[lxc-devel] Unable to launch a LXC container

[Hemavathi Lakkalapudi]

Hello All,


I am trying to run openWRT Chaos Calmer 15.05 with Malta in a LXC container
on MIPS based CPE.


Generated openWRT image with default configuration for MIPS target to run
in the container.


I created a container name maltab under /lxc and placed into the files
directory so it get integrated into the main GW image.



On GW image, LXC and its dependency packages are selected , image is
generated with maltab container and loaded on to the DUT. I can see
config,fstab and rootfs files under maltab .

When I tried to start the container, I am getting the following error. I
didn't do lxc-create as container is present under /lxc/maltab


lxc-start: sync.c: __sync_wait: 51 invalid sequence number 1. expected 2

lxc-start: start.c: __lxc_start: 1192 failed to spawn 'maltabe'

lxc-start: lxc_start.c: main: 344 The container failed to start.



I suspected issues with seccomp and then disabled seccomp package and
verified. Now the container is started with following errors. Please help
me to resolve these issues.






 #######################################################################################################

root at ugwcpe:~# lxc-start  -n maltabe -F  -P /lxc  -o /lxc/test6.log -l trace

[   94.850000] device vethRIQKWJ entered promiscuous mode

[   94.850000] IPv6: ADDRCONF(NETDEV_UP): vethRIQKWJ: link is not ready

[   94.860000] br0: port 1(vethRIQKWJ) entered forwarding state

[   94.870000] br0: port 1(vethRIQKWJ) entered forwarding state

[   94.870000] br0: port 1(vethRIQKWJ) entered disabled state

[   95.100000] IPv6: ADDRCONF(NETDEV_CHANGE): vethRIQKWJ: link becomes ready

[   95.110000] br0: port 1(vethRIQKWJ) entered forwarding state

[   95.110000] br0: port 1(vethRIQKWJ) entered forwarding state

Press the [f] key and hit [enter] to enter failsafe mode

Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level

[   99.540000] i2c-lantiq 16a00000.i2c: setup clocks (in 200000000 kHz, bus
100000 kHz,rmc =20 dec=50 10000000)

[  100.040000] i2c-lantiq 16a00000.i2c: setup clocks (in 200000000 kHz, bus
100000 kHz,rmc =20 dec=50 10000000)

[  100.790000] UBI error: ubi_open_volume: cannot open device 0, volume 8,
error -16

Dec  2 14:31:15 udevd[5749]: failed to execute '/sbin/blkid' '/sbin/blkid
-o udev -p /dev/loop1': No such file or directory



Dec  2 14:31:15 udevd[5748]: failed to execute '/sbin/blkid' '/sbin/blkid
-o udev -p /dev/loop0': No such file or directory



Dec  2 14:31:15 udevd[5752]: failed to execute '/sbin/blkid' '/sbin/blkid
-o udev -p /dev/ram0': No such file or directory



Please press Enter to activate this console.



[  105.380000] overlayfs: ERROR - failed to whiteout '02-network'

[  105.460000] overlayfs: ERROR - failed to whiteout '10_migrate-shadow'

[  105.470000] overlayfs: ERROR - failed to whiteout '11_migrate-sysctl'

[  105.560000] overlayfs: ERROR - failed to whiteout
'12_network-generate-ula'

[  105.610000] overlayfs: ERROR - failed to whiteout '20_migrate-feeds'

[  107.060000] br0: port 1(vethRIQKWJ) entered disabled state

[  107.080000] br0: port 1(vethRIQKWJ) entered forwarding state

[  107.080000] br0: port 1(vethRIQKWJ) entered forwarding state



 #############################################################



When I check trace6.log file, the following error are observed but
container seems to be started.



lxc_cgfs - cgfs.c:do_setup_cgroup_limits:1922 - cgroup 'devices.allow' set
to '

lxc_cgfs - cgfs.c:do_setup_cgroup_limits:1926 - cgroup has been setup

lxc_seccomp - seccomp.c:use_seccomp:527 - Seccomp is not enabled in the
kernel

lxc_start - start.c:start:1274 - exec'ing '/sbin/init'

lxc_start - start.c:post_start:1285 - '/sbin/init' started with pid '10135'

lxc_start - start.c:signal_handler:312 - invalid pid for SIGCHLD

lxc_start - start.c:signal_handler:316 - container init process exited

lxc_start - start.c:__lxc_start:1220 - Container halting

lxc_start - start.c:__lxc_start:1235 - Pushing physical nics back to host
names

lxc_start - start.c:__lxc_start:1238 - Tearing down virtual network devices
use

lxc_conf - conf.c:lxc_delete_network:3114 - failed to remove interface
'(null)'

lxc_error - error.c:lxc_error_set_and_log:55 - child <10135> ended on
signal (2

lxc_conf - conf.c:lxc_delete_network:3114 - failed to remove interface
'(null)'

#################################################################

The following issues are observed

·       lxc-ls gives information about running containers . This is not
working currently.

·       lxc-console command is not working as it doesn’t have information
about running containers.



Kindly please help me to resolve the above issues.

Regards,

Hema
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