Memory leak

[Arno Lehmann]

Sir... tststs :-)

Stanley Hopcroft wrote:

> Dear Sir,
> 
> I am writing to thank you for your letter and say,
>>
>>In the mailing list, I found this reported as a known bug concerning 
>>embedded perl, and in December Andreas wrote that one ugly leak was 
>>fixed...should be in b2, shouldn't it?
> 
> 
> There is an unfixed known bug using embedded Perl of this nature (see 
> perldoc p1.pl).
> 
> You may have found a new leak.

Possible...

>>Now, I'm wondering if this is a new bug, or a known issue - I couldn't 
>>find anything in the documentation or release notes... on the other 
>>hand, this should be obvious to others.
>>
>>My configuration: Linux Kernel  2.6.8-24.13-default (SuSE 9.2), nagios 
>>2.0b2 just as downloaded, compiled without (to my knowledge...) perl 
>>support.
>>
> 
> 
> I think that something like this
> 
> tsitc> nm 
> <path to build directory of Nag>/base/nagios 
> | grep perl
> 0806c29c T deinit_embedded_perl
> 0806c1dc T init_embedded_perl
> 080a4068 d my_perl
>          U perl_alloc
>          U perl_construct
>          U perl_destruct
>          U perl_free
>          U perl_parse
>          U perl_run
> 080a406c D use_embedded_perl

Ah, great... not being a programmer nm was not an idea I had.

Well, I tried it, and after seeing that the instaled binary was stripped 
I checked the one in the build tree and found it only has the init and 
deinit functions defined.

So, perl is not included, but the memory leak is???

> 
> will tell you if you have embedded Perl (if you see D use_embedded_perl, 
> you have Perl compiled into your Nag).

See above: No, as I thought.

>>Everything else works as expected.
>>
>>Unfortunately, I can't determine how the memory gets "eaten" - ps 
>>doesn't tell me about any processes with huge RSSes. In fact, I can't be 
>>sure that Nagios itself leaks that memory, but it happens if and only 
>>when Nagios is running.
> 
> 
> top does on this BSD host eg
...
> Likewise you could use check_procs from the standard plugin set to 
> monitor vsz.

Well, I tried top as well as ps and the memory isn't used by any process 
as far as I can determine it. Logged output from ps:
>              total       used       free     shared    buffers     cached
> Mem:        515636     512884       2752          0       1800       5976
> -/+ buffers/cache:     505108      10528
> Swap:      2120540      47852    2072688
>   PID USER      RSS    SZ CMD
>  4039 ntp      5228  1308 /usr/sbin/ntpd -p /var/lib/ntp/var/run/ntp/ntpd.pid -u ntp -i /var/lib/ntp
> 20740 wwwrun   2124  7678 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf -DSSL
> 20294 wwwrun   2100  7657 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf -DSSL
>  4279 root     1724  2675 /usr/sbin/smbd -D -s /etc/samba/smb.conf
>  4286 root     1724  2683 /usr/sbin/smbd -D -s /etc/samba/smb.conf
> 26755 cyrus    1704  7431 imapd
> 26757 cyrus    1704  7461 imapd
> 26126 cyrus    1700  7421 imapd
> 26754 cyrus    1700  7425 imapd
> 26756 cyrus    1700  7411 imapd
>  8176 cyrus    1692  7411 imapd
>  8177 cyrus    1692  7421 imapd
> 20707 nagios   1596  2841 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
>  8635 nagios   1572  2842 /usr/local/nagios/bin/nagios -d /usr/local/nagios/etc/nagios.cfg
>  4425 root     1568  7253 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf -DSSL
>  4450 root     1544  1200 /usr/bin/fetchmail -d 912 -a -f /etc/fetchmailrc -L /var/log/fetchmail
>  8614 postfix  1528  1550 smtpd -n smtp -t inet -u -s 2
>  4364 postfix  1520  1400 qmgr -l -t fifo -u
>  7831 postfix  1504  1391 pickup -l -t fifo -u
>  8625 cyrus    1228  6983 imapd
>  8634 root     1168  1221 ps -eopid,user,rss,sz,cmd --sort=-rss
>  7932 man      1124  1226 /usr/bin/mandb -q -s
> 23535 root     1092  1402 -bash
>  4349 root     1088  1069 /usr/lib/postfix/master
>  3632 root     1084  1701 /usr/sbin/saslauthd -a pam
>  4440 root     1060  1161 /usr/sbin/xinetd
>  4740 root     1044  1210 login -- root
>  4473 root     1012  1086 /sbin/mingetty --noclear tty1
>  4475 root     1012  1086 /sbin/mingetty tty3
>  4476 root     1012  1086 /sbin/mingetty tty4
>  4477 root     1012  1086 /sbin/mingetty tty5
>  4478 root     1012  1086 /sbin/mingetty tty6
>  4465 root      992  1046 /usr/sbin/cron
>  7705 root      992  1047 /usr/sbin/cron
>  3709 root      964  1357 /sbin/resmgrd
>  4266 dhcpd     908  1139 /usr/sbin/dhcpd -chroot /var/lib/dhcp/ -lf /db/dhcpd.leases -user dhcpd -group nogroup eth0
>  8636 nagios    860   656 sh -c sudo -u root /usr/local/nagios/libexec/check_icmp -H THIS_IS_PRIVATE -w 300.0,30% -c 500.0,70% -p 10
>  4169 root      824   710 /usr/sbin/ypserv
>  4399 root      660   430 /usr/sbin/rpc.mountd
>  4722 root      528   655 /bin/bash bin/rrdloadsave.sh
>  7713 root      488   591 /bin/bash /usr/lib/cron/run-crons
>  7706 root      476   590 /bin/sh -c  test -x /usr/lib/cron/run-crons && /usr/lib/cron/run-crons >/dev/null 2>&1
>  7931 root      472   590 /bin/sh /etc/cron.daily/do_mandb
>  4481 nagios    424   419 nsca -c /usr/local/nagios/etc/nsca.cfg --inetd
>  4482 nagios    424   419 nsca -c /usr/local/nagios/etc/nsca.cfg --inetd
>  4570 nagios    424   419 nsca -c /usr/local/nagios/etc/nsca.cfg --inetd
>  4571 nagios    424   419 nsca -c /usr/local/nagios/etc/nsca.cfg --inetd
>  4658 nagios    424   419 nsca -c /usr/local/nagios/etc/nsca.cfg --inetd
>  4659 nagios    424   419 nsca -c /usr/local/nagios/etc/nsca.cfg --inetd
>  3840 named     412  8380 /usr/sbin/named -t /var/lib/named -u named
>  3646 root      340  1627 /usr/sbin/nmbd -D -s /etc/samba/smb.conf
>  3626 root      128  1596 /usr/sbin/saslauthd -a pam
>  3631 root      128  1596 /usr/sbin/saslauthd -a pam
>  3633 root      128  1596 /usr/sbin/saslauthd -a pam
>  3634 root      128  1596 /usr/sbin/saslauthd -a pam
>  3924 ldap      112 22147 /usr/lib/openldap/slapd -h ldap:/// -u ldap -g ldap -o slp=on
>  3701 root      108  6887 /usr/sbin/bacula-fd -c /etc/bacula/bacula-fd.conf
>  3729 cyrus     100  1426 /usr/lib/cyrus/bin/master -p /var/run/cyrus.pid -d
>  3912 mysql      52  6199 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/mysqld.pid --skip-locking --port=3306 --socket=/var/lib/mysql/mysql.sock
>  3593 root       48   361 /sbin/syslogd -a /var/lib/dhcp/dev/log -a /var/lib/named/dev/log -a /var/lib/ntp/dev/log
>  3927 cyrus      40  6795 idled
>     1 root       24   149 init [3]
>  3613 root       24  1770 /usr/sbin/snmpd -r -A -Lf /var/log/net-snmpd.log -p /var/run/snmpd.pid
>  2133 root       12   340 udevd
>  2440 root       12   358 [hwscand]
>  3459 root       12   358 [hwscand]
>  3598 root       12   379 /sbin/klogd -c 1 -2 -x
>  3719 nobody     12   357 /sbin/portmap
>  3801 root       12  1424 /usr/sbin/sshd -o PidFile=/var/run/sshd.init.pid
>  3863 root       12   591 /bin/sh /usr/bin/mysqld_safe --user=mysql --pid-file=/var/lib/mysql/mysqld.pid --socket=/var/lib/mysql/mysql.sock --datadir=/var/lib/mysql
>     2 root        0     0 [ksoftirqd/0]
>     3 root        0     0 [events/0]
>     4 root        0     0 [khelper]
>     5 root        0     0 [netlink/0]
>     6 root        0     0 [kblockd/0]
>    29 root        0     0 [kapmd]
>    31 root        0     0 [pdflush]
>    32 root        0     0 [pdflush]
>    34 root        0     0 [aio/0]
>    33 root        0     0 [kswapd0]
>   618 root        0     0 [kseriod]
>  1585 root        0     0 [reiserfs/0]
>  2077 root        0     0 [khubd]
>  2465 root        0     0 [khpsbpkt]
>  2483 root        0     0 [knodemgrd_0]
>  4375 root        0     0 [nfsd]
>  4376 root        0     0 [nfsd]
>  4377 root        0     0 [nfsd]
>  4378 root        0     0 [nfsd]
>  4382 root        0     0 [lockd]
>  4383 root        0     0 [rpciod]

As far as I can see, the sizes don't add to the amount given as used.

Any other ideas?

Arno

-- 
IT-Service Lehmann                    al at its-lehmann.de
Arno Lehmann                  http://www.its-lehmann.de


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