[CentOS] Server Hang

I have Cent OS 5.1

I also have http://phpsysinfo.sourceforge.net/

I have asterisk running .

Now when I look at System Information ,

I see that "Physical Memory" keep increasing and at one point it reaches
96%. Then my sever get hang and then I have to restart it.

I have 4 GB RAM.

Processors 2
Model Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz
CPU Speed 2.53 GHz
Cache Size 3.00 MB
System Bogomips 10135.71

Kernel Version 2.6.18-53.el5 (SMP)
Distro Name CentOS release 5 (Final)
Load Averages 0.27 0.35 0.31

What could be the reason ?


ps ax shows :




PID TTY STAT TIME COMMAND
1 ? Ss 0:00 init [3]
2 ? S 0:00 [migration/0]
3 ? SN 0:00 [ksoftirqd/0]
4 ? S 0:00 [watchdog/0]
5 ? S 0:00 [migration/1]
6 ? SN 0:00 [ksoftirqd/1]
7 ? S 0:00 [watchdog/1]
8 ? S< 0:00 [events/0]
9 ? S< 0:00 [events/1]
10 ? S< 0:00 [khelper]
11 ? S< 0:00 [kthread]
15 ? R< 0:00 [kblockd/0]
16 ? S< 0:00 [kblockd/1]
17 ? S< 0:00 [kacpid]
109 ? S< 0:00 [cqueue/0]
110 ? S< 0:00 [cqueue/1]
113 ? S< 0:00 [khubd]
115 ? S< 0:00 [kseriod]
182 ? S 0:00 [pdflush]
183 ? S 0:00 [pdflush]
184 ? S< 0:00 [kswapd0]
185 ? S< 0:00 [aio/0]
186 ? S< 0:00 [aio/1]
338 ? S< 0:00 [kpsmoused]
370 ? S< 0:00 [ata/0]
371 ? S< 0:00 [ata/1]
372 ? S< 0:00 [ata_aux]
376 ? S< 0:00 [scsi_eh_0]
377 ? S< 0:00 [scsi_eh_1]
378 ? D< 0:00 [kjournald]
405 ? S< 0:00 [kauditd]
439 ? S<s 0:00 /sbin/udevd -d
1374 ? S< 0:00 [kmpathd/0]
1375 ? S< 0:00 [kmpathd/1]
1405 ? S< 0:00 [kjournald]
1967 ? Ss 0:00 syslogd -m 0
1970 ? Ss 0:00 klogd -x
2021 ? Ss 0:00 portmap
2046 ? Ss 0:00 rpc.statd
2062 ? Ss 0:00 dbus-daemon --system
2103 ? Ss 0:00 /usr/sbin/acpid
2130 ? Ss 0:00 /usr/sbin/sshd
2219 ? S 0:00 /bin/sh /usr/bin/mysqld_safe --defaults-file=/etc/my.
2255 ? Sl 0:01 /usr/libexec/mysqld --defaults-file=/etc/my.cnf --bas
2294 ? Ss 0:00 sendmail: accepting connections
2302 ? Ss 0:00 sendmail: Queue runner at 01:00:00 for /var/spool/client
2320 ? Ss 0:00 /usr/sbin/httpd
2335 ? Ss 0:00 crond
2364 ? Ss 0:00 /usr/sbin/atd
2379 ? Ss 0:00 hald
2380 ? S 0:00 hald-runner
2387 ? S 0:00 /usr/sbin/httpd
2388 ? S 0:00 /usr/sbin/httpd
2389 ? S 0:00 /usr/sbin/httpd
2390 ? S 0:00 /usr/sbin/httpd
2391 ? S 0:00 /usr/sbin/httpd
2392 ? S 0:00 hald-addon-acpi: listening on acpid socket /var/run/a
2393 ? S 0:00 /usr/sbin/httpd
2394 ? S 0:00 /usr/sbin/httpd
2396 ? S 0:00 /usr/sbin/httpd
2397 ? S 0:00 /usr/libexec/hald-addon-cpufreq
2402 ? S 0:00 hald-addon-keyboard: listening on /dev/input/event0
2630 ? Ss 0:00 /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf
2746 ? Ss 0:00 /usr/bin/SCREEN -L -d -m -S asterisk /usr/sbin/asteri
2747 pts/0 Ssl+ 0:01 /usr/sbin/asterisk -vvvvvvvvvvvvvvvvvvvvvgc
2801 ? Ss 0:00 /usr/bin/SCREEN -d -m -S ASTupdate /usr/share/astguic
2803 pts/1 Ss+ 0:01 /usr/bin/perl /usr/share/astguiclient/AST_update.pl
2804 ? Ss 0:00 /usr/bin/SCREEN -d -m -S ASTsend /usr/share/astguicli
2805 pts/2 Ss+ 0:00 /usr/bin/perl /usr/share/astguiclient/AST_manager_sen
2807 ? Ss 0:00 /usr/bin/SCREEN -d -m -S ASTlisten /usr/share/astguic
2808 pts/3 Ss+ 0:00 /usr/bin/perl /usr/share/astguiclient/AST_manager_lis
2810 ? Ss 0:00 /usr/bin/SCREEN -d -m -S ASTVDauto /usr/share/astguic
2811 pts/4 Ss+ 0:00 /usr/bin/perl /usr/share/astguiclient/AST_VDauto_dial
2813 ? Ss 0:00 /usr/bin/SCREEN -d -m -S ASTVDremote /usr/share/astgu
2815 pts/5 Ss+ 0:00 /usr/bin/perl /usr/share/astguiclient/AST_VDremote_ag
2816 ? Ss 0:00 /usr/bin/SCREEN -d -m -S ASTVDadapt /usr/share/astgui
2818 pts/6 Ss+ 0:00 /usr/bin/perl /usr/share/astguiclient/AST_VDadapt.pl
2819 ? Ss 0:00 /usr/bin/SCREEN -d -m -S ASTfastlog /usr/share/astgui
2820 pts/7 Ss+ 0:00 /usr/bin/perl /usr/share/astguiclient/FastAGI_log.pl
2828 ? S 0:00 ip_relay 40569 127.0.0.1 4569 9999999
2829 ? S 0:00 ip_relay 41569 127.0.0.1 4569 9999999
2836 pts/7 S+ 0:00 /usr/bin/perl /usr/share/astguiclient/FastAGI_log.pl
2837 pts/7 S+ 0:00 /usr/bin/perl /usr/share/astguiclient/FastAGI_log.pl
2838 pts/7 S+ 0:00 /usr/bin/perl /usr/share/astguiclient/FastAGI_log.pl
2839 pts/7 S+ 0:00 /usr/bin/perl /usr/share/astguiclient/FastAGI_log.pl
2840 pts/7 S+ 0:00 /usr/bin/perl /usr/share/astguiclient/FastAGI_log.pl
2869 ? S 0:00 /usr/sbin/smartd -q never
2875 ? Ss 0:00 /usr/bin/perl /usr/libexec/webmin/miniserv.pl /etc/we
2880 tty1 Ss+ 0:00 /sbin/mingetty tty1
2883 tty2 Ss+ 0:00 /sbin/mingetty tty2
2884 tty3 Ss+ 0:00 /sbin/mingetty tty3
2885 tty4 Ss+ 0:00 /sbin/mingetty tty4
2886 tty5 Ss+ 0:00 /sbin/mingetty tty5
2887 tty6 Ss+ 0:00 /sbin/mingetty tty6
3040 ? S 0:00 crond
3047 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
3072 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
3191 ? S 0:00 crond
3199 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
3212 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
3699 ? S 0:00 crond
3705 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
3718 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
4090 ? S 0:00 crond
4096 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
4112 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
5027 ? S 0:00 crond
5030 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
5049 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
5572 ? S 0:00 crond
5578 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
5592 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
6982 ? S 0:00 crond
6988 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
7012 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
7782 ? S 0:00 crond
7787 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
7810 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
9586 ? S 0:00 crond
9594 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
9623 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
10562 ? S 0:00 crond
10564 ? S 0:00 crond
10568 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_CRON_audio_
10569 ? Ss 0:00 /usr/bin/perl /usr/share/astguiclient/AST_manager_kil
10597 ? S 0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t
10988 ? Ss 0:00 sshd: root at pts/8
11045 pts/8 Ss 0:00 -bash
11355 pts/8 R+ 0:00 ps ax

I used VicidialNOW CD which comes with integrated CentOS and Asterisk.

1) If I upgrade kernel , wont it break the functionality of any files ?
2) If it wotn break, then how to upgrade ?
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