Comment 10 for bug 1231778

[ 59.264921] type=1400 audit(1380291018.856:28): apparmor="STATUS" info="failed to unpack profile" error=-71 pid=781 comm="apparmor_parser" name="/usr/lib/NetworkManager/nm-dhcp-client.action" offset=155

this line from dmesg looks very suspicious ... adding "apparmor.enable=0" to the kernel cmdline (to diable apparmor completely) might help