INIT: Entering runlevel: 2

[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?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-kasan-gce-9,10.128.15.202' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   33.993931] BUG: looking up invalid subclass: 8
[   33.994672] turning off the locking correctness validator.
[   33.995542] CPU: 1 PID: 2991 Comm: syzkaller370690 Not tainted 4.14.0-rc8+ #164
[   33.996565] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.997785] Call Trace:
[   33.998142]  dump_stack+0x194/0x257
[   33.998628]  ? arch_local_irq_restore+0x53/0x53
[   33.999252]  register_lock_class+0x5f2/0x2c70
[   33.999861]  ? lock_pin_lock+0x360/0x360
[   34.000405]  ? noop_count+0x40/0x40
[   34.000891]  ? trace_hardirqs_off+0x10/0x10
[   34.001467]  ? __is_insn_slot_addr+0x1fc/0x330
[   34.002091]  ? lock_downgrade+0x990/0x990
[   34.002643]  ? lock_release+0xa40/0xa40
[   34.003174]  ? __is_insn_slot_addr+0x1fc/0x330
[   34.003792]  ? check_usage+0x23d/0xb70
[   34.004314]  ? lock_release+0xa40/0xa40
[   34.004843]  ? bpf_prog_kallsyms_find+0xbd/0x440
[   34.005476]  ? print_irqtrace_events+0x270/0x270
[   34.006106]  ? is_bpf_text_address+0x7b/0x120
[   34.006702]  ? __bfs+0xaa/0x750
[   34.007143]  ? lock_release+0xa40/0xa40
[   34.007672]  ? lockdep_on+0x50/0x50
[   34.008157]  ? trace_hardirqs_off+0x10/0x10
[   34.008731]  ? rcutorture_record_progress+0x10/0x10
[   34.009411]  ? print_irqtrace_events+0x270/0x270
[   34.010039]  ? is_bpf_text_address+0xa4/0x120
[   34.010636]  ? kernel_text_address+0x102/0x140
[   34.011245]  ? hlock_class+0x140/0x140
[   34.011765]  ? __kernel_text_address+0xd/0x40
[   34.012369]  __lock_acquire+0x224/0x3d50
[   34.012925]  ? __lock_acquire+0x6aa/0x3d50
[   34.013491]  ? snd_seq_deliver_event+0x27f/0x790
[   34.014170]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   34.019324]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   34.024476]  ? __lock_acquire+0x3173/0x3d50
[   34.028762]  ? __lock_acquire+0x6aa/0x3d50
[   34.032967]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   34.038121]  ? __lock_acquire+0x6aa/0x3d50
[   34.042322]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   34.047479]  ? check_noncircular+0x20/0x20
[   34.051678]  ? check_noncircular+0x20/0x20
[   34.055878]  ? check_noncircular+0x20/0x20
[   34.060086]  ? __lock_acquire+0x3173/0x3d50
[   34.064377]  ? __lock_acquire+0x6aa/0x3d50
[   34.068581]  lock_acquire+0x1d5/0x580
[   34.072344]  ? lock_acquire+0x1d5/0x580
[   34.076280]  ? snd_seq_deliver_event+0x27f/0x790
[   34.081001]  ? lock_release+0xa40/0xa40
[   34.084947]  ? check_same_owner+0x320/0x320
[   34.089232]  ? lock_release+0xa40/0xa40
[   34.093171]  ? __might_sleep+0x95/0x190
[   34.097108]  down_read_nested+0x9a/0x150
[   34.101134]  ? snd_seq_deliver_event+0x27f/0x790
[   34.105854]  ? down_read_non_owner+0x40/0x40
[   34.110227]  ? _raw_read_unlock+0x22/0x30
[   34.114339]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.118973]  snd_seq_deliver_event+0x27f/0x790
[   34.123520]  ? do_raw_spin_trylock+0x190/0x190
[   34.128066]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.134527]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   34.139595]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.144574]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.149381]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.154709]  dummy_input+0x2c4/0x400
[   34.158386]  ? dummy_free+0x20/0x20
[   34.161976]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.166607]  ? dummy_free+0x20/0x20
[   34.170198]  snd_seq_deliver_single_event.constprop.11+0x2fb/0x940
[   34.176484]  ? snd_seq_ioctl_running_mode+0x150/0x150
[   34.181637]  ? snd_seq_timer_get_cur_tick+0xd/0x40
[   34.186530]  ? update_timestamp_of_queue+0x14d/0x200
[   34.191600]  snd_seq_deliver_event+0x31e/0x790
[   34.196150]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.202609]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.207589]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.212310]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.217638]  dummy_input+0x2c4/0x400
[   34.221317]  ? dummy_free+0x20/0x20
[   34.224910]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.229542]  ? dummy_free+0x20/0x20
[   34.233139]  snd_seq_deliver_single_event.constprop.11+0x2fb/0x940
[   34.239424]  ? snd_seq_ioctl_running_mode+0x150/0x150
[   34.244580]  ? snd_seq_timer_get_cur_tick+0xd/0x40
[   34.249475]  ? update_timestamp_of_queue+0x14d/0x200
[   34.254542]  snd_seq_deliver_event+0x31e/0x790
[   34.259092]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.265547]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.270534]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.275259]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.280593]  dummy_input+0x2c4/0x400
[   34.284287]  ? dummy_free+0x20/0x20
[   34.287883]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.292515]  ? dummy_free+0x20/0x20
[   34.296110]  snd_seq_deliver_single_event.constprop.11+0x2fb/0x940
[   34.302395]  ? snd_seq_ioctl_running_mode+0x150/0x150
[   34.307548]  ? snd_seq_timer_get_cur_tick+0xd/0x40
[   34.312450]  ? update_timestamp_of_queue+0x14d/0x200
[   34.317521]  snd_seq_deliver_event+0x31e/0x790
[   34.322076]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.328535]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.333517]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.338242]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.343570]  dummy_input+0x2c4/0x400
[   34.347247]  ? dummy_free+0x20/0x20
[   34.350837]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.355467]  ? dummy_free+0x20/0x20
[   34.359059]  snd_seq_deliver_single_event.constprop.11+0x2fb/0x940
[   34.365342]  ? snd_seq_ioctl_running_mode+0x150/0x150
[   34.370497]  ? snd_seq_timer_get_cur_tick+0xd/0x40
[   34.375391]  ? update_timestamp_of_queue+0x14d/0x200
[   34.380461]  snd_seq_deliver_event+0x31e/0x790
[   34.385010]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.391468]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.396450]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.401170]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.406499]  dummy_input+0x2c4/0x400
[   34.410177]  ? dummy_free+0x20/0x20
[   34.413767]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.418400]  ? dummy_free+0x20/0x20
[   34.421990]  snd_seq_deliver_single_event.constprop.11+0x2fb/0x940
[   34.428284]  ? snd_seq_ioctl_running_mode+0x150/0x150
[   34.433448]  ? snd_seq_timer_get_cur_tick+0xd/0x40
[   34.438341]  ? update_timestamp_of_queue+0x14d/0x200
[   34.443416]  snd_seq_deliver_event+0x31e/0x790
[   34.447965]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.455274]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.460260]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.464980]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.470315]  dummy_input+0x2c4/0x400
[   34.473993]  ? dummy_free+0x20/0x20
[   34.477583]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.482214]  ? dummy_free+0x20/0x20
[   34.485824]  snd_seq_deliver_single_event.constprop.11+0x2fb/0x940
[   34.492106]  ? snd_seq_ioctl_running_mode+0x150/0x150
[   34.497258]  ? snd_seq_timer_get_cur_tick+0xd/0x40
[   34.502151]  ? update_timestamp_of_queue+0x14d/0x200
[   34.507221]  snd_seq_deliver_event+0x31e/0x790
[   34.511769]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.518225]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.523215]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.527943]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.533271]  dummy_input+0x2c4/0x400
[   34.536948]  ? dummy_free+0x20/0x20
[   34.540542]  ? snd_seq_port_use_ptr+0x12d/0x1c0
[   34.545173]  ? dummy_free+0x20/0x20
[   34.548767]  snd_seq_deliver_single_event.constprop.11+0x2fb/0x940
[   34.555056]  ? snd_seq_ioctl_running_mode+0x150/0x150
[   34.560222]  ? snd_seq_client_use_ptr+0x80/0x330
[   34.564944]  snd_seq_deliver_event+0x12c/0x790
[   34.569491]  ? do_raw_spin_trylock+0x190/0x190
[   34.574039]  ? lock_downgrade+0x950/0x990
[   34.578151]  ? snd_seq_deliver_single_event.constprop.11+0x940/0x940
[   34.584610]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   34.589676]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.594658]  ? trace_hardirqs_on+0xd/0x10
[   34.598770]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.603492]  snd_seq_kernel_client_dispatch+0x11e/0x150
[   34.608824]  snd_seq_oss_midi_reset+0x44b/0x700
[   34.613457]  ? snd_seq_oss_midi_filemode+0xf0/0xf0
[   34.618351]  snd_seq_oss_synth_reset+0x398/0x980
[   34.623071]  ? locks_remove_file+0x3fa/0x5a0
[   34.627443]  ? snd_seq_oss_synth_cleanup+0x400/0x400
[   34.632518]  ? __fsnotify_parent+0xb4/0x3a0
[   34.636803]  snd_seq_oss_reset+0x6c/0x260
[   34.640922]  ? free_info_entries+0x36/0x36
[   34.645117]  snd_seq_oss_release+0x71/0x120
[   34.649401]  odev_release+0x52/0x70
[   34.652992]  __fput+0x327/0x7e0
[   34.656236]  ? fput+0x140/0x140
[   34.659483]  ? check_same_owner+0x320/0x320
[   34.663766]  ? _raw_spin_unlock_irq+0x27/0x70
[   34.668245]  ____fput+0x15/0x20
[   34.671491]  task_work_run+0x199/0x270
[   34.675344]  ? task_work_cancel+0x210/0x210
[   34.679637]  ? _raw_spin_unlock+0x22/0x30
[   34.683748]  ? switch_task_namespaces+0x87/0xc0
[   34.688382]  do_exit+0x9b5/0x1ad0
[   34.691799]  ? snd_seq_client_use_ptr+0x85/0x330
[   34.696520]  ? mm_update_next_owner+0x930/0x930
[   34.701160]  ? snd_seq_system_notify+0x11b/0x160
[   34.705879]  ? snd_seq_client_notify_subscription+0x16f/0x210
[   34.711728]  ? snd_seq_dispatch_event+0x5b0/0x5b0
[   34.716533]  ? check_subscription_permission.isra.3+0x11d/0x1d0
[   34.722555]  ? snd_seq_ioctl_subscribe_port+0x1e3/0x2c0
[   34.727884]  ? kasan_check_write+0x14/0x20
[   34.732082]  ? snd_seq_ioctl_unsubscribe_port+0x2c0/0x2c0
[   34.737591]  ? snd_seq_ioctl+0x126/0x400
[   34.741615]  ? snd_seq_open+0x570/0x570
[   34.745559]  ? snd_seq_open+0x570/0x570
[   34.749496]  ? do_vfs_ioctl+0x486/0x1520
[   34.753524]  ? ioctl_preallocate+0x2b0/0x2b0
[   34.757899]  ? selinux_capable+0x40/0x40
[   34.761925]  ? putname+0xf3/0x130
[   34.765341]  do_group_exit+0x149/0x400
[   34.769195]  ? SyS_exit+0x30/0x30
[   34.772617]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.777599]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   34.782317]  SyS_exit_group+0x1d/0x20
[   34.786081]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   34.790798] RIP: 0033:0x442c58
[   34.793951] RSP: 002b:00007ffdaf8554a