INIT: Id "6" 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 "1" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. executing program INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes [ 602.292174] INFO: task syzkaller020638:3882 blocked for more than 120 seconds. [ 602.299554] Not tainted 4.4.115-gaa856bd #6 [ 602.304410] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 602.312469] syzkaller020638 D ffff8800ba4cf648 27976 3882 3880 0x00000002 [ 602.319995] ffff8800ba4cf648 0000000000000000 0000000000000000 0000000000000000 [ 602.328106] 0000000000000001 ffff8800ba4cf600 ffff8801db31fdb8 ffff8801db31fde0 [ 602.336111] ffff8801db31f4d8 ffff8801d9b49800 ffff8801d7f29800 0000000000000000 [ 602.344110] Call Trace: [ 602.346765] [] schedule+0x7a/0x1b0 [ 602.351931] [] schedule_preempt_disabled+0x13/0x20 [ 602.358522] [] mutex_lock_nested+0x306/0x850 [ 602.364623] [] ? snd_seq_do_ioctl+0x15d/0x1b0 [ 602.370745] [] ? __ww_mutex_lock+0x14f0/0x14f0 [ 602.377015] [] ? do_exit+0x82a/0x2a10 [ 602.382487] [] ? __module_text_address+0x13/0x140 [ 602.389067] [] ? debug_check_no_obj_freed+0x2d2/0x9b0 [ 602.395924] [] snd_seq_do_ioctl+0x15d/0x1b0 [ 602.401872] [] snd_seq_kernel_client_ctl+0xd7/0x150 [ 602.408585] [] snd_seq_oss_writeq_clear+0xe0/0x140 [ 602.415256] [] ? snd_seq_oss_writeq_wakeup+0xc0/0xc0 [ 602.422023] [] ? kasan_slab_free+0x88/0xc0 [ 602.427947] [] ? kfree+0xfc/0x300 [ 602.433116] [] ? create_port+0x230/0x230 [ 602.438819] [] snd_seq_oss_writeq_delete+0x1f/0x30 [ 602.445404] [] free_devinfo+0x61/0xb0 [ 602.450838] [] port_delete+0xd5/0x110 [ 602.456292] [] snd_seq_delete_port+0x1c3/0x200 [ 602.462519] [] snd_seq_ioctl_delete_port+0xf2/0x1d0 [ 602.469160] [] ? snd_seq_ioctl_set_port_info+0x190/0x190 [ 602.476261] [] snd_seq_do_ioctl+0x182/0x1b0 [ 602.482234] [] snd_seq_kernel_client_ctl+0xd7/0x150 [ 602.488884] [] ? snd_midi_event_new+0x200/0x200 [ 602.495300] [] snd_seq_event_port_detach+0xaf/0x100 [ 602.501958] [] ? snd_seq_event_port_attach+0x190/0x190 [ 602.508905] [] ? __ww_mutex_lock+0x14f0/0x14f0 [ 602.515201] [] ? fsnotify+0x5ad/0xee0 [ 602.520630] [] delete_port+0x73/0xb0 [ 602.525999] [] snd_seq_oss_release+0xe4/0x130 [ 602.532142] [] odev_release+0x52/0x70 [ 602.537597] [] __fput+0x233/0x6d0 [ 602.542702] [] ____fput+0x15/0x20 [ 602.547808] [] task_work_run+0x104/0x180 [ 602.553540] [] do_exit+0x82a/0x2a10 [ 602.558791] [] ? kasan_slab_free+0x88/0xc0 [ 602.564678] [] ? kmem_cache_free+0x197/0x320 [ 602.570717] [] ? release_task+0x1240/0x1240 [ 602.576692] [] ? do_sys_open+0x259/0x660 [ 602.582401] [] ? filp_open+0x70/0x70 [ 602.587787] [] ? __do_page_fault+0x380/0xa00 [ 602.593846] [] do_group_exit+0x108/0x320 [ 602.599541] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 602.606058] [] SyS_exit_group+0x1d/0x20 [ 602.611758] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 602.618383] INFO: lockdep is turned off. [ 602.622440] Sending NMI to all CPUs: [ 602.627353] NMI backtrace for cpu 0 [ 602.630955] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.115-gaa856bd #6 [ 602.637886] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.647231] task: ffffffff84217840 task.stack: ffffffff84200000 [ 602.653279] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 602.661663] RSP: 0018:ffffffff84207dc0 EFLAGS: 00000246 [ 602.667127] RAX: 0000000000000003 RBX: ffffffff847dd8c8 RCX: ffffffff81d63b5b [ 602.674390] RDX: 0000000000000004 RSI: ffffffff839fe320 RDI: ffffffff84418180 [ 602.681637] RBP: ffffffff84207dc0 R08: 0000000000000000 R09: 0000000000000000 [ 602.688910] R10: 0000000000000000 R11: 1ffffffff0840f86 R12: 0000000000000000 [ 602.696173] R13: fffffbfff070887c R14: ffffffff847ebc38 R15: 0000000000000000 [ 602.703442] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 602.711643] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.717539] CR2: 0000000000afe000 CR3: 00000000b0fd0000 CR4: 0000000000160670 [ 602.724807] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.732078] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.739326] Stack: [ 602.741443] ffffffff84207df8 ffffffff81027ed5 ffffffff84208000 ffffffff847dd8c8 [ 602.748984] fffffbfff070887c ffffffff847ebc38 0000000000000000 ffffffff84207e08 [ 602.756517] ffffffff8102945a ffffffff84207e20 ffffffff81221468 dffffc0000000000 [ 602.764316] Call Trace: [ 602.766873] [] default_idle+0x55/0x3c0 [ 602.772410] [] arch_cpu_idle+0xa/0x10 [ 602.777829] [] default_idle_call+0x48/0x70 [ 602.783714] [] cpu_startup_entry+0x5fd/0x8f0 [ 602.789744] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 602.796672] [] ? call_cpuidle+0xe0/0xe0 [ 602.802297] [] rest_init+0x189/0x190 [ 602.807724] [] start_kernel+0x6b9/0x6ee [ 602.813375] [] ? thread_stack_cache_init+0xb/0xb [ 602.819764] [] ? early_idt_handler_array+0x120/0x120 [ 602.826538] [] ? early_idt_handler_array+0x120/0x120 [ 602.833301] [] x86_64_start_reservations+0x2a/0x2c [ 602.839854] [] x86_64_start_kernel+0x140/0x163 [ 602.846093] 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 [ 602.865094] NMI backtrace for cpu 1 [ 602.868698] CPU: 1 PID: 485 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #6 [ 602.875907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.885319] task: ffff8800bac56000 task.stack: ffff8800bac28000 [ 602.891362] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 [ 602.900143] RSP: 0018:ffff8800bac2fcb8 EFLAGS: 00000046 [ 602.905590] RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a292 [ 602.912872] RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300 [ 602.920119] RBP: ffff8800bac2fce0 R08: 0000000000000001 R09: 0000000000000000 [ 602.927404] R10: 0000000000000000 R11: fffffbfff0ad7e2c R12: 0000000000000246 [ 602.934671] R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002 [ 602.941922] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 602.950160] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.956043] CR2: 00007f6e33087000 CR3: 00000001c680e000 CR4: 0000000000160670 [ 602.963317] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.970561] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.977851] Stack: [ 602.979971] ffffffff8426f3a0 ffffffff847ef7c0 fffffbfff08fd9ac dffffc0000000000 [ 602.987507] ffff8801db31bca0 ffff8800bac2fd00 ffffffff810b99fb ffffffff839f61c0 [ 602.995043] 0000000000000003 ffff8800bac2fd60 ffffffff81d0ed14 0000000000000001 [ 603.002579] Call Trace: [ 603.005134] [] nmi_raise_cpu_backtrace+0x5b/0x70 [ 603.011507] [] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 [ 603.018635] [] ? irq_force_complete_move+0x3b0/0x3b0 [ 603.025389] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 603.032402] [] watchdog+0x6fa/0xae0 [ 603.037652] [] ? watchdog+0xc3/0xae0 [ 603.043028] [] kthread+0x268/0x300 [ 603.048191] [] ? reset_hung_task_detector+0x20/0x20 [ 603.054874] [] ? kthread_create_on_node+0x400/0x400 [ 603.061524] [] ? kthread_create_on_node+0x400/0x400 [ 603.068218] [] ret_from_fork+0x55/0x80 [ 603.073769] [] ? kthread_create_on_node+0x400/0x400 [ 603.080412] 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 [ 603.099470] Kernel panic - not syncing: hung_task: blocked tasks [ 603.105595] CPU: 1 PID: 485 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #6 [ 603.112751] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 603.122074] 0000000000000000 2ec05eececebee83 ffff8800bac2fca8 ffffffff81d03dad [ 603.130046] ffffffff83882f20 ffff8800bac2fd80 dffffc0000000000 7fffffffffffffff [ 603.138011] ffff8801d7f29c48 ffff8800bac2fd70 ffffffff8141acca 0000000041b58ab3 [ 603.145982] Call Trace: [ 603.148605] [] dump_stack+0xc1/0x124 [ 603.153968] [] panic+0x1aa/0x388 [ 603.158957] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 603.165856] [] ? nmi_trigger_all_cpu_backtrace+0x3f8/0x550 [ 603.173102] [] ? nmi_trigger_all_cpu_backtrace+0x3f8/0x550 [ 603.180356] [] watchdog+0x70b/0xae0 [ 603.185603] [] ? watchdog+0xc3/0xae0 [ 603.190941] [] kthread+0x268/0x300 [ 603.196105] [] ? reset_hung_task_detector+0x20/0x20 [ 603.202753] [] ? kthread_create_on_node+0x400/0x400 [ 603.209478] [] ? kthread_create_on_node+0x400/0x400 [ 603.216127] [] ret_from_fork+0x55/0x80 [ 603.221633] [] ? kthread_create_on_node+0x400/0x400 [ 603.228654] Dumping ftrace buffer: [ 603.232163] (ftrace buffer empty) [ 603.235845] Kernel Offset: disabled [ 603.239442] Rebooting in 86400 seconds..