lxd - container wont start due to fork error

# lxc start test-centos-6 

error: Error calling 'lxd forkstart test-centos-6 /var/lib/lxd/containers /var/log/lxd/test-centos-6/lxc.conf': err='exit status 1'
Try `lxc info --show-log test-centos-6` for more info

Check the logs

# lxc info --show-log test-centos-6 | egrep "ERROR"
            lxc 1447352472.614 ERROR    lxc_utils - utils.c:setproctitle:1461 - Invalid argument - setting cmdline failed
            lxc 1447352472.675 ERROR    lxc_sync - sync.c:__sync_wake:62 - sync wake failure : Broken pipe
            lxc 1447352472.675 ERROR    lxc_start - start.c:__lxc_start:1192 - failed to spawn 'test-centos-6'

Basically, i had set the max memory for the container to 4GB.
with

lxc config set test-centos-6 limits.memory 4096

Only thing it is in bytes not MB
This fixes it.

lxc config set test-centos-6 limits.memory 4096000000

Check the container once started

# lxc start test-centos-6

# lxc exec test-centos-6 /bin/bash

[root@test-centos-6 ~]# free -g
             total       used       free     shared    buffers     cached
Mem:             3          0          3          0          0          0
-/+ buffers/cache:          0          3 
Swap:            7          0          7