linux日志分析

faintlife

已经连续三周出现同一个问题，时间间隔都是6天的样子，下面是找到的日志，请大家帮忙分析，
情况描述：错误发生前telnet 以及ssh 都能远程登录，错误发生后，telnet以及ssh在输完用户名以及密码后，登录验证完后，秒退出来，

4.20的日志错误部分：
init: tty (/dev/tty2) main process (3495) killed by TERM signal
init: tty (/dev/tty3) main process (3497) killed by TERM signal
init: tty (/dev/tty4) main process (3499) killed by TERM signal
init: tty (/dev/tty5) main process (3501) killed by TERM signal
init: tty (/dev/tty6) main process (3503) killed by TERM signal
gnome-keyring-daemon[3675]: dbus failure unregistering from session: Connection is closed
gnome-keyring-daemon[3675]: GVFS-RemoteVolumeMonitor: cannot remove match rule 'type='signal',interface='org.gtk.Private.RemoteVolumeMonitor',sender='org.gtk.Private.AfcVolumeMonitor',': org.freedesktop.DBus.Error.Disconnected: Connection is closed
gnome-keyring-daemon[3675]: GVFS-RemoteVolumeMonitor: cannot remove match rule 'type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.gtk.Private.AfcVolumeMonitor'': org.freedesktop.DBus.Error.Disconnected: Connection is closed
gnome-keyring-daemon[3675]: GVFS-RemoteVolumeMonitor: cannot remove match rule 'type='signal',interface='org.gtk.Private.RemoteVolumeMonitor',sender='org.gtk.Private.GPhoto2VolumeMonitor',': org.freedesktop.DBus.Error.Disconnected: Connection is closed
gnome-keyring-daemon[3675]: GVFS-RemoteVolumeMonitor: cannot remove match rule 'type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.gtk.Private.GPhoto2VolumeMonitor'': org.freedesktop.DBus.Error.Disconnected: Connection is closed
gnome-keyring-daemon[3675]: GVFS-RemoteVolumeMonitor: cannot remove match rule 'type='signal',interface='org.gtk.Private.RemoteVolumeMonitor',sender='org.gtk.Private.GduVolumeMonitor',': org.freedesktop.DBus.Error.Disconnected: Connection is closed
gnome-keyring-daemon[3675]: GVFS-RemoteVolumeMonitor: cannot remove match rule 'type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='org.gtk.Private.GduVolumeMonitor'': org.freedesktop.DBus.Error.Disconnected: Connection is closed
gnome-keyring-daemon[3675]: dbus failure unregistering from session: Connection is closed
rtkit-daemon[2609]: Sucessfully made thread 91267 of process 91267 (/usr/bin/pulseaudio) owned by '20' high priority at nice level -11.
pulseaudio[91267]: pid.c: Stale PID file, overwriting.
rtkit-daemon[2609]: Sucessfully made thread 91270 of process 91270 (/usr/bin/pulseaudio) owned by '20' high priority at nice level -11.

4.26日错误日志部分：
init: tty (/dev/tty2) main process (3505) killed by TERM signal
init: tty (/dev/tty3) main process (3507) killed by TERM signal
init: tty (/dev/tty4) main process (3509) killed by TERM signal
init: tty (/dev/tty5) main process (3511) killed by TERM signal
init: tty (/dev/tty6) main process (3513) killed by TERM signal
gnome-keyring-daemon[3704]: dbus failure unregistering from session: Connection is closed
rtkit-daemon[2617]: Sucessfully made thread 11777 of process 11777 (/usr/bin/pulseaudio) owned by '20' high priority at nice level -11.
pulseaudio[11777]: pid.c: Stale PID file, overwriting.
rtkit-daemon[2617]: Sucessfully made thread 11780 of process 11780 (/usr/bin/pulseaudio) owned by '20' high priority at nice level -11.

5.2日错误日志部分：
init: tty (/dev/tty2) main process (3502) killed by TERM signal
init: tty (/dev/tty3) main process (3504) killed by TERM signal
init: tty (/dev/tty4) main process (3506) killed by TERM signal
init: tty (/dev/tty5) main process (350 killed by TERM signal
init: tty (/dev/tty6) main process (3510) killed by TERM signal
gnome-keyring-daemon[3680]: dbus failure unregistering from session: Connection is closed
seahorse-daemon[3678]: Failed to send buffer
seahorse-daemon[3678]: Failed to send buffer
rtkit-daemon[2611]: Sucessfully made thread 12374 of process 12374 (/usr/bin/pulseaudio) owned by '20' high priority at nice level -11.
pulseaudio[12374]: pid.c: Stale PID file, overwriting.
rtkit-daemon[2611]: Sucessfully made thread 12377 of process 12377 (/usr/bin/pulseaudio) owned by '20' high priority at nice level -11.