INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. executing program INIT: Id "5" 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 "1" 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 [ 602.214441] INFO: task syzkaller589832:3782 blocked for more than 120 seconds. [ 602.221828] Not tainted 4.4.115-gaa856bd #6 [ 602.226763] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 602.234723] syzkaller589832 D ffff8800ba48f7a8 27240 3782 3780 0x00000000 [ 602.242205] ffff8800ba48f7a8 0000000000000000 0000000000000000 0000000000000000 [ 602.250206] 0000000000000001 ffff8800ba48f700 ffff8801db31fdb8 ffff8801db31fde0 [ 602.258219] ffff8801db31f4d8 ffff8801d9b49800 ffff8801d8f06000 0000000000000000 [ 602.266231] Call Trace: [ 602.268864] [] schedule+0x7a/0x1b0 [ 602.274026] [] schedule_preempt_disabled+0x13/0x20 [ 602.280626] [] mutex_lock_nested+0x306/0x850 [ 602.286705] [] ? snd_seq_do_ioctl+0x15d/0x1b0 [ 602.292823] [] ? __ww_mutex_lock+0x14f0/0x14f0 [ 602.299066] [] ? exit_to_usermode_loop+0x13d/0x160 [ 602.305674] [] ? debug_check_no_obj_freed+0x2d2/0x9b0 [ 602.312488] [] snd_seq_do_ioctl+0x15d/0x1b0 [ 602.318471] [] snd_seq_kernel_client_ctl+0xd7/0x150 [ 602.325152] [] snd_seq_oss_writeq_clear+0xe0/0x140 [ 602.331706] [] ? snd_seq_oss_writeq_wakeup+0xc0/0xc0 [ 602.338476] [] ? kasan_slab_free+0x88/0xc0 [ 602.344378] [] ? kfree+0xfc/0x300 [ 602.349456] [] ? create_port+0x230/0x230 [ 602.355214] [] snd_seq_oss_writeq_delete+0x1f/0x30 [ 602.361779] [] free_devinfo+0x61/0xb0 [ 602.367234] [] port_delete+0xd5/0x110 [ 602.372662] [] snd_seq_delete_port+0x1c3/0x200 [ 602.378896] [] snd_seq_ioctl_delete_port+0xf2/0x1d0 [ 602.385553] [] ? snd_seq_ioctl_set_port_info+0x190/0x190 [ 602.392637] [] snd_seq_do_ioctl+0x182/0x1b0 [ 602.398607] [] snd_seq_kernel_client_ctl+0xd7/0x150 [ 602.405269] [] ? snd_midi_event_new+0x200/0x200 [ 602.411562] [] snd_seq_event_port_detach+0xaf/0x100 [ 602.418232] [] ? snd_seq_event_port_attach+0x190/0x190 [ 602.425156] [] ? __ww_mutex_lock+0x14f0/0x14f0 [ 602.431414] [] ? fsnotify+0x5ad/0xee0 [ 602.436864] [] delete_port+0x73/0xb0 [ 602.442202] [] snd_seq_oss_release+0xe4/0x130 [ 602.448350] [] odev_release+0x52/0x70 [ 602.453798] [] __fput+0x233/0x6d0 [ 602.458906] [] ____fput+0x15/0x20 [ 602.464007] [] task_work_run+0x104/0x180 [ 602.469726] [] exit_to_usermode_loop+0x13d/0x160 [ 602.476309] [] syscall_return_slowpath+0x1b5/0x1f0 [ 602.482867] [] int_ret_from_sys_call+0x25/0xa3 [ 602.489151] INFO: lockdep is turned off. [ 602.493183] Sending NMI to all CPUs: [ 602.498146] NMI backtrace for cpu 0 [ 602.501753] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.115-gaa856bd #6 [ 602.508687] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.518036] task: ffffffff84217840 task.stack: ffffffff84200000 [ 602.524064] RIP: 0010:[] [] sched_clock_tick+0x6/0x120 [ 602.532555] RSP: 0018:ffffffff84207dc0 EFLAGS: 00000046 [ 602.537997] RAX: 0000000000000001 RBX: ffff8801db219c40 RCX: ffffffff812d51d6 [ 602.545265] RDX: 0000000000000000 RSI: ffff8801db219c40 RDI: ffffffff847ebd14 [ 602.552523] RBP: ffffffff84207dc8 R08: ffff88021fffd018 R09: 000000000000000a [ 602.559800] R10: ffffed0043fffa01 R11: 0000000000000000 R12: 0000008bf6e3bc5d [ 602.567062] R13: ffff8801db219cd0 R14: 0000008bf6e3bc5d R15: ffffffff84208000 [ 602.574317] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 602.582550] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.588439] CR2: 00007f4f4e271000 CR3: 00000001cc32e000 CR4: 0000000000160670 [ 602.595707] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.602951] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.610244] Stack: [ 602.612368] ffffffff811d4202 ffffffff84207de8 ffffffff812d573b ffff8801db219c40 [ 602.619904] ffff8801db219cb4 ffffffff84207e20 ffffffff812d793f ffffffff84207e10 [ 602.627434] dffffc0000000000 ffffffff847dd8c8 fffffbfff070887c ffffffff847ebc38 [ 602.634965] Call Trace: [ 602.637521] [] ? sched_clock_idle_wakeup_event+0x42/0x50 [ 602.644625] [] tick_nohz_stop_idle+0x5b/0x70 [ 602.650655] [] tick_nohz_idle_exit+0x2cf/0x3d0 [ 602.656895] [] cpu_startup_entry+0x2a5/0x8f0 [ 602.662924] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 602.669855] [] ? call_cpuidle+0xe0/0xe0 [ 602.675476] [] rest_init+0x189/0x190 [ 602.680821] [] start_kernel+0x6b9/0x6ee [ 602.686439] [] ? thread_stack_cache_init+0xb/0xb [ 602.692815] [] ? early_idt_handler_array+0x120/0x120 [ 602.699578] [] ? early_idt_handler_array+0x120/0x120 [ 602.706328] [] x86_64_start_reservations+0x2a/0x2c [ 602.712880] [] x86_64_start_kernel+0x140/0x163 [ 602.719109] Code: c0 7f 0e 65 8b 3d 93 20 e4 7e e8 c6 fd ff ff 5d c3 e8 af 20 e5 ff 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 8b 05 da e1 84 03 <85> c0 0f 8f b9 00 00 00 8b 05 d8 7b 61 03 85 c0 0f 84 ab 00 00 [ 602.738113] NMI backtrace for cpu 1 [ 602.741711] CPU: 1 PID: 485 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #6 [ 602.748897] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.758244] task: ffff8800bac90000 task.stack: ffff8800bace0000 [ 602.764275] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 [ 602.773022] RSP: 0018:ffff8800bace7cb8 EFLAGS: 00000046 [ 602.778459] RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a292 [ 602.785728] RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300 [ 602.792975] RBP: ffff8800bace7ce0 R08: 0000000000000001 R09: 0000000000000000 [ 602.800254] R10: 0000000000000000 R11: fffffbfff0ad7e2c R12: 0000000000000246 [ 602.807527] R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002 [ 602.814799] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 602.822999] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.828885] CR2: 00000000020d2000 CR3: 00000001cc32e000 CR4: 0000000000160670 [ 602.836143] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.843395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.850667] Stack: [ 602.852787] ffffffff8426f3a0 ffffffff847ef7c0 fffffbfff08fd9ac dffffc0000000000 [ 602.860316] ffff8801db31bca0 ffff8800bace7d00 ffffffff810b99fb ffffffff839f61c0 [ 602.867841] 0000000000000003 ffff8800bace7d60 ffffffff81d0ed14 0000000000000001 [ 602.875367] Call Trace: [ 602.877921] [] nmi_raise_cpu_backtrace+0x5b/0x70 [ 602.884297] [] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 [ 602.891400] [] ? irq_force_complete_move+0x3b0/0x3b0 [ 602.898140] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 602.905151] [] watchdog+0x6fa/0xae0 [ 602.910404] [] ? watchdog+0xc3/0xae0 [ 602.915764] [] kthread+0x268/0x300 [ 602.920926] [] ? reset_hung_task_detector+0x20/0x20 [ 602.927594] [] ? kthread_create_on_node+0x400/0x400 [ 602.934229] [] ? kthread_create_on_node+0x400/0x400 [ 602.940900] [] ret_from_fork+0x55/0x80 [ 602.946423] [] ? kthread_create_on_node+0x400/0x400 [ 602.953064] 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 0b 2f 17 00 4c 89 e7 57 9d 0f 1f [ 602.972107] Kernel panic - not syncing: hung_task: blocked tasks [ 602.978230] CPU: 1 PID: 485 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #6 [ 602.985385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.994708] 0000000000000000 ed88ea8a703f300a ffff8800bace7ca8 ffffffff81d03dad [ 603.002680] ffffffff83882f20 ffff8800bace7d80 dffffc0000000000 7fffffffffffffff [ 603.010649] ffff8801d8f06448 ffff8800bace7d70 ffffffff8141acca 0000000041b58ab3 [ 603.018900] Call Trace: [ 603.021606] [] dump_stack+0xc1/0x124 [ 603.026962] [] panic+0x1aa/0x388 [ 603.031952] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 603.038847] [] ? nmi_trigger_all_cpu_backtrace+0x3f8/0x550 [ 603.046091] [] ? nmi_trigger_all_cpu_backtrace+0x3f8/0x550 [ 603.053334] [] watchdog+0x70b/0xae0 [ 603.058580] [] ? watchdog+0xc3/0xae0 [ 603.063914] [] kthread+0x268/0x300 [ 603.069073] [] ? reset_hung_task_detector+0x20/0x20 [ 603.075707] [] ? kthread_create_on_node+0x400/0x400 [ 603.082353] [] ? kthread_create_on_node+0x400/0x400 [ 603.088989] [] ret_from_fork+0x55/0x80 [ 603.094496] [] ? kthread_create_on_node+0x400/0x400 [ 603.101520] Dumping ftrace buffer: [ 603.105028] (ftrace buffer empty) [ 603.108711] Kernel Offset: disabled [ 603.112308] Rebooting in 86400 seconds..