bad: scheduling while atomic!
Call Trace:
 [<c01166b2>] schedule+0x3d2/0x3e0
 [<c0116a18>] wait_for_completion+0x78/0xd0
 [<c0116710>] default_wake_function+0x0/0x30
 [<c0116710>] default_wake_function+0x0/0x30
 [<c015eda8>] link_path_walk+0x828/0x8d0
 [<c0129c71>] synchronize_kernel+0x31/0x40
 [<c01d0fdb>] poke_blanked_console+0x6b/0x80
 [<c0129c30>] wakeme_after_rcu+0x0/0x10
 [<c016c55d>] detach_mnt+0x3d/0x70
 [<c016d623>] do_move_mount+0x213/0x250
 [<c011a34e>] __call_console_drivers+0x5e/0x60
 [<c011a435>] call_console_drivers+0x65/0x120
 [<c016d99b>] do_mount+0xeb/0x180
 [<c0197220>] __copy_from_user_ll+0x70/0x80
 [<c016d8a0>] copy_mount_options+0xe0/0xf0
 [<c016df0f>] sys_mount+0xbf/0x140
 [<c0374de9>] prepare_namespace+0x49/0xc0
 [<c01050a4>] init+0x34/0x1c0
 [<c0105070>] init+0x0/0x1c0
 [<c0107289>] kernel_thread_helper+0x5/0xc