FYI, we noticed the below changes on https://git.kernel.org/pub/scm/linux/kernel/git/sergeh/linux-security 2016-01-02/cgroupns commit e9a3e09d1af60e945f45a4de6a0e69c2d793a2b5 ("cgroup: introduce cgroup namespaces") +-----------------------------------------------------+------------+------------+ | | f2a74e2f95 | e9a3e09d1a | +-----------------------------------------------------+------------+------------+ | boot_successes | 279 | 0 | | boot_failures | 17 | 8 | | WARNING:at_kernel/trace/ftrace.c:#ftrace_bug() | 13 | | | backtrace:perf_ftrace_event_register | 13 | | | backtrace:perf_trace_init | 13 | | | backtrace:perf_tp_event_init | 13 | | | backtrace:perf_try_init_event | 13 | | | backtrace:SYSC_perf_event_open | 13 | | | backtrace:SyS_perf_event_open | 13 | | | invoked_oom-killer:gfp_mask=0x | 2 | | | Mem-Info | 2 | | | Out_of_memory:Kill_process | 2 | | | backtrace:vfs_write | 2 | | | backtrace:SyS_write | 2 | | | backtrace:do_sys_open | 2 | 8 | | backtrace:SyS_open | 2 | 8 | | backtrace:_do_fork | 2 | 1 | | backtrace:call_usermodehelper_exec_work | 1 | | | backtrace:vfs_read | 2 | | | backtrace:SyS_read | 2 | | | backtrace:iterate_dir | 1 | | | backtrace:SyS_getdents | 1 | | | backtrace:SYSC_newstat | 1 | | | backtrace:SyS_newstat | 1 | | | BUG:kernel_test_oversize | 2 | | | WARNING:at_kernel/cgroup.c:#cset_cgroup_from_root() | 0 | 8 | | backtrace:disk_events_workfn | 0 | 8 | | backtrace:do_mount | 0 | 8 | | backtrace:SyS_mount | 0 | 8 | | backtrace:nilfs_load_super_block | 0 | 1 | | backtrace:init_nilfs | 0 | 2 | | backtrace:do_group_exit | 0 | 4 | | backtrace:SyS_exit_group | 0 | 4 | | backtrace:floppy_work_workfn | 0 | 7 | | backtrace:fd_timer_workfn | 0 | 7 | | backtrace:SyS_clone | 0 | 1 | | backtrace:floppy_shutdown | 0 | 1 | +-----------------------------------------------------+------------+------------+ [ 19.540438] ide-cd: hdc: ATAPI 4X DVD-ROM drive, 512kB Cache [ 19.541746] cdrom: Uniform CD-ROM driver Revision: 3.20 [ 19.563486] ------------[ cut here ]------------ [ 19.564728] WARNING: CPU: 0 PID: 17 at kernel/cgroup.c:1157 cset_cgroup_from_root+0x95/0xaf() [ 19.585876] Modules linked in: [ 19.586889] CPU: 0 PID: 17 Comm: kworker/0:1 Not tainted 4.4.0-rc1-00024-ge9a3e09 #58 [ 19.588876] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 19.591039] Workqueue: events_freezable_power_ disk_events_workfn [ 19.625617] 0000000000000000 ffff88003155b8b8 ffffffff8173d2e1 0000000000000000 [ 19.630088] ffff88003155b8f0 ffffffff810d87a1 ffffffff81154dfb ffffffff84079520 [ 19.632139] ffffffff856510a0 ffffffff856510b0 0000000000000000 ffff88003155b900 [ 19.634262] Call Trace: [ 19.635114] [] dump_stack+0x4b/0x63 [ 19.657228] [] warn_slowpath_common+0x99/0xb2 [ 19.658679] [] ? cset_cgroup_from_root+0x95/0xaf [ 19.660083] [] warn_slowpath_null+0x1a/0x1c [ 19.661424] [] cset_cgroup_from_root+0x95/0xaf [ 19.703860] [] cgroup_path_ns+0x27/0x59 [ 19.705345] [] cgroup_path+0x15/0x17 [ 19.706682] [] blkg_path+0x15/0x4f [ 19.726338] [] cfq_get_queue+0x287/0x305 [ 19.727740] [] ? lock_acquire+0x10a/0x196 [ 19.729046] [] ? lock_acquire+0x10a/0x196 [ 19.730345] [] ? lock_acquired+0xfc/0x2cb [ 19.731680] [] ? cfq_set_request+0x5c/0x29e [ 19.755988] [] cfq_set_request+0x134/0x29e [ 19.757389] [] ? mark_held_locks+0x5e/0x74 [ 19.760761] [] ? _raw_spin_unlock_irq+0x2c/0x3b [ 19.762057] [] ? trace_hardirqs_on_caller+0x17b/0x197 [ 19.763413] [] ? trace_hardirqs_on+0xd/0xf [ 19.782666] [] ? _raw_spin_unlock_irq+0x31/0x3b [ 19.784115] [] elv_set_request+0x1c/0x21 [ 19.785386] [] get_request+0x2ef/0x698 [ 19.786637] [] ? add_wait_queue_exclusive+0x44/0x44 [ 19.788052] [] blk_get_request+0x5b/0x7d [ 19.822922] [] ide_cd_queue_pc+0x76/0x19d [ 19.824240] [] ? __lock_acquire+0x65b/0xdee [ 19.831508] [] cdrom_check_status+0x51/0x53 [ 19.832828] [] ide_cdrom_check_events_real+0x20/0x3f [ 19.834178] [] cdrom_update_events+0x18/0x21 [ 19.860211] [] cdrom_check_events+0x12/0x1f [ 19.861462] [] idecd_check_events+0x1c/0x1e [ 19.862700] [] disk_check_events+0x46/0x103 [ 19.863833] [] disk_events_workfn+0x1c/0x1e [ 19.864966] [] process_one_work+0x24b/0x484 [ 19.866094] [] worker_thread+0x1f5/0x2a7 [ 19.883151] [] ? rescuer_thread+0x289/0x289 [ 19.884397] [] ? rescuer_thread+0x289/0x289 [ 19.885533] [] kthread+0xc5/0xcd [ 19.886525] [] ? kthread_parkme+0x24/0x24 [ 19.887616] [] ret_from_fork+0x3f/0x70 [ 19.909721] [] ? kthread_parkme+0x24/0x24 [ 19.910972] ---[ end trace 8da7b69074db19dd ]--- [ 19.911945] ------------[ cut here ]------------ Thanks, Kernel Test Robot