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Bug 1405205

Summary:	crm_report should not collect /var/log/lastlog (or have some safety measures included)
Product:	Red Hat Enterprise Linux 6	Reporter:	Jaroslav Kortus <jkortus>
Component:	pacemaker	Assignee:	Ken Gaillot <kgaillot>
Status:	CLOSED ERRATA	QA Contact:	cluster-qe <cluster-qe>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6.9	CC:	abeekhof, cluster-maint, mnovacek
Target Milestone:	rc
Target Release:	6.9
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	pacemaker-1.1.15-4.el6	Doc Type:	No Doc Update
Doc Text:	undefined	Story Points:	---
Clone Of:
Clones:	1405635 (view as bug list)		Environment:
Last Closed:	2017-03-21 09:52:44 UTC	Type:	Bug
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:	1405635

Description Jaroslav Kortus 2016-12-15 21:02:20 UTC

Description of problem:
crm_report collects /var/log/lastlog file (or at least is looking for patterns in there for some reason).

Usually that is harmless, because the file is small. If it gets large, it creates a problem for grep used by crm_report, as it scans through that binary file and buffers everything up to a newline char.

You can quite easily create a file that is very large and grep will try to buffer it. Then it runs out of RAM and gets killed.

Easy way to create a large /var/log/lastlog is:
useradd -b /mnt/brawl -m -U -c "quota-sanity user" -u 10000000 quota-user-kPRAaCKm

Even though these circumstances are not exactly the common ones, we do crash on a file that most likely does not contain useful info. Can you please add a check there or just remove the grepping through it completely?

Ideally no part of crm_report should be able to eat up all memory :).

Version-Release number of selected component (if applicable):
pacemaker-cli-1.1.15-3.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. on any cluster node: useradd -b /mnt/brawl -m -U -c "quota-sanity user" -u 10000000 quota-user-kPRAaCKm
2. run crm_report that collects info from all nodes
3.

Actual results:
grep crashes (signal 6) on the affected node, maybe some files will be missing in the report.

Expected results:
* ideally skip /var/log/lastlog collection
* crm_report being more cautious on binary files with grep (doing a size check would be neat)

Additional info:

Comment 5 Ken Gaillot 2016-12-16 21:58:07 UTC

The problem is that crm_report dynamically detects what system logs are used for the cluster by grepping for a particular pattern in (up to) all files in /var/log.

It's already on the long-term plan to convert crm_report from a shell script to python, to make the file handling much more efficient.

But for 6.9 timeframe, I can make sure "file" returns "text" or "compressed" before doing the grep. That will at least skip lastlog, wtmp, etc.

Comment 6 Ken Gaillot 2016-12-19 15:37:02 UTC

Fixed by upstream commit 083488ce

Comment 8 Andrew Beekhof 2017-01-09 03:02:29 UTC

(In reply to Ken Gaillot from comment #5)
> The problem is that crm_report dynamically detects what system logs are used
> for the cluster by grepping for a particular pattern in (up to) all files in
> /var/log.
> 
> It's already on the long-term plan to convert crm_report from a shell script
> to python, to make the file handling much more efficient.

If you say so, but isn't all that turned off when it gets called by sosreport?

> 
> But for 6.9 timeframe, I can make sure "file" returns "text" or "compressed"
> before doing the grep. That will at least skip lastlog, wtmp, etc.

Comment 9 Ken Gaillot 2017-01-09 18:04:09 UTC

(In reply to Andrew Beekhof from comment #8)
> (In reply to Ken Gaillot from comment #5)
> > The problem is that crm_report dynamically detects what system logs are used
> > for the cluster by grepping for a particular pattern in (up to) all files in
> > /var/log.
> > 
> > It's already on the long-term plan to convert crm_report from a shell script
> > to python, to make the file handling much more efficient.
> 
> If you say so, but isn't all that turned off when it gets called by
> sosreport?

You're right -- this will only matter when called directly by the user (as crm_report or "pcs cluster report"). It will also be turned off if the user calls crm_report with -M. But the fix is simple, and users sometimes do call it directly.

Comment 10 michal novacek 2017-01-13 10:41:55 UTC

I have verified that it is possible to create report with /var/log/lastlog
being ~300% of ram+swap with pacemaker-1.1.15-4.

[root@virt-009 ~]# tail -f /etc/passwd
...
quota-user:x:10000000:502:quota-sanity user:/home/brawl/quota-user:/bin/bash

[root@virt-009 ~]# ls -l /var/log/lastlog 
-rw-r--r--. 1 root root 2920000292 Jan 12 11:36 /var/log/lastlog

cluster setup like this (1) (2)

[root@virt-009 ~]# pcs cluster report /tmp/le-report
Error: /tmp/le-report.tar.bz2 already exists, use --force to overwrite

[root@virt-009 ~]# pcs cluster report /tmp/le-report2
virt-009:   Calculated node list: virt-061 virt-057 virt-008 virt-062 virt-067 virt-060 virt-009 virt-018 virt-059 virt-006 virt-013 virt-007 virt-056 virt-016 virt-058 virt-014 
virt-009:   Collecting data from virt-061 virt-057 virt-008 virt-062 virt-067 virt-060 virt-009 virt-018 virt-059 virt-006 virt-013 virt-007 virt-056 virt-016 virt-058 virt-014  (01/11/17 14:10:00 to 01/12/17 14:10:34)
virt-009:   Including all logs after line 29268 from /var/log/cluster/corosync.log-20170112.gz
...

[root@virt-009 ~]# echo $?
0
[root@virt-009 ~]# ls -l /tmp/le-report.tar.bz2
-rw-r--r--. 1 root root 11095127 Jan 12 11:46 /tmp/le-report.tar.bz2

-----

> (1) pcs cluster setup
[root@virt-009 ~]# pcs status
Cluster name: STSRHTS23364
Stack: cman
Current DC: virt-006 (version 1.1.15-3.el6-e174ec8) - partition with quorum
Last updated: Thu Jan 12 11:41:04 2017          Last change: Thu Jan 12 11:05:24 2017 by root via crm_attribute on virt-009

16 nodes and 48 resources configured

Online: [ virt-006 virt-007 virt-008 virt-009 virt-013 virt-014 virt-016 virt-018 virt-056 virt-057 virt-058 virt-059 virt-060 virt-061 virt-062 virt-067 ]

Full list of resources:

 fence-virt-006 (stonith:fence_xvm):    Started virt-006
 fence-virt-007 (stonith:fence_xvm):    Started virt-007
 fence-virt-008 (stonith:fence_xvm):    Started virt-008
 fence-virt-009 (stonith:fence_xvm):    Started virt-009
 fence-virt-013 (stonith:fence_xvm):    Started virt-013
 fence-virt-014 (stonith:fence_xvm):    Started virt-014
 fence-virt-016 (stonith:fence_xvm):    Started virt-016
 fence-virt-018 (stonith:fence_xvm):    Started virt-018
 fence-virt-056 (stonith:fence_xvm):    Started virt-056
 fence-virt-057 (stonith:fence_xvm):    Started virt-057
 fence-virt-058 (stonith:fence_xvm):    Started virt-058
 fence-virt-059 (stonith:fence_xvm):    Started virt-059
 fence-virt-060 (stonith:fence_xvm):    Started virt-060
 fence-virt-061 (stonith:fence_xvm):    Started virt-061
 fence-virt-062 (stonith:fence_xvm):    Started virt-062
 fence-virt-067 (stonith:fence_xvm):    Started virt-067
 Clone Set: clvmd-clone-clone [clvmd-clone]
     Started: [ virt-006 virt-007 virt-008 virt-009 virt-013 virt-014 virt-016 virt-018 virt-056 virt-057 virt-058 virt-059 virt-060 virt-061 virt-062 virt-067 ]
 Clone Set: dlm-clone-clone [dlm-clone]
     Started: [ virt-006 virt-007 virt-008 virt-009 virt-013 virt-014 virt-016 virt-018 virt-056 virt-057 virt-058 virt-059 virt-060 virt-061 virt-062 virt-067 ]

Daemon Status:
  cman: active/disabled
  corosync: active/disabled
  pacemaker: active/disabled
  pcsd: active/enabled

> (2) pcs config
[root@virt-009 ~]# pcs config
Cluster Name: STSRHTS23364
Corosync Nodes:
 virt-006 virt-007 virt-008 virt-009 virt-013 virt-014 virt-016 virt-018 virt-056 virt-057 virt-058 virt-059 virt-060 virt-061 virt-062 virt-067
Pacemaker Nodes:
 virt-006 virt-007 virt-008 virt-009 virt-013 virt-014 virt-016 virt-018 virt-056 virt-057 virt-058 virt-059 virt-060 virt-061 virt-062 virt-067

Resources:
 Clone: clvmd-clone-clone
  Resource: clvmd-clone (class=ocf provider=heartbeat type=Dummy)
   Operations: start interval=0s timeout=20 (clvmd-clone-start-interval-0s)
               stop interval=0s timeout=20 (clvmd-clone-stop-interval-0s)
               monitor interval=10 timeout=20 (clvmd-clone-monitor-interval-10)
 Clone: dlm-clone-clone
  Resource: dlm-clone (class=ocf provider=heartbeat type=Dummy)
   Operations: start interval=0s timeout=20 (dlm-clone-start-interval-0s)
               stop interval=0s timeout=20 (dlm-clone-stop-interval-0s)
               monitor interval=10 timeout=20 (dlm-clone-monitor-interval-10)

Stonith Devices:
 Resource: fence-virt-006 (class=stonith type=fence_xvm)
  Attributes: delay=5 pcmk_host_check=static-list pcmk_host_list=virt-006 pcmk_host_map=virt-006:virt-006.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-006-monitor-interval-60s)
 Resource: fence-virt-007 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-007 pcmk_host_map=virt-007:virt-007.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-007-monitor-interval-60s)
 Resource: fence-virt-008 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-008 pcmk_host_map=virt-008:virt-008.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-008-monitor-interval-60s)
 Resource: fence-virt-009 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-009 pcmk_host_map=virt-009:virt-009.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-009-monitor-interval-60s)
 Resource: fence-virt-013 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-013 pcmk_host_map=virt-013:virt-013.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-013-monitor-interval-60s)
 Resource: fence-virt-014 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-014 pcmk_host_map=virt-014:virt-014.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-014-monitor-interval-60s)
 Resource: fence-virt-016 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-016 pcmk_host_map=virt-016:virt-016.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-016-monitor-interval-60s)
 Resource: fence-virt-018 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-018 pcmk_host_map=virt-018:virt-018.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-018-monitor-interval-60s)
 Resource: fence-virt-056 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-056 pcmk_host_map=virt-056:virt-056.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-056-monitor-interval-60s)
 Resource: fence-virt-057 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-057 pcmk_host_map=virt-057:virt-057.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-057-monitor-interval-60s)
 Resource: fence-virt-058 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-058 pcmk_host_map=virt-058:virt-058.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-058-monitor-interval-60s)
 Resource: fence-virt-059 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-059 pcmk_host_map=virt-059:virt-059.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-059-monitor-interval-60s)
 Resource: fence-virt-060 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-060 pcmk_host_map=virt-060:virt-060.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-060-monitor-interval-60s)
 Resource: fence-virt-061 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-061 pcmk_host_map=virt-061:virt-061.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-061-monitor-interval-60s)
 Resource: fence-virt-062 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-062 pcmk_host_map=virt-062:virt-062.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-062-monitor-interval-60s)
 Resource: fence-virt-067 (class=stonith type=fence_xvm)
  Attributes: pcmk_host_check=static-list pcmk_host_list=virt-067 pcmk_host_map=virt-067:virt-067.cluster-qe.lab.eng.brq.redhat.com
  Operations: monitor interval=60s (fence-virt-067-monitor-interval-60s)
Fencing Levels:

Location Constraints:
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:

Alerts:
 No alerts defined

Resources Defaults:
 No defaults set
Operations Defaults:
 No defaults set

Cluster Properties:
 cluster-infrastructure: cman
 dc-version: 1.1.15-3.el6-e174ec8
 have-watchdog: false
Node Attributes:
 virt-009: a=a

Comment 12 errata-xmlrpc 2017-03-21 09:52:44 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/RHEA-2017-0629.html