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Bug 157295 - Connecting to an existing lockspace breaks reference count
Summary: Connecting to an existing lockspace breaks reference count
Alias: None
Product: Red Hat Cluster Suite
Classification: Retired
Component: dlm
Version: 4
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: David Teigland
QA Contact: Cluster QE
: 143449 (view as bug list)
Depends On:
TreeView+ depends on / blocked
Reported: 2005-05-10 10:25 UTC by Christine Caulfield
Modified: 2009-04-16 20:30 UTC (History)
1 user (show)

Fixed In Version: RHBA-2005-735
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2005-10-07 16:54:34 UTC

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2005:735 normal SHIPPED_LIVE dlm-kernel bug fix update 2005-10-07 04:00:00 UTC

Description Christine Caulfield 2005-05-10 10:25:05 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050504 Fedora/1.0.3-4 Firefox/1.0.3

Description of problem:
If an application opens an already existing lockspace, the DLM ref count is still incremented. This means that when all lockspaces are removed the DLM does not tidy up. Any attempt to rmmod the dlm module results in a kernel panic.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. start clvmd
2. killall -9 clvmd (this leaves the lockspace in place)
3. clvmd
4. killall clvmd (this closes the lockspace)
5. rmmod dlm


Actual Results:  "grep dlm /proc/slabinfo" shows the DLM slabs still in place, "ps -ef|grep dlm" shows the DLM processes still running.
modprobe dlm will panic the kernel as it tries to recreate the slab.

Expected Results:  Something much less spectacular!
Deleting the last lockspace should cause the DLM to tidy up.

Additional info:

This patch fixes:

--- lockspace.c 26 Mar 2005 04:43:51 -0000
+++ lockspace.c 10 May 2005 09:55:50 -0000
@@ -415,12 +415,18 @@ int dlm_new_lockspace(char *name, int na

        error = init_internal();
-       if (error)
+       if (error) {
+               up(&dlmstate_lock);
                goto out;
+       }
        error = new_lockspace(name, namelen, lockspace, flags);
- out:  
+       if (error)
+               dlm_release();
+ out:
        return error;

Comment 1 Christine Caulfield 2005-05-10 13:21:36 UTC
*** Bug 143449 has been marked as a duplicate of this bug. ***

Comment 2 Christine Caulfield 2005-06-28 13:11:38 UTC
Fixed on RHEL4 branch so should turn up in U2

Comment 4 Red Hat Bugzilla 2005-10-07 16:54:34 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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