in this
release to prevent having to install with the "--nodeps" option:


Let us know if this works for you.

Comment 4 Lon Hohberger 2005-12-14 21:09:49 UTC
This is not critical for testing, but worth noting:

1.  Examine /usr/lib/clumanager/services/svclib_filesystem and
take a note of the lsof command in there, which calls "lsof -b".

2.  Temporarily disable name resolution one way is to use:
	iptables -A OUTPUT -p udp -m udp --dport 53 -m state \
		 --state NEW -j DROP

3.  Run lsof -b; it should pause at points (or sometimes hang for a
long time).

4.  Run lsof -bn; it should not hang or noticeably pause.

Comment 7 Red Hat Bugzilla 2006-03-27 18:05:29 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.


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