INIT: Id "2" 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 INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. executing program 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 "2" 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 [ 602.310458] INFO: task syzkaller331196:3824 blocked for more than 120 seconds. [ 602.317945] Not tainted 4.4.115-gaa856bd #7 [ 602.322800] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 602.330790] syzkaller331196 D ffff8800ba77f5d8 27960 3824 3822 0x20020002 [ 602.338272] ffff8800ba77f5d8 0000000000000000 0000000000000000 0000000000000000 [ 602.346277] 0000000000000001 ffff8800ba77f600 ffff8801db21fdb8 ffff8801db21fde0 [ 602.354281] ffff8801db21f4d8 ffffffff84217840 ffff8801c7ac4800 0000000000000000 [ 602.362302] Call Trace: [ 602.365040] [] schedule+0x7a/0x1b0 [ 602.370205] [] schedule_preempt_disabled+0x13/0x20 [ 602.376807] [] mutex_lock_nested+0x306/0x850 [ 602.382978] [] ? snd_seq_do_ioctl+0x15d/0x1b0 [ 602.389122] [] ? __ww_mutex_lock+0x14f0/0x14f0 [ 602.395600] [] ? do_group_exit+0x108/0x320 [ 602.401573] [] ? debug_check_no_obj_freed+0x2d2/0x9b0 [ 602.408397] [] snd_seq_do_ioctl+0x15d/0x1b0 [ 602.414363] [] snd_seq_kernel_client_ctl+0xd7/0x150 [ 602.421060] [] snd_seq_oss_writeq_clear+0xe0/0x140 [ 602.427613] [] ? snd_seq_oss_writeq_wakeup+0xc0/0xc0 [ 602.434429] [] ? kasan_slab_free+0x88/0xc0 [ 602.440483] [] ? kfree+0xfc/0x300 [ 602.445562] [] ? create_port+0x230/0x230 [ 602.451291] [] snd_seq_oss_writeq_delete+0x1f/0x30 [ 602.457857] [] free_devinfo+0x61/0xb0 [ 602.463314] [] port_delete+0xd5/0x110 [ 602.468752] [] snd_seq_delete_port+0x1c3/0x200 [ 602.474998] [] snd_seq_ioctl_delete_port+0xf2/0x1d0 [ 602.481664] [] ? snd_seq_ioctl_set_port_info+0x190/0x190 [ 602.488754] [] ? __ww_mutex_lock_interruptible+0x14d0/0x14d0 [ 602.496208] [] snd_seq_do_ioctl+0x182/0x1b0 [ 602.502179] [] snd_seq_kernel_client_ctl+0xd7/0x150 [ 602.508818] [] ? snd_midi_event_new+0x200/0x200 [ 602.515144] [] snd_seq_event_port_detach+0xaf/0x100 [ 602.521807] [] ? snd_seq_event_port_attach+0x190/0x190 [ 602.528707] [] delete_port+0x73/0xb0 [ 602.534081] [] snd_seq_oss_release+0xe4/0x130 [ 602.540212] [] odev_release+0x52/0x70 [ 602.545740] [] __fput+0x233/0x6d0 [ 602.550849] [] ____fput+0x15/0x20 [ 602.555961] [] task_work_run+0x104/0x180 [ 602.561674] [] do_exit+0x82a/0x2a10 [ 602.566933] [] ? kasan_slab_free+0x88/0xc0 [ 602.572833] [] ? kmem_cache_free+0x197/0x320 [ 602.578875] [] ? release_task+0x1240/0x1240 [ 602.584850] [] ? do_sys_open+0x259/0x660 [ 602.590559] [] ? filp_open+0x70/0x70 [ 602.596047] [] ? __do_page_fault+0x290/0xa00 [ 602.602117] [] do_group_exit+0x108/0x320 [ 602.607805] [] SyS_exit_group+0x1d/0x20 [ 602.613429] [] ? do_group_exit+0x320/0x320 [ 602.619359] [] do_fast_syscall_32+0x314/0x890 [ 602.625536] [] sysenter_flags_fixed+0xd/0x17 [ 602.631646] INFO: lockdep is turned off. [ 602.635714] Sending NMI to all CPUs: [ 602.639694] NMI backtrace for cpu 0 [ 602.643337] CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #7 [ 602.650527] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.659860] task: ffff8800bb0e4800 task.stack: ffff8800bb3b0000 [ 602.665921] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 [ 602.674675] RSP: 0018:ffff8800bb3b7cb8 EFLAGS: 00000046 [ 602.680096] RAX: 0000000003000000 RBX: 0000000000000c00 RCX: ffffffff8126a292 [ 602.687390] RDX: 0000000000000c00 RSI: 0000000000000002 RDI: ffffffffff5fb300 [ 602.694671] RBP: ffff8800bb3b7ce0 R08: 0000000000000001 R09: 0000000000000000 [ 602.701953] R10: 0000000000000000 R11: fffffbfff0ad7e2c R12: 0000000000000246 [ 602.709198] R13: 0000000000000003 R14: ffffffff8426f3a0 R15: 0000000000000002 [ 602.716478] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 602.724709] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.730597] CR2: 00007f26ad9b0000 CR3: 00000001d2486000 CR4: 0000000000160670 [ 602.737841] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.745123] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.752385] Stack: [ 602.754523] ffffffff8426f3a0 ffffffff847ef7c0 fffffbfff08fd9ac dffffc0000000000 [ 602.762069] ffff8801db31bca0 ffff8800bb3b7d00 ffffffff810b99fb ffffffff839f61c0 [ 602.769579] 0000000000000003 ffff8800bb3b7d60 ffffffff81d0ed14 ffffffff8386d4c0 [ 602.777125] Call Trace: [ 602.779681] [] nmi_raise_cpu_backtrace+0x5b/0x70 [ 602.786091] [] nmi_trigger_all_cpu_backtrace+0x4a4/0x550 [ 602.793184] [] ? irq_force_complete_move+0x3b0/0x3b0 [ 602.799918] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 602.807022] [] watchdog+0x6fa/0xae0 [ 602.812292] [] ? watchdog+0xc3/0xae0 [ 602.817647] [] kthread+0x268/0x300 [ 602.822835] [] ? reset_hung_task_detector+0x20/0x20 [ 602.829473] [] ? kthread_create_on_node+0x400/0x400 [ 602.836149] [] ? kthread_create_on_node+0x400/0x400 [ 602.842810] [] ret_from_fork+0x55/0x80 [ 602.848322] [] ? kthread_create_on_node+0x400/0x400 [ 602.855003] 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 [ 602.873993] NMI backtrace for cpu 1 [ 602.877591] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.115-gaa856bd #7 [ 602.884516] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 602.893883] task: ffff8801d9b49800 task.stack: ffff8801d9b58000 [ 602.899914] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 602.908322] RSP: 0018:ffff8801d9b5fd98 EFLAGS: 00000246 [ 602.913766] RAX: 0000000000000003 RBX: ffffffff847dd8c8 RCX: ffffffff81d63b5b [ 602.926530] RDX: 0000000000000004 RSI: ffffffff839fe320 RDI: ffffffff84418180 [ 602.933813] RBP: ffff8801d9b5fd98 R08: 0000000000000000 R09: 0000000000000000 [ 602.941087] R10: 0000000000000000 R11: 1ffff1003b36bf82 R12: 0000000000000001 [ 602.948330] R13: fffffbfff070887c R14: ffffffff847ebc38 R15: 0000000000000000 [ 602.955616] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 602.963840] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 602.969697] CR2: 0000000000f0d000 CR3: 00000000b6650000 CR4: 0000000000160670 [ 602.976966] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 602.984244] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 602.991697] Stack: [ 602.993818] ffff8801d9b5fdd0 ffffffff81027ed5 ffff8801d9b60000 ffffffff847dd8c8 [ 603.001388] fffffbfff070887c ffffffff847ebc38 0000000000000000 ffff8801d9b5fde0 [ 603.008897] ffffffff8102945a ffff8801d9b5fdf8 ffffffff81221468 dffffc0000000000 [ 603.016434] Call Trace: [ 603.019084] [] default_idle+0x55/0x3c0 [ 603.024638] [] arch_cpu_idle+0xa/0x10 [ 603.030060] [] default_idle_call+0x48/0x70 [ 603.035962] [] cpu_startup_entry+0x5fd/0x8f0 [ 603.042012] [] ? call_cpuidle+0xe0/0xe0 [ 603.047614] [] ? clockevents_register_device+0x122/0x230 [ 603.054735] [] start_secondary+0x304/0x3e0 [ 603.060622] [] ? set_cpu_sibling_map+0x1080/0x1080 [ 603.067174] 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 [ 603.086236] Kernel panic - not syncing: hung_task: blocked tasks [ 603.092360] CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.115-gaa856bd #7 [ 603.099518] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 603.108846] 0000000000000000 f7e81e328e658114 ffff8800bb3b7ca8 ffffffff81d03dad [ 603.116818] ffffffff83882f20 ffff8800bb3b7d80 dffffc0000000000 7fffffffffffffff [ 603.124784] ffff8801c7ac4c48 ffff8800bb3b7d70 ffffffff8141acca 0000000041b58ab3 [ 603.132766] Call Trace: [ 603.135383] [] dump_stack+0xc1/0x124 [ 603.140773] [] panic+0x1aa/0x388 [ 603.145771] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 603.152676] [] ? nmi_trigger_all_cpu_backtrace+0x3f8/0x550 [ 603.159919] [] ? nmi_trigger_all_cpu_backtrace+0x3f8/0x550 [ 603.167178] [] watchdog+0x70b/0xae0 [ 603.172429] [] ? watchdog+0xc3/0xae0 [ 603.177763] [] kthread+0x268/0x300 [ 603.182931] [] ? reset_hung_task_detector+0x20/0x20 [ 603.189592] [] ? kthread_create_on_node+0x400/0x400 [ 603.196338] [] ? kthread_create_on_node+0x400/0x400 [ 603.202977] [] ret_from_fork+0x55/0x80 [ 603.208488] [] ? kthread_create_on_node+0x400/0x400 [ 603.215520] Dumping ftrace buffer: [ 603.219029] (ftrace buffer empty) [ 603.222728] Kernel Offset: disabled [ 603.226326] Rebooting in 86400 seconds..