[CRIU] CRIU LXC error

[Andrew Vagin]

On Wed, Feb 12, 2014 at 11:26:25AM +0545, Urgen Sherpa wrote:
> hi,
> the output of reading mountinfo is as follows
> root at ktmnp:/home/nplink# lxc-info -n test-container
> state:   RUNNING
> pid:      4953
> root at ktmnp:/home/nplink# cat /proc/4953/mountinfo
> 131 72 252:0 /var/lib/lxc/test-container/rootfs / rw,relatime - ext4 /dev/
> mapper/ktmnp--vg-root rw,errors=remount-ro,data=ordered
> 132 131 0:65 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw
> 133 131 0:66 / /sys rw,relatime - sysfs sysfs rw
> 134 133 0:17 / /sys/fs/fuse/connections rw,relatime - fusectl none rw
> 135 133 0:6 / /sys/kernel/debug rw,relatime - debugfs none rw
> 136 133 0:10 / /sys/kernel/security rw,relatime - securityfs none rw
> 137 133 0:22 / /sys/fs/pstore rw,relatime - pstore none rw
> 73 131 0:67 / /dev/pts rw,relatime - devpts devpts rw,gid=5,mode=620,ptmxmode=
> 666
> 74 131 0:67 /ptmx /dev/ptmx rw,relatime - devpts devpts rw,gid=5,mode=
> 620,ptmxmode=666
> 75 133 0:68 / /sys/fs/cgroup rw,relatime - tmpfs none rw,size=4k,mode=755
> 76 131 0:69 / /run rw,nosuid,noexec,relatime - tmpfs none rw,size=49484k,mode=
> 755
> 77 76 0:70 / /run/lock rw,nosuid,nodev,noexec,relatime - tmpfs none rw,size=
> 5120k
> 78 76 0:71 / /run/shm rw,nosuid,nodev,relatime - tmpfs none rw
> 79 76 0:72 / /run/user rw,nosuid,nodev,noexec,relatime - tmpfs none rw,size=
> 102400k,mode=755
> 
> with reference to https://help.ubuntu.com/lts/serverguide/lxc.html#
> lxc-installation I stopped and started container with with this..
> 
> #lxc-start -n test-container -f /var/lib/lxc/test-container/config
> heres what /var/lib/lxc/test-container/config looks like.
> #cat config
> 
> lxc.console = none
> lxc.network.type = veth
> lxc.network.hwaddr = 00:16:3e:b3:f5:95
> lxc.network.flags = up
> lxc.network.link = lxcbr0
> lxc.rootfs = /var/lib/lxc/test-container/rootfs
> lxc.mount = /var/lib/lxc/test-container/fstab
> lxc.pivotdir = lxc_putold
> lxc.devttydir = lxc
> lxc.tty = 0
> lxc.pts = 1024
> lxc.utsname = test-containerq
> lxc.arch = amd64
> lxc.cap.drop = sys_module mac_admin mac_override sys_time
> lxc.cgroup.memory.limit_in_bytes = 1994M
> 
> lxc.cgroup.devices.deny = a
> lxc.cgroup.devices.allow = c *:* m
> lxc.cgroup.devices.allow = b *:* m
> lxc.cgroup.devices.allow = c 1:3 rwm
> lxc.cgroup.devices.allow = c 1:5 rwm
> lxc.cgroup.devices.allow = c 5:1 rwm

This line allows to use /dev/console. Could you try to remove it and dump CT?

> lxc.cgroup.devices.allow = c 5:0 rwm
> lxc.cgroup.devices.allow = c 1:9 rwm
> lxc.cgroup.devices.allow = c 1:8 rwm
> lxc.cgroup.devices.allow = c 136:* rwm
> lxc.cgroup.devices.allow = c 5:2 rwm
> lxc.cgroup.devices.allow = c 254:0 rm
> lxc.cgroup.devices.allow = c 10:229 rwm
> lxc.cgroup.devices.allow = c 10:200 rwm
> lxc.cgroup.devices.allow = c 1:7 rwm
> lxc.cgroup.devices.allow = c 10:228 rwm
> lxc.cgroup.devices.allow = c 10:232 rwm
> 
> 
> Below is my kernel config
> 
> #vim /boot/config-3.11.0-12-generic
> ...
> ,,,,
> ...
> # Character devices
> #
> CONFIG_TTY=y
> CONFIG_VT=y
> CONFIG_CONSOLE_TRANSLATIONS=y
> CONFIG_VT_CONSOLE=y
> CONFIG_VT_CONSOLE_SLEEP=y
> CONFIG_HW_CONSOLE=y
> CONFIG_VT_HW_CONSOLE_BINDING=y
> CONFIG_UNIX98_PTYS=y
> CONFIG_DEVPTS_MULTIPLE_INSTANCES=y
> CONFIG_LEGACY_PTYS=y
> CONFIG_LEGACY_PTY_COUNT=0
> CONFIG_SERIAL_NONSTANDARD=y
> CONFIG_ROCKETPORT=m
> CONFIG_CYCLADES=m
> ....
> ...
> 
> Thankyou gentlemen
> 
> 
> 
> On Tue, Feb 11, 2014 at 7:02 PM, Andrew Vagin <avagin at parallels.com> wrote:
> 
>     On Tue, Feb 11, 2014 at 04:47:34PM +0400, Cyrill Gorcunov wrote:
>     > On Tue, Feb 11, 2014 at 04:26:09PM +0400, Cyrill Gorcunov wrote:
>     > > On Tue, Feb 11, 2014 at 05:32:46PM +0545, Urgen Sherpa wrote:
>     > > >    /usr/lib/locale/C.UTF-8/LC_CTYPE (path inode=2883985)
>     > > >    getty   2700 root    0u   CHR    5,1      0t0  937203 /dev/console
>     > > >    getty   2700 root    1u   CHR    5,1      0t0  937203 /dev/console
>     > > >    getty   2700 root    2u   CHR    5,1      0t0  937203 /dev/console
>     > >
>     > > Aha! So we're trying to dump /dev/console. I guess it's VT terminal,
>     > > which has no "fetch index" operation. Need to think how to resolve it,
>     > > thanks for report!
>     >
>     > Urgen, are you sure that you've set lxc.console = none and lxc.tty = 0 ?
>     > The presense of /dev/console here with getty over it makes me thing
>     > that lcx either not read your config, or you need to restart lcx
>     container
>     > probably.
> 
>     Probaly this CT uses devtmpfs, which isn't virtualized.
> 
>     # cat /proc/pid/mountinfo
> 
>     Which processes in CT have opened /dev/console?
> 
>     >
>     > Also, do you have
>     >
>     > CONFIG_DEVPTS_MULTIPLE_INSTANCES=y
>     >
>     > in your kernel config?
>     >
>     >       Cyrill
> 
>