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Old 02-29-2008, 12:58 PM   #1
eaglek96
LQ Newbie
 
Registered: Feb 2008
Location: Massachusetts
Distribution: Debian Linux and FreeBSD
Posts: 12

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Linux System not allowing new shells, then freezes


Hello,

I'm new to the forums, but have been using Debian for about 4 years, and linux for about 10. If I'm posting in the wrong place, or if there is a better place to post this kind of problem please let me know.

I'm having a problem with my debian system that I am using as a web server. Here are the specifics:

Debian Linux "Etch"
Linux hostname 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686 GNU/Linux
Poweredge 2950 4G RAM
Apache 2.0.59
Tomcat 5.0.28
Sun Java 1.5.0
Mod_JK 1.2.23
Anonymous FTP via in.ftpd

The server functions as a web server. For the most part, the box appears to be OK. There isn't a tremendous amount of load on it, and it rarely has to do any swapping. The problem is, now and then it has been prone to "freezing" up over time. When I say freezing up, it isn't something that happens instantly. It happens over a long period of time.

Over an extended time period (maybe a week), the box at some point refuses to start new shells. This causes things like SSH and FTP to prompt for username/password, but never start a session. If I'm already logged in from previous days, I can use my shell with no problem, but anytime I try to start a new shell, or su to a different user, I get no response, and it will sit there until I Ctrl-C it. As a result of this problem, a bunch of hanging processes get left on the machine waiting forever for a shell. This also causes CRON jobs to start failing, since cron invokes shells too. After a few hours, if I run ps aux I get a lot of processes that appear to be hung:

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 1948 652 ? Ss Feb21 0:01 init [2]
root 2 0.0 0.0 0 0 ? S Feb21 0:00 [migration/0]
root 3 0.0 0.0 0 0 ? SN Feb21 0:00 [ksoftirqd/0]
root 4 0.0 0.0 0 0 ? S Feb21 0:00 [migration/1]
root 5 0.0 0.0 0 0 ? SN Feb21 0:00 [ksoftirqd/1]
root 6 0.0 0.0 0 0 ? S Feb21 0:00 [migration/2]
root 7 0.0 0.0 0 0 ? SN Feb21 0:00 [ksoftirqd/2]
root 8 0.0 0.0 0 0 ? S Feb21 0:00 [migration/3]
root 9 0.0 0.0 0 0 ? SN Feb21 0:00 [ksoftirqd/3]
root 10 0.0 0.0 0 0 ? S< Feb21 0:00 [events/0]
root 11 0.0 0.0 0 0 ? S< Feb21 0:00 [events/1]
root 12 0.0 0.0 0 0 ? S< Feb21 0:00 [events/2]
root 13 0.0 0.0 0 0 ? S< Feb21 0:00 [events/3]
root 14 0.0 0.0 0 0 ? S< Feb21 0:00 [khelper]
root 15 0.0 0.0 0 0 ? S< Feb21 0:00 [kthread]
root 21 0.0 0.0 0 0 ? S< Feb21 0:00 [kblockd/0]
root 22 0.0 0.0 0 0 ? S< Feb21 0:00 [kblockd/1]
root 23 0.0 0.0 0 0 ? S< Feb21 0:00 [kblockd/2]
root 24 0.0 0.0 0 0 ? S< Feb21 0:00 [kblockd/3]
root 25 0.0 0.0 0 0 ? S< Feb21 0:00 [kacpid]
root 137 0.0 0.0 0 0 ? S< Feb21 0:00 [kseriod]
root 190 0.0 0.0 0 0 ? S Feb21 0:00 [pdflush]
root 191 0.0 0.0 0 0 ? S Feb21 0:01 [pdflush]
root 192 0.0 0.0 0 0 ? S< Feb21 0:02 [kswapd0]
root 193 0.0 0.0 0 0 ? S< Feb21 0:00 [aio/0]
root 194 0.0 0.0 0 0 ? S< Feb21 0:00 [aio/1]
root 195 0.0 0.0 0 0 ? S< Feb21 0:00 [aio/2]
root 196 0.0 0.0 0 0 ? S< Feb21 0:00 [aio/3]
root 364 0.0 0.0 0 0 ? S Feb21 0:00 [kirqd]
root 774 0.0 0.0 0 0 ? S< Feb21 0:00 [khubd]
root 840 0.0 0.0 0 0 ? S< Feb21 0:00 [scsi_eh_0]
root 1244 0.0 0.0 0 0 ? S< Feb21 0:00 [kjournald]
root 1438 0.0 0.0 2176 616 ? S<s Feb21 0:00 udevd --daemon
root 1906 0.0 0.0 0 0 ? S< Feb21 0:00 [kpsmoused]
root 2113 0.0 0.0 0 0 ? S< Feb21 0:00 [kmirrord]
root 2185 0.0 0.0 0 0 ? S< Feb21 0:00 [kjournald]
root 2187 0.0 0.0 0 0 ? S< Feb21 0:00 [kjournald]
root 2189 0.0 0.0 0 0 ? S< Feb21 0:00 [kjournald]
root 2191 0.0 0.0 0 0 ? S< Feb21 0:02 [kjournald]
root 2193 0.0 0.0 0 0 ? S< Feb21 0:00 [kjournald]
daemon 2269 0.0 0.0 1684 372 ? Ss Feb21 0:00 /sbin/portmap
root 2562 0.0 0.0 1632 628 ? Ss Feb21 0:00 /sbin/syslogd
root 2568 0.0 0.0 1576 384 ? Ss Feb21 0:00 /sbin/klogd -x
root 2645 0.0 0.0 2668 1336 ? S Feb21 0:00 /bin/sh /usr/bin/mysqld_safe
mysql 2682 0.0 0.6 128580 21876 ? Sl Feb21 0:46 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock
root 2683 0.0 0.0 1564 512 ? S Feb21 0:00 logger -p daemon.err -t mysqld_safe -i -t mysqld
root 2799 0.0 0.0 1576 568 ? Ss Feb21 0:00 /usr/sbin/acpid -c /etc/acpi/events -s /var/run/acpid.socket
100 2847 0.0 0.0 5320 1000 ? Ss Feb21 0:00 /usr/sbin/exim4 -bd -q30m
root 2869 0.0 0.0 4924 1088 ? Ss Feb21 0:00 /usr/sbin/sshd
statd 2888 0.0 0.0 1756 736 ? Ss Feb21 0:00 /sbin/rpc.statd
ntp 2901 0.0 0.0 4132 1316 ? Ss Feb21 0:00 /usr/sbin/ntpd -p /var/run/ntpd.pid -u 106:106 -g
daemon 2911 0.0 0.0 1832 420 ? Ss Feb21 0:00 /usr/sbin/atd
root 2918 0.0 0.0 2196 884 ? Ss Feb21 0:00 /usr/sbin/cron
root 2971 0.0 0.0 4272 2148 ? S Feb21 0:03 /usr/netvault/bin/nvpmgr startup
root 2989 0.0 0.0 3308 1480 ? S Feb21 0:00 nvcmgr 2
root 2990 0.0 0.0 1576 492 tty1 Ss+ Feb21 0:00 /sbin/getty 38400 tty1
root 2991 0.0 0.0 1576 492 tty2 Ss+ Feb21 0:00 /sbin/getty 38400 tty2
root 2992 0.0 0.0 1572 496 tty3 Ss+ Feb21 0:00 /sbin/getty 38400 tty3
root 2993 0.0 0.0 1576 492 tty4 Ss+ Feb21 0:00 /sbin/getty 38400 tty4
root 2994 0.0 0.0 1572 496 tty5 Ss+ Feb21 0:00 /sbin/getty 38400 tty5
root 2995 0.0 0.0 1576 492 tty6 Ss+ Feb21 0:00 /sbin/getty 38400 tty6
root 3006 0.0 0.0 3604 1860 ? S Feb21 0:16 nvnmgr 3
root 3007 0.0 0.0 4844 2524 ? S Feb21 0:01 nvstatsmngr 9
bind 23205 0.1 0.3 63116 10480 ? Ssl Feb25 4:56 /usr/sbin/named -u bind
root 589 0.0 0.0 7696 2256 ? Ss Feb27 0:00 sshd: sysadmin [priv]
sysadmin 591 0.0 0.0 7696 1616 ? S Feb27 0:00 sshd: sysadmin@pts/3
sysadmin 592 0.0 0.0 5380 2900 pts/3 Ss Feb27 0:00 -bash
root 648 0.0 0.0 3716 1084 pts/3 S Feb27 0:00 su
root 649 0.0 0.0 3992 1740 pts/3 S+ Feb27 0:00 bash
root 2961 0.0 0.0 7696 2256 ? Ss Feb27 0:00 sshd: sysadmin [priv]
sysadmin 2963 0.0 0.0 7832 1632 ? S Feb27 0:00 sshd: sysadmin@pts/0
sysadmin 2964 0.0 0.0 5384 2904 pts/0 Ss Feb27 0:00 -bash
root 2984 0.0 0.0 3716 1080 pts/0 S Feb27 0:00 su
root 2985 0.0 0.0 4000 1744 pts/0 S Feb27 0:00 bash
root 3048 0.0 0.0 7700 2260 ? Ss Feb27 0:00 sshd: sysadmin [priv]
sysadmin 3050 0.0 0.0 7700 1620 ? S Feb27 0:00 sshd: sysadmin@pts/4
sysadmin 3051 0.0 0.0 5384 2912 pts/4 Ss Feb27 0:00 -bash
root 11860 0.2 4.7 1165652 160552 ? Sl 02:10 0:59 /usr/lib/jvm/java-1.5.0-sun/bin/java -Djava.endorsed.dirs=/usr/local/tomcat/common/endorsed -classpath /usr/lib/jvm/java-1.5.0-sun/lib/tools.jar:/usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/commons-logging-api.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start
root 11889 0.0 0.2 16368 8056 ? Ss 02:10 0:00 /usr/local/apache2/bin/httpd -k start
root 12111 0.0 0.0 2528 816 ? D 03:01 0:00 /USR/SBIN/CRON
root 12112 0.0 0.0 2528 816 ? S 03:01 0:00 /USR/SBIN/CRON
root 12113 0.0 0.0 2528 804 ? S 03:05 0:00 /USR/SBIN/CRON
root 12118 0.0 0.0 2528 804 ? S 03:15 0:00 /USR/SBIN/CRON
root 12119 0.0 0.0 2528 804 ? S 03:15 0:00 /USR/SBIN/CRON
root 12120 0.0 0.0 2528 804 ? S 03:15 0:00 /USR/SBIN/CRON
root 12121 0.0 0.0 2528 804 ? S 03:17 0:00 /USR/SBIN/CRON
root 12124 0.0 0.0 2528 804 ? S 03:25 0:00 /USR/SBIN/CRON
root 12126 0.0 0.0 2528 804 ? S 03:35 0:00 /USR/SBIN/CRON
root 12136 0.0 0.0 2528 804 ? S 03:45 0:00 /USR/SBIN/CRON
root 12148 0.0 0.0 2528 804 ? S 03:55 0:00 /USR/SBIN/CRON
root 12169 0.0 0.0 2528 804 ? S 04:05 0:00 /USR/SBIN/CRON
root 12176 0.0 0.0 2528 804 ? S 04:15 0:00 /USR/SBIN/CRON
root 12177 0.0 0.0 2528 804 ? S 04:15 0:00 /USR/SBIN/CRON
root 12178 0.0 0.0 2528 804 ? S 04:15 0:00 /USR/SBIN/CRON
root 12179 0.0 0.0 2528 804 ? S 04:17 0:00 /USR/SBIN/CRON
root 12182 0.0 0.0 2528 804 ? S 04:25 0:00 /USR/SBIN/CRON
root 12185 0.0 0.0 2528 804 ? S 04:35 0:00 /USR/SBIN/CRON
root 12202 0.0 0.0 2528 804 ? S 04:45 0:00 /USR/SBIN/CRON
root 12212 0.0 0.0 2528 804 ? S 04:55 0:00 /USR/SBIN/CRON
root 12213 0.0 0.0 1724 624 ? Ss 04:56 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 12235 0.0 0.0 2528 804 ? S 05:05 0:00 /USR/SBIN/CRON
root 12238 0.0 0.0 2528 804 ? S 05:15 0:00 /USR/SBIN/CRON
root 12239 0.0 0.0 2528 804 ? S 05:15 0:00 /USR/SBIN/CRON
root 12240 0.0 0.0 2528 804 ? S 05:15 0:00 /USR/SBIN/CRON
root 12244 0.0 0.0 2528 804 ? S 05:17 0:00 /USR/SBIN/CRON
root 12266 0.0 0.0 1724 624 ? Ss 05:20 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 12286 0.0 0.0 2528 804 ? S 05:25 0:00 /USR/SBIN/CRON
root 12292 0.0 0.0 2528 804 ? S 05:35 0:00 /USR/SBIN/CRON
root 12296 0.0 0.0 2528 804 ? S 05:45 0:00 /USR/SBIN/CRON
root 12334 0.0 0.0 2528 804 ? S 05:55 0:00 /USR/SBIN/CRON
root 12336 0.0 0.0 2528 804 ? S 06:02 0:00 /USR/SBIN/CRON
root 12338 0.0 0.0 2528 804 ? S 06:04 0:00 /USR/SBIN/CRON
root 12339 0.0 0.0 2528 804 ? S 06:05 0:00 /USR/SBIN/CRON
root 12340 0.0 0.0 2528 804 ? S 06:06 0:00 /USR/SBIN/CRON
root 12342 0.0 0.0 2528 804 ? S 06:08 0:00 /USR/SBIN/CRON
root 12343 0.0 0.0 2528 804 ? S 06:12 0:00 /USR/SBIN/CRON
root 12357 0.0 0.0 2528 804 ? S 06:15 0:00 /USR/SBIN/CRON
root 12358 0.0 0.0 2528 804 ? S 06:15 0:00 /USR/SBIN/CRON
root 12359 0.0 0.0 2528 804 ? S 06:15 0:00 /USR/SBIN/CRON
root 12360 0.0 0.0 2528 804 ? S 06:17 0:00 /USR/SBIN/CRON
root 12364 0.0 0.0 2528 804 ? S 06:25 0:00 /USR/SBIN/CRON
root 12375 0.0 0.0 2528 804 ? S 06:35 0:00 /USR/SBIN/CRON
root 12404 0.0 0.0 2528 804 ? S 06:45 0:00 /USR/SBIN/CRON
root 12454 0.0 0.0 2528 804 ? S 06:55 0:00 /USR/SBIN/CRON
root 12504 0.0 0.0 2528 804 ? S 07:05 0:00 /USR/SBIN/CRON
root 12580 0.0 0.0 2528 804 ? S 07:15 0:00 /USR/SBIN/CRON
root 12581 0.0 0.0 2528 804 ? S 07:15 0:00 /USR/SBIN/CRON
root 12582 0.0 0.0 2528 804 ? S 07:15 0:00 /USR/SBIN/CRON
root 12598 0.0 0.0 2528 804 ? S 07:17 0:00 /USR/SBIN/CRON
root 12685 0.0 0.0 2528 804 ? S 07:25 0:00 /USR/SBIN/CRON
root 12741 0.0 0.0 2528 804 ? S 07:35 0:00 /USR/SBIN/CRON
root 12857 0.0 0.0 2528 804 ? S 07:45 0:00 /USR/SBIN/CRON
root 12950 0.0 0.0 2528 804 ? S 07:55 0:00 /USR/SBIN/CRON
root 13056 0.0 0.0 2528 804 ? S 08:05 0:00 /USR/SBIN/CRON
root 13231 0.0 0.0 2528 804 ? S 08:15 0:00 /USR/SBIN/CRON
root 13232 0.0 0.0 2528 804 ? S 08:15 0:00 /USR/SBIN/CRON
root 13233 0.0 0.0 2528 804 ? S 08:15 0:00 /USR/SBIN/CRON
root 13261 0.0 0.0 2528 804 ? S 08:17 0:00 /USR/SBIN/CRON
root 13370 0.0 0.0 2528 804 ? S 08:25 0:00 /USR/SBIN/CRON
root 13582 0.0 0.0 2528 804 ? S 08:35 0:00 /USR/SBIN/CRON
root 13715 0.0 0.0 2528 804 ? S 08:45 0:00 /USR/SBIN/CRON
root 13853 0.0 0.0 2528 804 ? S 08:55 0:00 /USR/SBIN/CRON
root 14015 0.0 0.0 2528 804 ? S 09:05 0:00 /USR/SBIN/CRON
root 14202 0.0 0.0 2528 804 ? S 09:15 0:00 /USR/SBIN/CRON
root 14203 0.0 0.0 2528 804 ? S 09:15 0:00 /USR/SBIN/CRON
root 14204 0.0 0.0 2528 804 ? S 09:15 0:00 /USR/SBIN/CRON
root 14291 0.0 0.0 2528 804 ? S 09:17 0:00 /USR/SBIN/CRON
root 14413 0.0 0.0 1724 628 ? Ss 09:24 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 14422 0.0 0.0 2528 804 ? S 09:25 0:00 /USR/SBIN/CRON
root 14438 0.0 0.0 1720 616 ? Ss 09:25 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 14466 0.0 0.0 1724 628 ? Ss 09:26 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 14482 0.0 0.0 1724 620 ? Ss 09:27 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 14491 0.0 0.0 1724 624 ? Ss 09:28 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 14529 0.0 0.0 1724 624 ? Ss 09:30 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 14578 0.0 0.0 1748 576 ? Ss 09:32 0:00 /usr/sbin/inetd
root 14582 0.0 0.0 1720 620 ? Ss 09:32 0:00 /usr/sbin/in.ftpd -ll -S -u002
root 14584 0.0 0.0 6484 2208 ? Ss 09:32 0:00 sshd: sysadmin [priv]
sshd 14585 0.0 0.0 0 0 ? Z 09:32 0:00 [sshd] <defunct>
root 14641 0.0 0.0 2528 804 ? S 09:35 0:00 /USR/SBIN/CRON
nobody 14681 0.0 0.2 16492 7712 ? S 09:36 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14692 0.0 0.2 16624 8332 ? S 09:37 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14709 0.0 0.2 16492 7700 ? S 09:38 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14714 0.0 0.2 16476 7700 ? S 09:38 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14722 0.0 0.2 16492 7648 ? S 09:38 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14724 0.0 0.2 16476 7660 ? S 09:38 0:00 /usr/local/apache2/bin/httpd -k start
sysadmin 14733 0.0 0.0 2360 1204 pts/4 S+ 09:39 0:00 top
nobody 14734 0.0 0.2 16492 7688 ? S 09:40 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14735 0.0 0.2 16492 7716 ? S 09:40 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14736 0.0 0.2 16492 7664 ? S 09:40 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14737 0.0 0.2 16368 7628 ? S 09:40 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14738 0.0 0.2 16492 7704 ? S 09:40 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14739 0.0 0.2 16368 7516 ? S 09:40 0:00 /usr/local/apache2/bin/httpd -k start
nobody 14741 0.0 0.2 16476 7704 ? S 09:40 0:00 /usr/local/apache2/bin/httpd -k start
root 14742 0.0 0.0 3428 1004 pts/0 R+ 09:40 0:00 ps aux


After a few more hours of this, the system will finally freeze up totally, and will lose network response as well.

Anyone want to give any clues as to where I can start looking for the cause of this?

Thanks in advance.

Rob
 
Old 02-29-2008, 01:17 PM   #2
jailbait
Guru
 
Registered: Feb 2003
Location: Blue Ridge Mountain
Distribution: Debian Wheezy, Debian Jessie
Posts: 7,509

Rep: Reputation: 177Reputation: 177
One possible cause of this problem is a memory leak. One of your always running programs might be allocating memory and then forgetting to free it. One way to diagnose a memory leak is this:

When you get into the problem instead of booting try stopping your 24/7 programs one by one with a few minutes wait between stopping them. If you have a memory leak then stopping the culprit should free up all of its memory and your system should revive.

-----------------------
Steve Stites
 
Old 02-29-2008, 02:47 PM   #3
marozsas
Senior Member
 
Registered: Dec 2005
Location: Campinas/SP - Brazil
Distribution: SuSE, RHEL, Fedora, Ubuntu
Posts: 1,393
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Rep: Reputation: 63
These /USR/SBIN/CRON all in capital letters are suspicious.
First the capital letters itself are suspicious. I expect /usr/sbin/cron.
Second, even they are fine and for some reason they are in capital letters, they may are exhausting your resources.

So, please, investigate why theses process are in capital letters, who and when they are fired and what they are doing and why they apparently not finish after a while.
 
Old 02-29-2008, 03:57 PM   #4
eaglek96
LQ Newbie
 
Registered: Feb 2008
Location: Massachusetts
Distribution: Debian Linux and FreeBSD
Posts: 12

Original Poster
Rep: Reputation: 0
Quote:
Originally Posted by marozsas View Post
These /USR/SBIN/CRON all in capital letters are suspicious.
First the capital letters itself are suspicious. I expect /usr/sbin/cron.
Interestingly enough, if I put a line in crontab running "sleep 30" and then restart the cron process, a ps aux shows /USR/SBIN/CRON. Some reading suggests that the capital letters signifies that it's a child process of 'cron'. This happens on any Debian box I try.

I am going to see if anything in these crons that run nightly is hanging up the system. The only thing I can think of is the fact that once a week it has to rotate out a log file that is over 1GB. That may be the issue. Mostly, the only crons that run are the stock ones with debian. The reason that these processes are taking up system resources is that they can't initiate a shell to complete the process, so they just hang out and wait. I'm pretty sure I just have to find the one process (maybe zombied) that is causing it to break.

Thanks for the help so far, and I'll post again if I find out more.
 
  


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