INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes [ 601.891737] INFO: task syzkaller001243:3402 blocked for more than 120 seconds. [ 601.899145] Not tainted 4.4.107-g610c835 #12 [ 601.904116] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 601.912384] syzkaller001243 D ffff8801cfd16bf8 24552 3402 3400 0x00000002 [ 601.919851] ffff8801cfd16bf8 dffffc0000000000 ffff8800b37e8870 ffff8801cfd16bd8 [ 601.927849] ffffffff8123364f ffff8800b37e8800 ffff8801db21f878 ffff8801db21f8a0 [ 601.935835] ffff8801db21ef98 ffff8801cff45f00 ffff8800b37e8000 ffff8801cfd10000 [ 601.943866] Call Trace: [ 601.946597] [] ? mark_held_locks+0xaf/0x100 [ 601.952662] [] schedule+0x9a/0x1c0 [ 601.957828] [] ? rwsem_down_read_failed+0x1ba/0x300 [ 601.964509] [] rwsem_down_read_failed+0x1bf/0x300 [ 601.970972] [] ? rt_mutex_futex_unlock+0x10/0x10 [ 601.977470] [] call_rwsem_down_read_failed+0x14/0x30 [ 601.984245] [] ? down_read_nested+0x56/0x60 [ 601.990273] [] ? snd_seq_deliver_event+0x4d5/0x740 [ 601.996843] [] snd_seq_deliver_event+0x4d5/0x740 [ 602.003232] [] ? snd_seq_deliver_single_event.constprop.11+0x7c0/0x7c0 [ 602.011521] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.018439] [] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 602.025646] [] dummy_input+0x235/0x320 [ 602.031148] [] ? dummy_free+0x20/0x20 [ 602.036589] [] ? _raw_read_unlock+0x2c/0x50 [ 602.042542] [] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 602.048998] [] ? dummy_free+0x20/0x20 [ 602.054434] [] snd_seq_deliver_single_event.constprop.11+0x310/0x7c0 [ 602.062569] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 602.069470] [] ? snd_seq_ioctl_running_mode+0x170/0x170 [ 602.076477] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.083390] [] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 602.090116] [] ? update_timestamp_of_queue+0x14d/0x200 [ 602.097034] [] snd_seq_deliver_event+0x316/0x740 [ 602.103430] [] ? snd_seq_deliver_single_event.constprop.11+0x7c0/0x7c0 [ 602.111747] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.118643] [] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 602.125826] [] dummy_input+0x235/0x320 [ 602.131331] [] ? dummy_free+0x20/0x20 [ 602.136774] [] ? _raw_read_unlock+0x2c/0x50 [ 602.142738] [] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 602.149198] [] ? dummy_free+0x20/0x20 [ 602.154648] [] snd_seq_deliver_single_event.constprop.11+0x310/0x7c0 [ 602.162794] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 602.169688] [] ? snd_seq_ioctl_running_mode+0x170/0x170 [ 602.176697] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.183612] [] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 602.190331] [] ? update_timestamp_of_queue+0x14d/0x200 [ 602.197253] [] snd_seq_deliver_event+0x316/0x740 [ 602.203652] [] ? snd_seq_deliver_single_event.constprop.11+0x7c0/0x7c0 [ 602.211958] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.218855] [] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 602.226040] [] dummy_input+0x235/0x320 [ 602.231544] [] ? dummy_free+0x20/0x20 [ 602.236987] [] ? _raw_read_unlock+0x2c/0x50 [ 602.242954] [] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 602.249418] [] ? dummy_free+0x20/0x20 [ 602.254871] [] snd_seq_deliver_single_event.constprop.11+0x310/0x7c0 [ 602.263002] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 602.269894] [] ? snd_seq_ioctl_running_mode+0x170/0x170 [ 602.276911] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.283826] [] ? snd_seq_timer_get_cur_tick+0xd/0x40 [ 602.290546] [] ? update_timestamp_of_queue+0x14d/0x200 [ 602.297458] [] snd_seq_deliver_event+0x316/0x740 [ 602.303852] [] ? snd_seq_deliver_single_event.constprop.11+0x7c0/0x7c0 [ 602.312154] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.319054] [] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 602.326233] [] dummy_input+0x235/0x320 [ 602.331760] [] ? dummy_free+0x20/0x20 [ 602.337177] [] ? _raw_read_unlock+0x2c/0x50 [ 602.343137] [] ? snd_seq_port_use_ptr+0x12d/0x1c0 [ 602.349596] [] ? dummy_free+0x20/0x20 [ 602.355037] [] snd_seq_deliver_single_event.constprop.11+0x310/0x7c0 [ 602.363174] [] ? snd_seq_ioctl_running_mode+0x170/0x170 [ 602.370154] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 602.377156] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 602.384157] [] snd_seq_deliver_event+0x12d/0x740 [ 602.390527] [] ? mark_held_locks+0xaf/0x100 [ 602.396482] [] ? snd_seq_deliver_single_event.constprop.11+0x7c0/0x7c0 [ 602.404788] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 602.411621] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 602.418514] [] snd_seq_kernel_client_dispatch+0x11e/0x150 [ 602.425686] [] snd_seq_oss_midi_reset+0x390/0x570 [ 602.432169] [] ? snd_seq_oss_midi_filemode+0xf0/0xf0 [ 602.438893] [] snd_seq_oss_synth_reset+0x3c0/0x8b0 [ 602.445460] [] ? snd_seq_oss_synth_cleanup+0x400/0x400 [ 602.452385] [] ? mutex_lock_nested+0x560/0x850 [ 602.458592] [] ? odev_release+0x4a/0x70 [ 602.464212] [] ? __ww_mutex_lock+0x14f0/0x14f0 [ 602.470491] [] ? fsnotify+0x5ad/0xee0 [ 602.475932] [] ? snd_midi_event_new+0x200/0x200 [ 602.482229] [] snd_seq_oss_reset+0x6c/0x260 [ 602.488169] [] ? snd_midi_event_new+0x200/0x200 [ 602.494472] [] snd_seq_oss_release+0x71/0x130 [ 602.501280] [] odev_release+0x52/0x70 [ 602.506767] [] __fput+0x233/0x6d0 [ 602.511854] [] ____fput+0x15/0x20 [ 602.516977] [] task_work_run+0x104/0x180 [ 602.522689] [] do_exit+0x871/0x2a20 [ 602.527936] [] ? release_task+0x1240/0x1240 [ 602.533924] [] ? __do_page_fault+0x380/0xa00 [ 602.539949] [] do_group_exit+0x108/0x320 [ 602.545691] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 602.552179] [] SyS_exit_group+0x1d/0x20 [ 602.557772] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 602.564451] 5 locks held by syzkaller001243/3402: [ 602.569262] #0: (register_mutex#4){+.+.+.}, at: [] odev_release+0x4a/0x70 [ 602.578697] #1: (&grp->list_mutex#2/2){.+.+..}, at: [] snd_seq_deliver_event+0x4d5/0x740 [ 602.589460] #2: (&grp->list_mutex#2/3){.+.+..}, at: [] snd_seq_deliver_event+0x4d5/0x740 [ 602.600212] #3: (&grp->list_mutex#2/4){.+.+..}, at: [] snd_seq_deliver_event+0x4d5/0x740 [ 602.610978] #4: (&grp->list_mutex#2/5){.+.+..}, at: [] snd_seq_deliver_event+0x4d5/0x740 [ 602.621758] Sending NMI to all CPUs: [ 602.625827] NMI backtrace for cpu 0 [ 602.629424] CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.107-g610c835 #12 [ 602.636694] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.646033] task: ffff8800bb220000 task.stack: ffff8800bac10000 [ 602.652077] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 [ 602.660794] RSP: 0018:ffff8800bac17cb8 EFLAGS: 00000046 [ 602.666245] RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000 [ 602.673510] RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300 [ 602.680752] RBP: ffff8800bac17ce0 R08: 0000000000000001 R09: 0000000000000000 [ 602.688048] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246 [ 602.695329] R13: 0000000000000003 R14: ffffffff8426abe0 R15: 0000000000000002 [ 602.702591] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 602.710789] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.716664] CR2: 00007f58ddb3a000 CR3: 00000001d4022000 CR4: 00000000001406f0 [ 602.723922] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.731164] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.738418] Stack: [ 602.740534] ffffffff8426abe0 ffffffff847e8600 00000000000194a0 0000000000000040 [ 602.748055] dffffc0000000000 ffff8800bac17d00 ffffffff810b8e1b ffffffff839f53e0 [ 602.755589] 0000000000000003 ffff8800bac17d60 ffffffff81d0f4d7 ffffffff81417c73 [ 602.763130] Call Trace: [ 602.765688] [] nmi_raise_cpu_backtrace+0x5b/0x70 [ 602.772085] [] nmi_trigger_all_cpu_backtrace+0x4a7/0x550 [ 602.779154] [] ? print_lock+0xab/0xae [ 602.784597] [] ? irq_force_complete_move+0x3b0/0x3b0 [ 602.791313] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 602.798310] [] watchdog+0x6fa/0xae0 [ 602.803566] [] ? watchdog+0xc3/0xae0 [ 602.808897] [] kthread+0x268/0x300 [ 602.814076] [] ? reset_hung_task_detector+0x20/0x20 [ 602.820706] [] ? kthread_create_on_node+0x400/0x400 [ 602.827367] [] ? kthread_create_on_node+0x400/0x400 [ 602.834017] [] ret_from_fork+0x3f/0x70 [ 602.839527] [] ? kthread_create_on_node+0x400/0x400 [ 602.846188] Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 3b 09 17 00 4c 89 e7 57 9d 0f 1f [ 602.865327] NMI backtrace for cpu 1 [ 602.868918] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.107-g610c835 #12 [ 602.875924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.885628] task: ffff8801da2997c0 task.stack: ffff8801da2a8000 [ 602.891685] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 602.900053] RSP: 0018:ffff8801da2afd78 EFLAGS: 00000246 [ 602.905489] RAX: 0000000000000007 RBX: ffffffff847d6708 RCX: 0000000000000000 [ 602.912756] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801da29a02c [ 602.919994] RBP: ffff8801da2afd78 R08: 0000000000000000 R09: 0000000000000000 [ 602.927256] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 602.934513] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 [ 602.941785] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 602.949979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.955855] CR2: 000000000207a000 CR3: 00000001d4022000 CR4: 00000000001406e0 [ 602.963127] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.970366] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.977635] Stack: [ 602.979757] ffff8801da2afdb0 ffffffff81027d75 ffff8801da2b0000 ffffffff847d6708 [ 602.987273] 0000000000000000 0000000000000000 dffffc0000000000 ffff8801da2afdc0 [ 602.994784] ffffffff810292ea ffff8801da2afdd8 ffffffff8121e338 ffff8801da2b0000 [ 603.002306] Call Trace: [ 603.004853] [] default_idle+0x55/0x3c0 [ 603.010352] [] arch_cpu_idle+0xa/0x10 [ 603.015786] [] default_idle_call+0x48/0x70 [ 603.021743] [] cpu_startup_entry+0x605/0x820 [ 603.027770] [] ? call_cpuidle+0xe0/0xe0 [ 603.033377] [] ? clockevents_register_device+0x122/0x230 [ 603.040447] [] start_secondary+0x304/0x3e0 [ 603.046322] [] ? set_cpu_sibling_map+0x1040/0x1040 [ 603.052893] Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84 [ 603.072133] Kernel panic - not syncing: hung_task: blocked tasks [ 603.078260] CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.107-g610c835 #12 [ 603.085495] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 603.094821] 0000000000000000 497caf77946db68b ffff8800bac17ca8 ffffffff81d0457d [ 603.102777] ffffffff83881e80 ffff8800bac17d80 dffffc0000000000 7fffffffffffffff [ 603.110722] ffff8800b37e83e8 ffff8800bac17d70 ffffffff8141774a 0000000041b58ab3 [ 603.118663] Call Trace: [ 603.121217] [] dump_stack+0xc1/0x124 [ 603.126553] [] panic+0x1aa/0x388 [ 603.131535] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 603.138428] [] ? nmi_trigger_all_cpu_backtrace+0x3fb/0x550 [ 603.145669] [] ? nmi_trigger_all_cpu_backtrace+0x3fb/0x550 [ 603.152912] [] watchdog+0x70b/0xae0 [ 603.158161] [] ? watchdog+0xc3/0xae0 [ 603.163492] [] kthread+0x268/0x300 [ 603.168649] [] ? reset_hung_task_detector+0x20/0x20 [ 603.175279] [] ? kthread_create_on_node+0x400/0x400 [ 603.181909] [] ? kthread_create_on_node+0x400/0x400 [ 603.188539] [] ret_from_fork+0x3f/0x70 [ 603.194050] [] ? kthread_create_on_node+0x400/0x400 [ 603.200805] Dumping ftrace buffer: [ 603.204342] (ftrace buffer empty) [ 603.208019] Kernel Offset: disabled [ 603.211621] Rebooting in 86400 seconds..