Unity 8 crash after "click Continue"

[vasilisc]

1) Login into Unity 8
2) Click twice Continue
3) Get graphical artifact - see http://itmages.ru/image/view/2108138/b2645840
4) keyboard and mouse show that the computer is not hangup
5) Reboot PC with Alt + SysRq + R,E,I,S,U,B

sorry for my english
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Thu, 11 Dec 2014 09:03:25 +0300
[Ubuntu]
Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04

[Kernel linux]
Linux vasilisc 3.16.0-25-generic #33-Ubuntu SMP Tue Nov 4 12:06:54 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[Kernel command line]
BOOT_IMAGE=/vmlinuz-3.16.0-25-generic root=UUID=6d8ea6da-b2d9-406c-a812-2b21a2925731 ro rootflags=subvol=@ ipv6.disable=1 elevator=noop

xserver-xorg-video-nouveau:
  Installed: 1:1.0.11-1ubuntu2
  Candidate: 1:1.0.11-1ubuntu2
  Version table:
 *** 1:1.0.11-1ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

unity8-lxc:
  Installed: 1.0.2-0~46~ubuntu15.04.1
  Candidate: 1.0.2-0~46~ubuntu15.04.1
  Version table:
 *** 1.0.2-0~46~ubuntu15.04.1 0
        500 http://ppa.launchpad.net/unity8-desktop-session-team/unity8-preview-lxc/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status
     1.0.1+15.04.20141121-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages

[vasilisc (vasilisc)]

Dec 24 09:28:20 unity8-lxc kernel: [ 6783.171193] show_signal_msg: 4 callbacks suppressed
Dec 24 09:28:21 unity8-lxc kernel: [ 6784.120095] unity8-dash[11139]: segfault at 0 ip 00007f4de3a83221 sp 00007fff50d153a0 error 4 in libunity-scopes.so.0.6.10[7f4de38da000+25a000]
Dec 24 09:28:23 unity8-lxc kernel: [ 6786.901043] unity8-dash[11203]: segfault at 0 ip 00007f021e741221 sp 00007fff4cc06fe0 error 4 in libunity-scopes.so.0.6.10[7f021e598000+25a000]
Dec 24 09:28:24 unity8-lxc ntpdate[1151]: Can't adjust the time of day: Operation not permitted
Dec 24 09:28:26 unity8-lxc kernel: [ 6789.684503] unity8-dash[11269]: segfault at 0 ip 00007fd5ae966221 sp 00007fff8edfb300 error 4 in libunity-scopes.so.0.6.10[7fd5ae7bd000+25a000]
Dec 24 09:28:27 unity8-lxc kernel: [ 6790.603494] unity8-dash[11289]: segfault at 0 ip 00007f7cd6baa221 sp 00007fff10966eb0 error 4 in libunity-scopes.so.0.6.10[7f7cd6a01000+25a000]
Dec 24 09:28:28 unity8-lxc kernel: [ 6791.515130] unity8-dash[11309]: segfault at 0 ip 00007fd6d4cd6221 sp 00007fff2b532a80 error 4 in libunity-scopes.so.0.6.10[7fd6d4b2d000+25a000]
Dec 24 09:28:31 unity8-lxc kernel: [ 6794.525586] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: GPPTR PBPTR SIGNATURE
Dec 24 09:28:31 unity8-lxc kernel: [ 6794.525592] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 17 [Mir/IPC[10791]] subc 0 mthd 0x0000 data 0x00000000
Dec 24 09:28:31 unity8-lxc kernel: [ 6794.525663] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: SIGNATURE
Dec 24 09:28:31 unity8-lxc kernel: [ 6794.525665] nouveau E[ PFIFO][0000:01:00.0] PBDMA0: ch 17 [Mir/IPC[10791]] subc 0 mthd 0x0008 data 0x14523691
Dec 24 09:28:31 unity8-lxc kernel: [ 6794.525687] nouveau E[ PFIFO][0000:01:00.0] read fault at 0xa0d801a000 [VA_LIMIT_VIOLATION] from PBDMA0/HOST on channel 0x007ed30000 [unknown]
Dec 24 09:28:34 unity8-lxc NetworkManager[302]: <info> (eth0): IP6 addrconf timed out or failed.