Hi I got detail information from /var/log files. When Debian jessie was frozen,I got below gnome error messages.
This issue is happen under accessing cryptsetup volumes and using Virtualbox. I confirmed that it is caused by below versions. Virtualbox4.3.28 and 5.0. kernel 4.0.7 and 4.0.8 with Debian jessie 8.1. Thank you sys.log Jul 11 12:15:04 svyomo2 kernel: [ 670.934503] r8169 0000:08:00.0 eth1: link up Jul 11 12:15:04 svyomo2 kernel: [ 670.938510] bond1: link status definitely up for interface eth1, 1000 Mbps full duplex Jul 11 12:15:04 svyomo2 kernel: [ 671.058408] r8169 0000:08:02.0 eth4: link up Jul 11 12:15:04 svyomo2 NetworkManager[1363]: <info> (eth4): link connected Jul 11 12:15:04 svyomo2 kernel: [ 671.110616] bond0: link status definitely up for interface eth4, 1000 Mbps full duplex Jul 11 12:15:06 svyomo2 systemd[1]: Found ordering cycle on basic.target/stop Jul 11 12:15:06 svyomo2 systemd[1]: Found dependency on sysinit.target/stop Jul 11 12:15:06 svyomo2 systemd[1]: Found dependency on rpcbind.service/stop Jul 11 12:15:06 svyomo2 systemd[1]: Found dependency on network-online.target/stop Jul 11 12:15:06 svyomo2 systemd[1]: Found dependency on NetworkManager-wait-online.service/stop Jul 11 12:15:06 svyomo2 systemd[1]: Found dependency on NetworkManager.service/stop Jul 11 12:15:06 svyomo2 systemd[1]: Found dependency on basic.target/stop Jul 11 12:15:06 svyomo2 systemd[1]: Breaking ordering cycle by deleting job sysinit.target/stop Jul 11 12:15:06 svyomo2 systemd[1]: Job sysinit.target/stop deleted to break ordering cycle starting with basic.target/stop Jul 11 12:15:06 svyomo2 gnome-session[2191]: nm-applet-Message: PID 1 (we are 2435) sent signal 15, shutting down... Jul 11 12:15:06 svyomo2 org.gnome.zeitgeist.Engine[2263]: (zeitgeist-daemon:2444): GLib-GObject-CRITICAL **: g_object_unref: a ssertion 'object->ref_count > 0' failed Jul 11 12:15:06 svyomo2 gnome-session[2191]: Received signal:15->'Terminated' Jul 11 12:15:06 svyomo2 gnome-session[2191]: Received signal:15->'Terminated' Jul 11 12:15:06 svyomo2 gnome-session[2191]: Received signal:15->'Terminated' Jul 11 12:15:06 svyomo2 gnome-session[2191]: Received signal:1->'Hangup' Jul 11 12:15:06 svyomo2 gnome-session[2191]: Received signal:15->'Terminated' Jul 11 12:15:06 svyomo2 pulseaudio[2325]: 2 sink(s) available. Jul 11 12:15:06 svyomo2 pulseaudio[2325]: index: 0 Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011name: <alsa_output.pci-0000_01_00.1.hdmi-stereo> Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011driver: <module-alsa-card.c> Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011flags: HARDWARE DECIBEL_VOLUME LATENCY FLAT_VOLUME DYNAMIC_LATENCY Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011state: SUSPENDED Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011suspend cause: IDLE Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011priority: 9050 Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 d B Jul 11 12:15:06 svyomo2 pulseaudio[2325]: #011 balance 0.00 Jul 11 12:15:06 svyomo2 rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="1408" x-info="http://www.rsyslog.com"] exiting on signal 15. Jul 11 12:16:40 svyomo2 rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="1767" x-info="http://www.rsyslog.com"] start Jul 11 12:16:40 svyomo2 systemd-modules-load[310]: Inserted module 'lp' Jul 11 12:16:40 svyomo2 systemd-modules-load[310]: Inserted module 'ppdev' Jul 11 12:16:40 svyomo2 systemd-modules-load[310]: Inserted module 'parport_pc' Jul 11 12:16:40 svyomo2 systemd-modules-load[310]: Inserted module 'fuse' Jul 11 12:16:40 svyomo2 nfs-common[316]: Starting NFS common utilities: statd Jul 11 12:16:40 svyomo2 nfs-common[316]: Not starting: portmapper is not running ... (warning). Jul 11 12:16:40 svyomo2 mdadm-raid[336]: Generating udev events for MD arrays...done. Jul 11 12:16:40 svyomo2 keyboard-setup[337]: Setting preliminary keymap...done. Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 9: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.1/4-1.1.2" Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 8: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.2/4-1.2.2" Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 3, device 2: "/sys/devices/pci0000:00/0000:00:1c.5/0000:05:00.0/usb3/3-1" Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 6: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.1/4-1.1.1" Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 13: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.1/4-1.1.4" Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 2, device 2: "/sys/devices/pci0000:00/0000:00:1c.5/0000:05:00.0/usb2/2-2" Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 11: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.1/4-1.1.3" Jul 11 12:16:40 svyomo2 mtp-probe: bus: 3, device: 2 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 8 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 6 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 11 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 13 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 9 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: bus: 2, device: 2 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 10: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.2/4-1.2.3" Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 10 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 12: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.2/4-1.2.4" Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 12 was not an MTP device Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 5: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.5" Jul 11 12:16:40 svyomo2 mtp-probe: bus: 4, device: 5 was not an MTP device Jul 11 12:16:40 svyomo2 systemd-fsck[491]: /dev/md0: clean, 332/62248 files, 68882/248820 blocks Jul 11 12:16:40 svyomo2 mtp-probe: checking bus 4, device 7: "/sys/devices/pci0000:00/0000:00:1d.0/usb4/4-1/4-1.7" Jul 11 12:16:40 svyomo2 kernel: [ 0.000000] Initializing cgroup subsys cpuset user.log Jul 5 07:11:04 svyomo2 org.gnome.zeitgeist.Engine[2091]: (zeitgeist-datahub:2315): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 5 07:23:16 svyomo2 org.gnome.zeitgeist.Engine[2406]: (zeitgeist-datahub:2618): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 5 08:33:59 svyomo2 org.gnome.zeitgeist.Engine[2430]: (zeitgeist-datahub:2643): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 5 09:31:08 svyomo2 org.gnome.zeitgeist.Engine[2431]: (zeitgeist-datahub:2627): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 5 12:31:11 svyomo2 org.gnome.zeitgeist.Engine[2433]: (zeitgeist-datahub:2658): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 7 00:08:50 svyomo2 org.gnome.zeitgeist.Engine[2379]: (zeitgeist-daemon:2562): GLib-GObject-CRITICAL **: g_object_unref: assertion 'object->ref_count > 0' failed Jul 7 00:10:55 svyomo2 org.gnome.zeitgeist.Engine[2371]: (zeitgeist-datahub:2595): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 7 20:26:26 svyomo2 org.gnome.zeitgeist.Engine[2441]: (zeitgeist-datahub:2654): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 9 07:07:51 svyomo2 org.gnome.zeitgeist.Engine[3024]: (zeitgeist-datahub:3236): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 9 19:53:40 svyomo2 org.gnome.zeitgeist.Engine[2297]: (zeitgeist-datahub:2516): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 9 20:08:49 svyomo2 org.gnome.zeitgeist.Engine[2638]: (zeitgeist-datahub:2843): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 9 22:30:19 svyomo2 org.gnome.zeitgeist.Engine[2654]: (zeitgeist-datahub:2899): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 10 20:09:25 svyomo2 org.gnome.zeitgeist.Engine[2645]: (zeitgeist-datahub:2864): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 10 21:28:32 svyomo2 org.gnome.zeitgeist.Engine[2649]: (zeitgeist-datahub:2871): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 11 00:32:07 svyomo2 org.gnome.zeitgeist.Engine[2655]: (zeitgeist-datahub:2874): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed Jul 11 12:15:06 svyomo2 org.gnome.zeitgeist.Engine[2263]: (zeitgeist-daemon:2444): GLib-GObject-CRITICAL **: g_object_unref: assertion 'object->ref_count > 0' failed