[ 36.517074] 4 locks held by kworker/u4:1/19: [ 36.521451] #0: ("%s""netns"){.+.+.+}, at: [] process_one_work+0x17e/0x690 [ 36.530802] #1: (net_cleanup_work){+.+.+.}, at: [] process_one_work+0x17e/0x690 [ 36.540560] #2: (net_mutex){+.+.+.}, at: [] cleanup_net+0x7a/0x270 [ 36.549190] #3: (&(&nf_conntrack_locks[i])->rlock){+.....}, at: [] nf_conntrack_lock+0xd/0x50 [ 36.560180] [ 36.560180] stack backtrace: [ 36.564654] CPU: 1 PID: 19 Comm: kworker/u4:1 Not tainted 4.5.0-rc3-syzkaller #0 [ 36.572166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.581504] Workqueue: netns cleanup_net [ 36.585651] 0000000000000000 ffff88012b007b20 ffffffff81882ab0 ffffffff83c07ed0 [ 36.593633] ffffffff83c07ed0 ffff88012b007bf8 ffffffff811c045c ffff88012b000500 [ 36.601613] ffffffff825d615c 000000000004df40 0000000000000000 ffff88012b007b60 [ 36.609612] Call Trace: [ 36.612173] [] dump_stack+0x99/0xd9 [ 36.617420] [] __lock_acquire+0x1a5c/0x1ba0 [ 36.623373] [] ? _raw_spin_unlock_irqrestore+0x4c/0x90 [ 36.630304] [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 36.637028] [] ? free_one_page+0x34/0x3e0 [ 36.642795] [] lock_acquire+0xed/0x210 [ 36.648310] [] ? nf_conntrack_lock+0xd/0x50 [ 36.654261] [] _raw_spin_lock+0x36/0x50 [ 36.659872] [] ? nf_conntrack_lock+0xd/0x50 [ 36.665821] [] nf_conntrack_lock+0xd/0x50 [ 36.671589] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 36.677875] [] cttimeout_net_exit+0x28/0x80 [ 36.683860] [] ops_exit_list.isra.4+0x33/0x60 [ 36.690085] [] cleanup_net+0x1a9/0x270 [ 36.695626] [] process_one_work+0x21b/0x690 [ 36.701580] [] ? process_one_work+0x17e/0x690 [ 36.707697] [] worker_thread+0x49/0x490 [ 36.713295] [] ? process_one_work+0x690/0x690 [ 36.719425] [] kthread+0xea/0x100 [ 36.724504] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 36.731175] [] ret_from_fork+0x3f/0x70 [ 36.736683] [] ? kthread_create_on_node+0x1f0/0x1f0 Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts. 2019/11/26 19:25:51 parsed 1 programs 2019/11/26 19:25:52 executed programs: 0 [ 41.887507] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 41.896689] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 41.904520] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 41.913650] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 41.922441] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 41.929104] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 140.428557] BUG: spinlock lockup suspected on CPU#1, kworker/u4:1/19 [ 140.435087] lock: nf_conntrack_locks+0x0/0xe000, .magic: dead4ead, .owner: kworker/u4:1/19, .owner_cpu: 1 [ 140.444899] CPU: 1 PID: 19 Comm: kworker/u4:1 Not tainted 4.5.0-rc3-syzkaller #0 [ 140.452426] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 140.461758] Workqueue: netns cleanup_net [ 140.465906] 0000000000000000 ffff88012b007c18 ffffffff81882ab0 ffff88012b000500 [ 140.473897] ffffffff8300a780 ffff88012b007c38 ffffffff811c4953 ffffffff8300a780 [ 140.481878] 0000000089173700 ffff88012b007c68 ffffffff811c4a83 ffffffff8300a780 [ 140.489999] Call Trace: [ 140.492555] [] dump_stack+0x99/0xd9 [ 140.497803] [] spin_dump+0x73/0xc0 [ 140.502962] [] do_raw_spin_lock+0xa3/0x160 [ 140.508932] [] _raw_spin_lock+0x3e/0x50 [ 140.514573] [] ? nf_conntrack_lock+0xd/0x50 [ 140.520512] [] nf_conntrack_lock+0xd/0x50 [ 140.526311] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 140.532599] [] cttimeout_net_exit+0x28/0x80 [ 140.538541] [] ops_exit_list.isra.4+0x33/0x60 [ 140.544656] [] cleanup_net+0x1a9/0x270 [ 140.550162] [] process_one_work+0x21b/0x690 [ 140.556120] [] ? process_one_work+0x17e/0x690 [ 140.562233] [] worker_thread+0x49/0x490 [ 140.567834] [] ? process_one_work+0x690/0x690 [ 140.573947] [] kthread+0xea/0x100 [ 140.579022] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 140.585657] [] ret_from_fork+0x3f/0x70 [ 140.591174] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 140.597828] Sending NMI to all CPUs: [ 140.601612] NMI backtrace for cpu 0 [ 140.605208] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc3-syzkaller #0 [ 140.612441] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 140.621802] task: ffffffff83021540 ti: ffffffff83000000 task.ti: ffffffff83000000 [ 140.629410] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 140.637794] RSP: 0018:ffffffff83003eb8 EFLAGS: 00000282 [ 140.643226] RAX: 0000000000000000 RBX: ffffffff83000000 RCX: 0000000000000000 [ 140.650512] RDX: 0000000000000000 RSI: ffffffff82d21be2 RDI: ffffffff81089bf6 [ 140.657759] RBP: ffffffff83003eb8 R08: 0000000000000000 R09: 0000000000000001 [ 140.665043] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83004000 [ 140.672296] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff83000000 [ 140.679537] FS: 0000000000000000(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 [ 140.687743] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 140.693608] CR2: 000000c420457e80 CR3: 00000000af899000 CR4: 00000000001406f0 [ 140.700860] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 140.708142] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 140.715515] Stack: [ 140.717639] ffffffff83003ed8 ffffffff81089c09 ffffffff83000000 ffffffff83004000 [ 140.725150] ffffffff83003ee8 ffffffff8108a61a ffffffff83003ef8 ffffffff811b8145 [ 140.732660] ffffffff83003f40 ffffffff811b853f ffffffff8336b2e0 ffffffff83004000 [ 140.740171] Call Trace: [ 140.742729] [] default_idle+0x29/0x190 [ 140.748234] [] arch_cpu_idle+0xa/0x10 [ 140.753935] [] default_idle_call+0x25/0x50 [ 140.759800] [] cpu_startup_entry+0x3cf/0x460 [ 140.765841] [] rest_init+0x131/0x140 [ 140.771184] [] start_kernel+0x44a/0x457 [ 140.776778] [] ? early_idt_handler_array+0x120/0x120 [ 140.783505] [] x86_64_start_reservations+0x2a/0x2c [ 140.790164] [] x86_64_start_kernel+0x145/0x152 [ 140.796373] 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 [ 140.815540] NMI backtrace for cpu 1 [ 140.819141] CPU: 1 PID: 19 Comm: kworker/u4:1 Not tainted 4.5.0-rc3-syzkaller #0 [ 140.826658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 140.835998] Workqueue: netns cleanup_net [ 140.840077] task: ffff88012b000500 ti: ffff88012b004000 task.ti: ffff88012b004000 [ 140.847706] RIP: 0010:[] [] native_write_msr_safe+0x6/0x40 [ 140.856524] RSP: 0018:ffff88012b007b68 EFLAGS: 00000086 [ 140.861954] RAX: 0000000000000400 RBX: ffffffff8324d4c0 RCX: 0000000000000830 [ 140.869333] RDX: 0000000000000001 RSI: 0000000000000400 RDI: 0000000000000830 [ 140.876585] RBP: ffff88012b007b70 R08: 0000000000000400 R09: 0000000000000003 [ 140.883962] R10: ffff88012b000db0 R11: 0000000000000001 R12: 0000000000080000 [ 140.891215] R13: 0000000000000001 R14: 0000000000000002 R15: 000000000000a130 [ 140.898461] FS: 0000000000000000(0000) GS:ffff88012c100000(0000) knlGS:0000000000000000 [ 140.906669] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 140.912531] CR2: 00007ffe31553e30 CR3: 000000000301a000 CR4: 00000000001406e0 [ 140.919770] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 140.927028] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 140.934278] Stack: [ 140.936431] ffffffff810c261a ffff88012b007bb8 ffffffff810c2701 0000000000000282 [ 140.943940] 0000000000000001 00000000000114e0 0000000000000001 ffffffff810bf280 [ 140.951457] 0000000000000040 0000000000000001 ffff88012b007bc8 ffffffff810c27ce [ 140.958958] Call Trace: [ 140.961524] [] ? __x2apic_send_IPI_dest.constprop.7+0x3a/0x40 [ 140.969030] [] __x2apic_send_IPI_mask+0xe1/0x150 [ 140.975415] [] ? irq_force_complete_move+0xe0/0xe0 [ 140.982104] [] x2apic_send_IPI_mask+0xe/0x10 [ 140.988134] [] nmi_raise_cpu_backtrace+0x16/0x20 [ 140.994519] [] nmi_trigger_all_cpu_backtrace+0x322/0x330 [ 141.001595] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 141.008608] [] do_raw_spin_lock+0xad/0x160 [ 141.014545] [] _raw_spin_lock+0x3e/0x50 [ 141.020179] [] ? nf_conntrack_lock+0xd/0x50 [ 141.026127] [] nf_conntrack_lock+0xd/0x50 [ 141.031911] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 141.038204] [] cttimeout_net_exit+0x28/0x80 [ 141.044155] [] ops_exit_list.isra.4+0x33/0x60 [ 141.050289] [] cleanup_net+0x1a9/0x270 [ 141.055803] [] process_one_work+0x21b/0x690 [ 141.061777] [] ? process_one_work+0x17e/0x690 [ 141.067896] [] worker_thread+0x49/0x490 [ 141.073520] [] ? process_one_work+0x690/0x690 [ 141.079636] [] kthread+0xea/0x100 [ 141.084720] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 141.091368] [] ret_from_fork+0x3f/0x70 [ 141.096873] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 141.103686] Code: 5b 5d c3 48 c1 e2 20 48 89 d3 31 d2 48 09 c3 48 89 de e8 8e 4e 7f 00 48 89 d8 5b 5d c3 0f 1f 84 00 00 00 00 00 89 f0 89 f9 0f 30 <31> c0 0f 1f 44 00 00 c3 41 89 f0 48 89 d6 55 89 c2 48 c1 e6 20 [ 141.409938] INFO: rcu_preempt self-detected stall on CPU [ 141.415575] 1-...: (10452 ticks this GP) idle=679/140000000000001/0 softirq=5598/5598 fqs=10500 [ 141.424553] (t=10501 jiffies g=442 c=441 q=926) [ 141.429487] Task dump for CPU 1: [ 141.432822] kworker/u4:1 R running task 11680 19 2 0x00000008 [ 141.440248] Workqueue: netns cleanup_net [ 141.444409] ffff88012b000500 ffff88012c103da0 ffffffff811a0063 0000000000000001 [ 141.452427] ffffffff83072b80 0000000000000086 ffff88012c103db8 ffffffff811a2e42 [ 141.460529] 0000000000000002 ffff88012c103de8 ffffffff811dc909 ffff88012c117dc0 [ 141.468543] Call Trace: [ 141.471103] [] sched_show_task+0xe3/0x180 [ 141.477617] [] dump_cpu_task+0x32/0x40 [ 141.483132] [] rcu_dump_cpu_stacks+0x89/0xe0 [ 141.489166] [] rcu_check_callbacks+0x66d/0xa30 [ 141.495376] [] ? tick_sched_do_timer+0x30/0x30 [ 141.501600] [] ? tick_sched_do_timer+0x30/0x30 [ 141.507819] [] update_process_times+0x34/0x60 [ 141.513938] [] tick_sched_handle.isra.20+0x20/0x60 [ 141.520490] [] tick_sched_timer+0x38/0x70 [ 141.526263] [] __hrtimer_run_queues+0x11d/0x4a0 [ 141.532556] [] ? hrtimer_interrupt+0x88/0x1b0 [ 141.538674] [] hrtimer_interrupt+0xaa/0x1b0 [ 141.544623] [] local_apic_timer_interrupt+0x31/0x50 [ 141.551263] [] smp_apic_timer_interrupt+0x38/0x50 [ 141.557731] [] apic_timer_interrupt+0x8c/0xa0 [ 141.563850] [] ? kvm_wait+0xbb/0xe0 [ 141.569838] [] ? native_safe_halt+0x6/0x10 [ 141.575701] [] ? trace_hardirqs_on+0xd/0x10 [ 141.581657] [] kvm_wait+0xca/0xe0 [ 141.586737] [] __pv_queued_spin_lock_slowpath+0x26a/0x2d0 [ 141.593900] [] do_raw_spin_lock+0x157/0x160 [ 141.599861] [] _raw_spin_lock+0x3e/0x50 [ 141.605460] [] ? nf_conntrack_lock+0xd/0x50 [ 141.611407] [] nf_conntrack_lock+0xd/0x50 [ 141.617182] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 141.623486] [] cttimeout_net_exit+0x28/0x80 [ 141.629434] [] ops_exit_list.isra.4+0x33/0x60 [ 141.635555] [] cleanup_net+0x1a9/0x270 [ 141.641069] [] process_one_work+0x21b/0x690 [ 141.647015] [] ? process_one_work+0x17e/0x690 [ 141.653148] [] worker_thread+0x49/0x490 [ 141.658759] [] ? process_one_work+0x690/0x690 [ 141.664889] [] kthread+0xea/0x100 [ 141.669967] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 141.676625] [] ret_from_fork+0x3f/0x70 [ 141.682151] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 141.688796] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 141.694746] 1-...: (10454 ticks this GP) idle=679/140000000000000/0 softirq=5598/5598 fqs=10501 [ 141.703967] (detected by 0, t=10502 jiffies, g=442, c=441, q=926) [ 141.710392] Task dump for CPU 1: [ 141.713732] kworker/u4:1 R running task 11680 19 2 0x00000008 [ 141.721146] Workqueue: netns cleanup_net [ 141.725326] 0000000000000292 ffffffff81003017 0000000000000000 0000000000000000 [ 141.733354] 0000000000000001 0000000000000000 ffff88012b000500 ffff88012b77e300 [ 141.741379] ffff88012c117180 ffffffff82d21be2 0140000000000001 ffffffff825d6f79 [ 141.749520] Call Trace: [ 141.752078] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 141.758638] [] ? retint_kernel+0x2d/0x2d [ 141.764318] [] ? kvm_wait+0xbb/0xe0 [ 141.769586] [] ? native_safe_halt+0x6/0x10 [ 141.775527] [] ? trace_hardirqs_on+0xd/0x10 [ 141.781468] [] ? __pv_queued_spin_lock_slowpath+0x26a/0x2d0 [ 141.788796] [] ? do_raw_spin_lock+0x157/0x160 [ 141.794908] [] ? _raw_spin_lock+0x3e/0x50 [ 141.800684] [] ? nf_conntrack_lock+0xd/0x50 [ 141.806632] [] ? nf_conntrack_lock+0xd/0x50 [ 141.812572] [] ? ctnl_untimeout.isra.4+0xdc/0x110 [ 141.819043] [] ? cttimeout_net_exit+0x28/0x80 [ 141.825156] [] ? ops_exit_list.isra.4+0x33/0x60 [ 141.831455] [] ? cleanup_net+0x1a9/0x270 [ 141.837146] [] ? process_one_work+0x21b/0x690 [ 141.843269] [] ? process_one_work+0x17e/0x690 [ 141.849381] [] ? worker_thread+0x49/0x490 [ 141.855147] [] ? process_one_work+0x690/0x690 [ 141.861267] [] ? kthread+0xea/0x100 [ 141.866513] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 141.873171] [] ? ret_from_fork+0x3f/0x70 [ 141.878861] [] ? kthread_create_on_node+0x1f0/0x1f0