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Bug 1292054 - tmpfile leak in mysql resource agent
Summary: tmpfile leak in mysql resource agent
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: resource-agents
Version: 6.8
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Oyvind Albrigtsen
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On: 1263348
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-12-16 10:59 UTC by Oyvind Albrigtsen
Modified: 2021-03-11 14:26 UTC (History)
11 users (show)

Fixed In Version: resource-agents-3.9.5-28.el6
Doc Type: Bug Fix
Doc Text:
Clone Of: 1263348
Environment:
Last Closed: 2016-05-10 19:15:42 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2016:0735 0 normal SHIPPED_LIVE resource-agents bug fix and enhancement update 2016-05-10 22:28:24 UTC

Description Oyvind Albrigtsen 2015-12-16 10:59:55 UTC 
+++ This bug was initially created as a clone of Bug #1263348 +++

Description of problem:
The mysql resource agent leaks the check_slave... tmpfile and thus floods the /var/run/resource-agents directory with check_slave.* files which are not cleaned up, eventually leading to a filled partition or inode shortage.

Version-Release number of selected component (if applicable):
bash-4.2.46-12.el7.x86_64 (CentOS 7.1.1503)
resource-agents-3.9.5-40.el7_1.6.x86_64 (CentOS 7.1.1503)

How reproducible:
always

Steps to Reproduce:
1. Setup mysql Master/Slave Pacemaker cluster 
2. Look at the /var/run/resource-agents directory
3.

Actual results:
Hundreds and thousands of left over check_slave.* files in /var/run/resource-agents

Expected results:
None to a few check_slave.* files in /var/run/resource-agents

Additional info:
I did some debugging and the problem seems to boil down to a strings behaviour in /usr/lib/ocf/resource.d/heartbeat/mysql:

1. The function check_slave() creates the file through the get_slave_info() function in line 378
2. Later on the file should be deleted. Actually the execution goes through line 504 which should delete the file using rm -f $tmpfile
3. Debugging shows that the $tmpfile variable is empty when the rm -f $tmpfile happens. The $tmpfile variable seems to be scoped to the get_slave_info() function, though there is no 'local' declaration in the function.

--- Additional comment from Fabio Massimo Di Nitto on 2015-09-15 19:33:31 CEST ---

Looking at the code, there are tons of conditions inside the agent that can lead to file temporary file leaks beside the normal runtime monitoring issue.

I have never used mysql is master/slave mode (where this code path is leaking). Can you please share your configuration so i can set it up easily to verify any fix?

Thanks

--- Additional comment from Frank Enderle on 2015-10-02 18:40:35 CEST ---

I'm currently unable to produce a test case. I will try to find the time in the next week, so please do not autoclose this bug.

--- Additional comment from Oyvind Albrigtsen on 2015-12-16 11:18:21 CET ---

OCF_CHECK_LEVEL=10 is required to reproduce the issue:
# pcs resource op add MySQL monitor interval=15s OCF_CHECK_LEVEL=10

I tested and verified that the following patch solves the issue:
https://github.com/ClusterLabs/resource-agents/pull/722
Comment 2 Oyvind Albrigtsen 2015-12-16 11:01:38 UTC 
Tested and verified that the patch is working as expected on RHEL6 as well.
Comment 3 Oyvind Albrigtsen 2015-12-21 12:23:34 UTC 
Create MySQL service with pcs and run the following command to be able to reproduce the issue:
# pcs resource op add MySQL monitor interval=60s OCF_CHECK_LEVEL=10

Before:
New /var/run/resource-agents/check_slave.mysql.XXXXXX created on slave-node every minute (or other interval you set it to).

After:
/var/run/resource-agents/check_slave.mysql.XXXXXX files are deleted after being used by the resource agent.
Comment 4 Oyvind Albrigtsen 2015-12-24 12:52:05 UTC 
Setup:
# pcs resource create MySQL mysql
# pcs resource master MySQL
# pcs resource op add MySQL monitor interval=15s OCF_CHECK_LEVEL=10


Run on the slave node.

Before:
# rpm -q resource-agents
resource-agents-3.9.5-24.el6_7.1.x86_64
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f

Wait at least 15 seconds.
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f
/var/run/resource-agents/check_slave.MySQL.uxRvQo


After:
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f
/var/run/resource-agents/check_slave.MySQL.uxRvQo

Wait at least 15 seconds.
# ls /var/run/resource-agents/check_slave.*
/var/run/resource-agents/check_slave.MySQL.uCeh9f
/var/run/resource-agents/check_slave.MySQL.uxRvQo

The same number of files (from before the patch still exist, but will be removed on reboot).
Comment 8 errata-xmlrpc 2016-05-10 19:15:42 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-0735.html
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