[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[ 9.586371] rsyslogd (2872) used greatest stack depth: 14496 bytes left [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-next-kasan-gce-4,10.128.15.198' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.157133] BUG: looking up invalid subclass: 8 [ 44.157863] turning off the locking correctness validator. [ 44.158632] CPU: 1 PID: 2998 Comm: syzkaller607485 Not tainted 4.14.0-rc7-next-20171103+ #38 [ 44.159789] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.161008] Call Trace: [ 44.161366] dump_stack+0x194/0x257 [ 44.161854] ? arch_local_irq_restore+0x53/0x53 [ 44.162547] register_lock_class+0x5f2/0x2c70 [ 44.163158] ? __is_insn_slot_addr+0x1fc/0x330 [ 44.163767] ? lock_downgrade+0x990/0x990 [ 44.164365] ? lock_pin_lock+0x370/0x370 [ 44.164908] ? check_usage+0x23d/0xb70 [ 44.165439] ? lock_release+0xd70/0xd70 [ 44.165986] ? is_bpf_text_address+0x7b/0x120 [ 44.166584] ? check_usage_forwards+0x430/0x430 [ 44.167221] ? trace_raw_output_xdp_redirect_map_err+0x440/0x440 [ 44.168031] ? __bfs+0xaa/0x750 [ 44.168511] ? lockdep_on+0x50/0x50 [ 44.169034] ? trace_hardirqs_off+0x10/0x10 [ 44.169633] ? rcutorture_record_progress+0x10/0x10 [ 44.170308] ? print_usage_bug+0x480/0x480 [ 44.170883] ? is_bpf_text_address+0xa4/0x120 [ 44.171519] ? print_usage_bug+0x480/0x480 [ 44.172100] ? check_prev_add+0x31a/0x1580 [ 44.172663] ? check_prev_add+0x31a/0x1580 [ 44.173243] ? copy_trace+0x1d0/0x1d0 [ 44.173751] ? check_usage+0xb70/0xb70 [ 44.174430] ? SOFTIRQ_verbose+0x10/0x10 [ 44.174990] ? save_stack_trace+0x1a/0x20 [ 44.175544] ? save_trace+0x11f/0x350 [ 44.176090] ? print_usage_bug+0x480/0x480 [ 44.176681] ? hlock_class+0x140/0x140 [ 44.177213] __lock_acquire+0x203/0x4770 [ 44.181125] ? __lock_acquire+0x739/0x4770 [ 44.185323] ? print_usage_bug+0x480/0x480 [ 44.189557] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 44.194716] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 44.199871] ? __lock_acquire+0x3374/0x4770 [ 44.204156] ? __lock_acquire+0x3374/0x4770 [ 44.208442] ? __lock_acquire+0x739/0x4770 [ 44.212644] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 44.217805] ? __lock_acquire+0x739/0x4770 [ 44.222009] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 44.227163] ? check_noncircular+0x20/0x20 [ 44.231363] ? check_noncircular+0x20/0x20 [ 44.235562] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 44.240717] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 44.245878] ? check_noncircular+0x20/0x20 [ 44.250081] ? find_held_lock+0x39/0x1d0 [ 44.254108] ? find_held_lock+0x39/0x1d0 [ 44.258136] lock_acquire+0x1d5/0x580 [ 44.261901] ? snd_seq_deliver_event+0x559/0x820 [ 44.266622] ? lock_release+0xd70/0xd70 [ 44.270564] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 44.276415] ? rcu_note_context_switch+0x710/0x710 [ 44.281312] ? __might_sleep+0x95/0x190 [ 44.285250] down_read_nested+0x9a/0x150 [ 44.289275] ? snd_seq_deliver_event+0x559/0x820 [ 44.293992] ? down_read_non_owner+0x40/0x40 [ 44.298364] ? _raw_read_unlock+0x22/0x30 [ 44.302474] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.307107] snd_seq_deliver_event+0x559/0x820 [ 44.311654] ? do_raw_spin_trylock+0x190/0x190 [ 44.316202] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.322654] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 44.327722] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.332706] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.337427] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.342757] dummy_input+0x2c4/0x400 [ 44.346438] ? dummy_free+0x20/0x20 [ 44.350031] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.354663] ? dummy_free+0x20/0x20 [ 44.358255] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 44.364541] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 44.369696] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 44.374594] ? update_timestamp_of_queue+0x14d/0x200 [ 44.379662] snd_seq_deliver_event+0x362/0x820 [ 44.384212] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.390672] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.395655] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.400374] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.405704] dummy_input+0x2c4/0x400 [ 44.409381] ? dummy_free+0x20/0x20 [ 44.413408] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.418043] ? dummy_free+0x20/0x20 [ 44.421634] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 44.427916] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 44.433073] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 44.437969] ? update_timestamp_of_queue+0x14d/0x200 [ 44.443038] snd_seq_deliver_event+0x362/0x820 [ 44.447588] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.454044] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.459024] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.463745] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.469073] dummy_input+0x2c4/0x400 [ 44.472751] ? dummy_free+0x20/0x20 [ 44.476344] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.480976] ? dummy_free+0x20/0x20 [ 44.484574] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 44.490865] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 44.496020] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 44.500916] ? update_timestamp_of_queue+0x14d/0x200 [ 44.505988] snd_seq_deliver_event+0x362/0x820 [ 44.510539] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.517000] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.521984] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.526966] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.532297] dummy_input+0x2c4/0x400 [ 44.535976] ? dummy_free+0x20/0x20 [ 44.539567] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.544204] ? dummy_free+0x20/0x20 [ 44.547796] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 44.554088] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 44.559244] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 44.564151] ? update_timestamp_of_queue+0x14d/0x200 [ 44.569220] snd_seq_deliver_event+0x362/0x820 [ 44.573770] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.580231] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.585212] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.589933] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.595263] dummy_input+0x2c4/0x400 [ 44.598943] ? dummy_free+0x20/0x20 [ 44.602538] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.607171] ? dummy_free+0x20/0x20 [ 44.610766] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 44.617052] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 44.622209] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 44.627103] ? update_timestamp_of_queue+0x14d/0x200 [ 44.632170] snd_seq_deliver_event+0x362/0x820 [ 44.636720] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.643177] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.648160] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.652890] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.658218] dummy_input+0x2c4/0x400 [ 44.661899] ? dummy_free+0x20/0x20 [ 44.665493] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.670148] ? dummy_free+0x20/0x20 [ 44.673741] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 44.680025] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 44.685189] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 44.690085] ? update_timestamp_of_queue+0x14d/0x200 [ 44.695154] snd_seq_deliver_event+0x362/0x820 [ 44.699702] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.706167] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.711148] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.715869] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.721201] dummy_input+0x2c4/0x400 [ 44.724882] ? dummy_free+0x20/0x20 [ 44.728473] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 44.733109] ? dummy_free+0x20/0x20 [ 44.736700] snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 [ 44.742984] ? snd_seq_ioctl_running_mode+0x150/0x150 [ 44.748139] ? snd_seq_client_use_ptr+0x3c/0x330 [ 44.753128] snd_seq_deliver_event+0x176/0x820 [ 44.757678] ? do_raw_spin_trylock+0x190/0x190 [ 44.762227] ? snd_seq_deliver_single_event.constprop.11+0x940/0x940 [ 44.768686] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 44.773754] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.778736] ? trace_hardirqs_on+0xd/0x10 [ 44.782850] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.787571] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 44.792906] snd_seq_oss_midi_reset+0x44b/0x700 [ 44.797540] ? snd_seq_oss_midi_filemode+0xf0/0xf0 [ 44.802436] snd_seq_oss_synth_reset+0x398/0x980 [ 44.807156] ? locks_remove_file+0x3fa/0x5a0 [ 44.811531] ? snd_seq_oss_synth_cleanup+0x400/0x400 [ 44.816601] snd_seq_oss_reset+0x6c/0x260 [ 44.820712] ? free_info_entries+0x36/0x36 [ 44.824913] snd_seq_oss_release+0x71/0x120 [ 44.829206] odev_release+0x52/0x70 [ 44.832805] __fput+0x333/0x7f0 [ 44.836053] ? fput+0x140/0x140 [ 44.839300] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 44.845166] ? _raw_spin_unlock_irq+0x27/0x70 [ 44.849628] ____fput+0x15/0x20 [ 44.852875] task_work_run+0x199/0x270 [ 44.856726] ? task_work_cancel+0x210/0x210 [ 44.861013] ? _raw_spin_unlock+0x22/0x30 [ 44.865125] ? switch_task_namespaces+0x87/0xc0 [ 44.869767] do_exit+0x9b5/0x1ad0 [ 44.873185] ? snd_seq_client_use_ptr+0x85/0x330 [ 44.877906] ? mm_update_next_owner+0x930/0x930 [ 44.882542] ? snd_seq_system_notify+0x11b/0x160 [ 44.887261] ? snd_seq_client_notify_subscription+0x16f/0x210 [ 44.893110] ? snd_seq_dispatch_event+0x5b0/0x5b0 [ 44.897921] ? check_subscription_permission.isra.3+0x11d/0x1d0 [ 44.903942] ? snd_seq_ioctl_subscribe_port+0x1e3/0x2c0 [ 44.909272] ? kasan_check_write+0x14/0x20 [ 44.913469] ? snd_seq_ioctl_unsubscribe_port+0x2c0/0x2c0 [ 44.918971] ? snd_seq_ioctl+0x126/0x400 [ 44.922997] ? snd_seq_open+0x570/0x570 [ 44.926941] ? snd_seq_open+0x570/0x570 [ 44.930881] ? do_vfs_ioctl+0x492/0x1530 [ 44.934911] ? _cond_resched+0x14/0x30 [ 44.938763] ? ioctl_preallocate+0x2b0/0x2b0 [ 44.943137] ? selinux_capable+0x40/0x40 [ 44.947162] ? putname+0xf3/0x130 [ 44.950593] do_group_exit+0x149/0x400 [ 44.954456] ? SyS_exit+0x30/0x30 [ 44.957876] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.962858] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 44.967580] SyS_exit_group+0x1d/0x20 [ 44.971348] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 44.976067] RIP: 0033:0x442c58 [ 44.979223] RSP: 002b:00007ffd7d3be888 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 44.986895] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442c58 [ 44.994129] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 45.001363] RBP: 0000000000000086 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 45.008600] R10: 000000