It is very unclear to me what the problem is. You say the problem is on with the guest, but say "i killed the server on 09:07". It is not clear whether some of the information is on the host or guest, nor if it was a one-time problem, or is still occurring.

Hi there

I have s strange problem on one of our virtual servers which both the host and the guest run under centos. Guest is CentOS 6.2 with all updates installed.

Here are some log entries from different logfiles i killed the server on 09:07.

/var/log/messages:
Mar 21 08:08:33 lin-zarafa1 ntpd[1776]: synchronized to 195.141.190.190, stratum 2
Mar 21 08:25:37 lin-zarafa1 ntpd[1776]: synchronized to 129.132.2.21, stratum 2
Mar 21 09:07:13 lin-zarafa1 kernel: imklog 4.6.2, log source = /proc/kmsg started.
Mar 21 09:07:13 lin-zarafa1 rsyslogd: [origin software="rsyslogd" swVersion="4.6.2" x-pid="1402" x-info="http://www.rsyslog.com"] (re)start
Mar 21 09:07:13 lin-zarafa1 kernel: Initializing cgroup subsys cpuset

/var/log/secure:
Mar 20 12:38:23 lin-zarafa1 sshd[2056]: pam_unix(sshd:session): session closed for user root
Mar 21 09:07:14 lin-zarafa1 runuser: pam_unix(runuser:session): session opened for user root by (uid=0)

And there is nothing unusual what i see, on the kvm virt-manager i see on the screen messages like

INFO: task jbd2/dm-0-8:435 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task jbd2/dm-2-8:972 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task ts:main Q:Reg:1399 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task slapd:2122 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task slapd:2780 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task mysqld:2255 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task mysqld:2265 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task httpd:2243 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task httpd:3509 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
INFO: task cleanup:10427 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

in this state i can press alt + F2 and switch the terminal and kann type the username but after enter nothing happens and it seems that system is hang.

There is also a virtual win2k3 server on this physical server and he has no problems. the data files are on the same store. Both have 4gb ram and 8 cpu's.

Current the top don't display something unusual

top - 09:27:33 up 20 min, 2 users, load average: 0.61, 0.54, 0.42
Tasks: 247 total, 1 running, 246 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.2%us, 0.1%sy, 0.0%ni, 99.4%id, 0.2%wa, 0.0%hi, 0.1%si, 0.0%st
Mem: 3923480k total, 2807924k used, 1115556k free, 214468k buffers
Swap: 7372792k total, 0k used, 7372792k free, 1969616k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2076 root 20 0 496m 105m 6028 S 0.0 2.7 1:01.77 /usr/bin/zarafa-server -c /etc/zarafa/server.cfg
2135 root 20 0 494m 91m 6152 S 0.0 2.4 0:51.91 /usr/bin/zarafa-indexer -c /etc/zarafa/indexer.cfg
1729 ldap 20 0 1012m 74m 13m S 0.0 1.9 0:00.77 /usr/sbin/slapd -h ldap:/// ldapi:/// -u ldap
2234 apache 20 0 464m 46m 6312 S 0.0 1.2 0:03.84 /usr/sbin/httpd
1905 mysql 20 0 1332m 41m 4788 S 0.0 1.1 2:27.88 /usr/libexec/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/va
2240 apache 20 0 443m 25m 7072 S 0.0 0.7 0:03.09 /usr/sbin/httpd
2235 apache 20 0 443m 24m 6332 S 0.0 0.6 0:00.72 /usr/sbin/httpd
2236 apache 20 0 440m 22m 7036 S 0.0 0.6 0:00.42 /usr/sbin/httpd
2239 apache 20 0 439m 22m 7080 S 0.0 0.6 0:00.32 /usr/sbin/httpd
2238 apache 20 0 439m 21m 6256 S 0.0 0.6 0:00.39 /usr/sbin/httpd
2233 apache 20 0 439m 20m 5284 S 0.0 0.5 0:00.28 /usr/sbin/httpd
- snip -

Has someone a idea what this coul'd be or where i should look if there is a problem? I don't find something unusual. the server runs before this weeks without any problems.

Greetings