[ 34.221163] 4 locks held by kworker/u4:0/6: [ 34.225473] #0: ("%s""netns"){.+.+.+}, at: [] process_one_work+0x17e/0x690 [ 34.234837] #1: (net_cleanup_work){+.+.+.}, at: [] process_one_work+0x17e/0x690 [ 34.244630] #2: (net_mutex){+.+.+.}, at: [] cleanup_net+0x7a/0x270 [ 34.253297] #3: (&(&nf_conntrack_locks[i])->rlock){+.....}, at: [] nf_conntrack_lock+0xd/0x50 [ 34.264313] [ 34.264313] stack backtrace: [ 34.268783] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc3-syzkaller #0 [ 34.276200] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.285545] Workqueue: netns cleanup_net [ 34.289703] 0000000000000000 ffff88012b767b20 ffffffff8195cc30 ffffffff83e2c0f0 [ 34.297711] ffffffff83e2c0f0 ffff88012b767bf8 ffffffff811bf25c ffff88012b767bc0 [ 34.305771] 0000000000000082 0000000000000001 0000000000000000 ffff88012b767b60 [ 34.313859] Call Trace: [ 34.316424] [] dump_stack+0x99/0xd9 [ 34.321719] [] __lock_acquire+0x1a5c/0x1ba0 [ 34.327689] [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 34.334414] [] lock_acquire+0xed/0x210 [ 34.339926] [] ? nf_conntrack_lock+0xd/0x50 [ 34.345881] [] _raw_spin_lock+0x36/0x50 [ 34.351473] [] ? nf_conntrack_lock+0xd/0x50 [ 34.357416] [] nf_conntrack_lock+0xd/0x50 [ 34.363187] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 34.369475] [] cttimeout_net_exit+0x28/0x80 [ 34.375419] [] ops_exit_list.isra.4+0x33/0x60 [ 34.381530] [] cleanup_net+0x1a9/0x270 [ 34.387106] [] process_one_work+0x21b/0x690 [ 34.393051] [] ? process_one_work+0x17e/0x690 [ 34.399172] [] worker_thread+0x49/0x490 [ 34.404779] [] ? process_one_work+0x690/0x690 [ 34.410903] [] kthread+0xea/0x100 [ 34.416022] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 34.422660] [] ret_from_fork+0x3f/0x70 [ 34.428168] [] ? kthread_create_on_node+0x1f0/0x1f0 Warning: Permanently added '10.128.15.215' (ECDSA) to the list of known hosts. 2019/12/04 21:38:47 parsed 1 programs 2019/12/04 21:38:47 executed programs: 0 [ 39.577343] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 39.584761] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 39.596099] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 39.603259] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 39.613773] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 39.620911] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 136.802630] BUG: spinlock lockup suspected on CPU#1, kworker/u4:0/6 [ 136.809095] lock: nf_conntrack_locks+0x0/0xe000, .magic: dead4ead, .owner: kworker/u4:0/6, .owner_cpu: 1 [ 136.818787] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc3-syzkaller #0 [ 136.826216] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 136.835550] Workqueue: netns cleanup_net [ 136.839706] 0000000000000000 ffff88012b767c18 ffffffff8195cc30 ffff88012b760180 [ 136.847709] ffffffff8320a780 ffff88012b767c38 ffffffff811c3753 ffffffff8320a780 [ 136.855713] 0000000089173700 ffff88012b767c68 ffffffff811c3883 ffffffff8320a780 [ 136.863750] Call Trace: [ 136.866319] [] dump_stack+0x99/0xd9 [ 136.871585] [] spin_dump+0x73/0xc0 [ 136.876753] [] do_raw_spin_lock+0xa3/0x160 [ 136.882611] [] _raw_spin_lock+0x3e/0x50 [ 136.888210] [] ? nf_conntrack_lock+0xd/0x50 [ 136.894156] [] nf_conntrack_lock+0xd/0x50 [ 136.899925] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 136.906217] [] cttimeout_net_exit+0x28/0x80 [ 136.912159] [] ops_exit_list.isra.4+0x33/0x60 [ 136.918273] [] cleanup_net+0x1a9/0x270 [ 136.923782] [] process_one_work+0x21b/0x690 [ 136.929723] [] ? process_one_work+0x17e/0x690 [ 136.935837] [] worker_thread+0x49/0x490 [ 136.941430] [] ? process_one_work+0x690/0x690 [ 136.947548] [] kthread+0xea/0x100 [ 136.952631] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 136.959267] [] ret_from_fork+0x3f/0x70 [ 136.964775] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 136.971447] Sending NMI to all CPUs: [ 136.975245] NMI backtrace for cpu 0 [ 136.978882] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc3-syzkaller #0 [ 136.986062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 136.995398] task: ffffffff83221540 ti: ffffffff83200000 task.ti: ffffffff83200000 [ 137.003001] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 137.011396] RSP: 0018:ffffffff83203eb8 EFLAGS: 00000282 [ 137.016833] RAX: 0000000000000000 RBX: ffffffff83200000 RCX: 0000000000000000 [ 137.024096] RDX: 0000000000000000 RSI: ffffffff82f69d89 RDI: ffffffff81089bf6 [ 137.031343] RBP: ffffffff83203eb8 R08: 0000000000000000 R09: 0000000000000001 [ 137.038598] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83204000 [ 137.045863] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff83200000 [ 137.053108] FS: 0000000000000000(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 [ 137.061332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 137.067205] CR2: 000000c4200b1ff8 CR3: 00000000ab521000 CR4: 00000000001406f0 [ 137.074461] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 137.081724] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 137.088980] Stack: [ 137.091105] ffffffff83203ed8 ffffffff81089c09 ffffffff83200000 ffffffff83204000 [ 137.098766] ffffffff83203ee8 ffffffff8108a61a ffffffff83203ef8 ffffffff811b6f45 [ 137.106280] ffffffff83203f40 ffffffff811b733f ffffffff835902e0 ffffffff83204000 [ 137.113782] Call Trace: [ 137.116346] [] default_idle+0x29/0x190 [ 137.121858] [] arch_cpu_idle+0xa/0x10 [ 137.127297] [] default_idle_call+0x25/0x50 [ 137.133153] [] cpu_startup_entry+0x3cf/0x460 [ 137.139278] [] rest_init+0x131/0x140 [ 137.144618] [] start_kernel+0x44a/0x457 [ 137.150223] [] ? early_idt_handler_array+0x120/0x120 [ 137.156966] [] x86_64_start_reservations+0x2a/0x2c [ 137.163530] [] x86_64_start_kernel+0x145/0x152 [ 137.169752] 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 [ 137.189352] NMI backtrace for cpu 1 [ 137.192966] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc3-syzkaller #0 [ 137.200418] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 137.209858] Workqueue: netns cleanup_net [ 137.213893] task: ffff88012b760180 ti: ffff88012b764000 task.ti: ffff88012b764000 [ 137.221503] RIP: 0010:[] [] native_write_msr_safe+0x6/0x40 [ 137.230454] RSP: 0018:ffff88012b767b68 EFLAGS: 00000086 [ 137.235889] RAX: 0000000000000400 RBX: ffffffff83470880 RCX: 0000000000000830 [ 137.243312] RDX: 0000000000000001 RSI: 0000000000000400 RDI: 0000000000000830 [ 137.250624] RBP: ffff88012b767b70 R08: 0000000000000400 R09: 0000000000000003 [ 137.257879] R10: ffff88012b760a30 R11: 0000000000000001 R12: 0000000000080000 [ 137.265139] R13: 0000000000000001 R14: 0000000000000002 R15: 000000000000a130 [ 137.272430] FS: 0000000000000000(0000) GS:ffff88012c100000(0000) knlGS:0000000000000000 [ 137.280691] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 137.286557] CR2: 00007fac72e10150 CR3: 000000000321a000 CR4: 00000000001406e0 [ 137.293800] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 137.301091] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 137.308358] Stack: [ 137.310484] ffffffff810c261a ffff88012b767bb8 ffffffff810c2701 0000000000000282 [ 137.318014] 0000000000000001 00000000000114e0 0000000000000001 ffffffff810bf280 [ 137.325538] 0000000000000040 0000000000000001 ffff88012b767bc8 ffffffff810c27ce [ 137.333043] Call Trace: [ 137.335611] [] ? __x2apic_send_IPI_dest.constprop.7+0x3a/0x40 [ 137.343120] [] __x2apic_send_IPI_mask+0xe1/0x150 [ 137.349507] [] ? irq_force_complete_move+0xe0/0xe0 [ 137.356066] [] x2apic_send_IPI_mask+0xe/0x10 [ 137.362093] [] nmi_raise_cpu_backtrace+0x16/0x20 [ 137.368479] [] nmi_trigger_all_cpu_backtrace+0x322/0x330 [ 137.375585] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 137.382569] [] do_raw_spin_lock+0xad/0x160 [ 137.388445] [] _raw_spin_lock+0x3e/0x50 [ 137.394048] [] ? nf_conntrack_lock+0xd/0x50 [ 137.400030] [] nf_conntrack_lock+0xd/0x50 [ 137.405809] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 137.412148] [] cttimeout_net_exit+0x28/0x80 [ 137.418111] [] ops_exit_list.isra.4+0x33/0x60 [ 137.424280] [] cleanup_net+0x1a9/0x270 [ 137.429961] [] process_one_work+0x21b/0x690 [ 137.435969] [] ? process_one_work+0x17e/0x690 [ 137.442138] [] worker_thread+0x49/0x490 [ 137.447746] [] ? process_one_work+0x690/0x690 [ 137.453867] [] kthread+0xea/0x100 [ 137.458973] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 137.465649] [] ret_from_fork+0x3f/0x70 [ 137.471168] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 137.477818] Code: 5b 5d c3 48 c1 e2 20 48 89 d3 31 d2 48 09 c3 48 89 de e8 3e f0 8c 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 [ 139.124104] INFO: rcu_preempt self-detected stall on CPU [ 139.129705] 1-...: (10454 ticks this GP) idle=35b/140000000000001/0 softirq=6107/6107 fqs=10501 [ 139.134094] INFO: rcu_preempt detected stalls on CPUs/tasks: [ 139.134096] 1-...: (10454 ticks this GP) idle=35b/140000000000001/0 softirq=6107/6107 fqs=10501 [ 139.134098] (detected by 0, t=10502 jiffies, g=452, c=451, q=943) [ 139.134099] Task dump for CPU 1: [ 139.134106] kworker/u4:0 R running task 13504 6 2 0x00000008 [ 139.134117] Workqueue: netns cleanup_net [ 139.134121] 0000000000000292 ffffffff81003017 0000000000000000 0000000000000000 [ 139.134123] 0000000000000001 0000000000000000 ffff88012b760180 ffff88012b788300 [ 139.134125] ffff88012c117180 ffffffff82f69d89 0140000000000001 ffffffff826ddcf9 [ 139.134126] Call Trace: [ 139.134134] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 139.134140] [] ? retint_kernel+0x2d/0x2d [ 139.134146] [] ? kvm_wait+0xbb/0xe0 [ 139.134149] [] ? native_safe_halt+0x6/0x10 [ 139.134154] [] ? trace_hardirqs_on+0xd/0x10 [ 139.134156] [] ? kvm_wait+0xca/0xe0 [ 139.134159] [] ? __pv_queued_spin_lock_slowpath+0x26a/0x2d0 [ 139.134162] [] ? do_raw_spin_lock+0x157/0x160 [ 139.134164] [] ? _raw_spin_lock+0x3e/0x50 [ 139.134170] [] ? nf_conntrack_lock+0xd/0x50 [ 139.134171] [] ? nf_conntrack_lock+0xd/0x50 [ 139.134177] [] ? ctnl_untimeout.isra.4+0xdc/0x110 [ 139.134179] [] ? cttimeout_net_exit+0x28/0x80 [ 139.134182] [] ? ops_exit_list.isra.4+0x33/0x60 [ 139.134183] [] ? cleanup_net+0x1a9/0x270 [ 139.134187] [] ? process_one_work+0x21b/0x690 [ 139.134189] [] ? process_one_work+0x17e/0x690 [ 139.134190] [] ? worker_thread+0x49/0x490 [ 139.134192] [] ? process_one_work+0x690/0x690 [ 139.134195] [] ? kthread+0xea/0x100 [ 139.134198] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 139.134200] [] ? ret_from_fork+0x3f/0x70 [ 139.134202] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 139.344931] (t=10523 jiffies g=452 c=451 q=943) [ 139.349880] Task dump for CPU 1: [ 139.353216] kworker/u4:0 R running task 13504 6 2 0x00000008 [ 139.360661] Workqueue: netns cleanup_net [ 139.364830] ffff88012b760180 ffff88012c103da0 ffffffff8119ee63 0000000000000001 [ 139.372842] ffffffff83272b00 0000000000000086 ffff88012c103db8 ffffffff811a1c42 [ 139.380948] 0000000000000002 ffff88012c103de8 ffffffff811db709 ffff88012c117dc0 [ 139.388964] Call Trace: [ 139.391522] [] sched_show_task+0xe3/0x180 [ 139.398033] [] dump_cpu_task+0x32/0x40 [ 139.403548] [] rcu_dump_cpu_stacks+0x89/0xe0 [ 139.409585] [] rcu_check_callbacks+0x66d/0xa30 [ 139.415793] [] ? tick_sched_do_timer+0x30/0x30 [ 139.422002] [] ? tick_sched_do_timer+0x30/0x30 [ 139.428211] [] update_process_times+0x34/0x60 [ 139.434340] [] tick_sched_handle.isra.20+0x20/0x60 [ 139.440897] [] tick_sched_timer+0x38/0x70 [ 139.446675] [] __hrtimer_run_queues+0x11d/0x4a0 [ 139.452973] [] ? hrtimer_interrupt+0x88/0x1b0 [ 139.459095] [] hrtimer_interrupt+0xaa/0x1b0 [ 139.465043] [] local_apic_timer_interrupt+0x31/0x50 [ 139.471690] [] smp_apic_timer_interrupt+0x38/0x50 [ 139.478158] [] apic_timer_interrupt+0x8c/0xa0 [ 139.484279] [] ? kvm_wait+0xbb/0xe0 [ 139.490270] [] ? native_safe_halt+0x6/0x10 [ 139.496129] [] ? trace_hardirqs_on+0xd/0x10 [ 139.502073] [] kvm_wait+0xca/0xe0 [ 139.507150] [] __pv_queued_spin_lock_slowpath+0x26a/0x2d0 [ 139.514313] [] do_raw_spin_lock+0x157/0x160 [ 139.520277] [] _raw_spin_lock+0x3e/0x50 [ 139.525879] [] ? nf_conntrack_lock+0xd/0x50 [ 139.531823] [] nf_conntrack_lock+0xd/0x50 [ 139.537599] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 139.543895] [] cttimeout_net_exit+0x28/0x80 [ 139.549843] [] ops_exit_list.isra.4+0x33/0x60 [ 139.555960] [] cleanup_net+0x1a9/0x270 [ 139.561473] [] process_one_work+0x21b/0x690 [ 139.567417] [] ? process_one_work+0x17e/0x690 [ 139.573536] [] worker_thread+0x49/0x490 [ 139.579132] [] ? process_one_work+0x690/0x690 [ 139.585252] [] kthread+0xea/0x100 [ 139.590331] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 139.596969] [] ret_from_fork+0x3f/0x70 [ 139.602483] [] ? kthread_create_on_node+0x1f0/0x1f0