[ 29.217779] May be due to missing lock nesting notation [ 29.217779] [ 29.224706] 4 locks held by kworker/u4:0/6: [ 29.229001] #0: ("%s""netns"){.+.+.+}, at: [] process_one_work+0x17e/0x690 [ 29.238361] #1: (net_cleanup_work){+.+.+.}, at: [] process_one_work+0x17e/0x690 [ 29.248155] #2: (net_mutex){+.+.+.}, at: [] cleanup_net+0x7a/0x270 [ 29.256808] #3: (&(&nf_conntrack_locks[i])->rlock){+.....}, at: [] nf_conntrack_lock+0xd/0x50 [ 29.267845] [ 29.267845] stack backtrace: [ 29.272332] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc3-syzkaller #0 [ 29.279763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.289096] Workqueue: netns cleanup_net [ 29.293280] 0000000000000000 ffff88012b76bb20 ffffffff8195d870 ffffffff83e2b5e0 [ 29.301308] ffffffff83e2b5e0 ffff88012b76bbf8 ffffffff811bfe9c ffff88012b76bbc0 [ 29.309297] 0000000000000082 0000000000000001 0000000000000000 ffff88012b76bb60 [ 29.317395] Call Trace: [ 29.319953] [] dump_stack+0x99/0xd9 [ 29.325291] [] __lock_acquire+0x1a5c/0x1ba0 [ 29.331261] [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 29.338015] [] lock_acquire+0xed/0x210 [ 29.343528] [] ? nf_conntrack_lock+0xd/0x50 [ 29.349473] [] _raw_spin_lock+0x36/0x50 [ 29.355067] [] ? nf_conntrack_lock+0xd/0x50 [ 29.361024] [] nf_conntrack_lock+0xd/0x50 [ 29.367403] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 29.373706] [] cttimeout_net_exit+0x28/0x80 [ 29.379661] [] ops_exit_list.isra.4+0x33/0x60 [ 29.385782] [] cleanup_net+0x1a9/0x270 [ 29.391291] [] process_one_work+0x21b/0x690 [ 29.397839] [] ? process_one_work+0x17e/0x690 [ 29.403966] [] worker_thread+0x49/0x490 [ 29.409582] [] ? process_one_work+0x690/0x690 [ 29.415738] [] kthread+0xea/0x100 [ 29.420817] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 29.427476] [] ret_from_fork+0x3f/0x70 [ 29.433089] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 31.217795] kobject: 'regulatory.0' (ffff88021acc1020): kobject_uevent_env [ 31.224845] kobject: 'regulatory.0' (ffff88021acc1020): fill_kobj_path: path = '/devices/platform/regulatory.0' Warning: Permanently added '10.128.0.137' (ECDSA) to the list of known hosts. [ 34.377821] kobject: 'regulatory.0' (ffff88021acc1020): kobject_uevent_env [ 34.384862] kobject: 'regulatory.0' (ffff88021acc1020): fill_kobj_path: path = '/devices/platform/regulatory.0' 2019/12/10 12:56:47 parsed 1 programs 2019/12/10 12:56:47 executed programs: 0 [ 34.652854] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 34.660084] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 34.668942] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 34.675940] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 34.684623] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 34.691686] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 131.978590] BUG: spinlock lockup suspected on CPU#1, kworker/u4:0/6 [ 131.985477] lock: nf_conntrack_locks+0x0/0xe000, .magic: dead4ead, .owner: kworker/u4:0/6, .owner_cpu: 1 [ 131.995987] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc3-syzkaller #0 [ 132.003490] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 132.012933] Workqueue: netns cleanup_net [ 132.017158] 0000000000000000 ffff88012b76bc18 ffffffff8195d870 ffff88012b766180 [ 132.025265] ffffffff8320a780 ffff88012b76bc38 ffffffff811c4393 ffffffff8320a780 [ 132.033604] 0000000089173700 ffff88012b76bc68 ffffffff811c44c3 ffffffff8320a780 [ 132.042259] Call Trace: [ 132.044886] [] dump_stack+0x99/0xd9 [ 132.050146] [] spin_dump+0x73/0xc0 [ 132.055316] [] do_raw_spin_lock+0xa3/0x160 [ 132.061214] [] _raw_spin_lock+0x3e/0x50 [ 132.067103] [] ? nf_conntrack_lock+0xd/0x50 [ 132.073065] [] nf_conntrack_lock+0xd/0x50 [ 132.078969] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 132.085274] [] cttimeout_net_exit+0x28/0x80 [ 132.091386] [] ops_exit_list.isra.4+0x33/0x60 [ 132.097552] [] cleanup_net+0x1a9/0x270 [ 132.103355] [] process_one_work+0x21b/0x690 [ 132.109409] [] ? process_one_work+0x17e/0x690 [ 132.115619] [] worker_thread+0x49/0x490 [ 132.121226] [] ? process_one_work+0x690/0x690 [ 132.127351] [] kthread+0xea/0x100 [ 132.133338] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 132.140133] [] ret_from_fork+0x3f/0x70 [ 132.145919] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 132.152802] Sending NMI to all CPUs: [ 132.157605] NMI backtrace for cpu 0 [ 132.161506] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc3-syzkaller #0 [ 132.168697] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 132.179007] task: ffffffff83221540 ti: ffffffff83200000 task.ti: ffffffff83200000 [ 132.187773] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 132.196203] RSP: 0018:ffffffff83203eb8 EFLAGS: 00000282 [ 132.201789] RAX: 0000000000000000 RBX: ffffffff83200000 RCX: 0000000000000000 [ 132.209447] RDX: 0000000000000000 RSI: ffffffff82f6e2c0 RDI: ffffffff81089bf6 [ 132.216862] RBP: ffffffff83203eb8 R08: 0000000000000000 R09: 0000000000000001 [ 132.224483] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83204000 [ 132.231759] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff83200000 [ 132.239229] FS: 0000000000000000(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 [ 132.247692] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 132.253584] CR2: 000000c4200b1ff8 CR3: 00000000b4b5e000 CR4: 00000000001406f0 [ 132.260854] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 132.268433] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 132.275849] Stack: [ 132.278001] ffffffff83203ed8 ffffffff81089c09 ffffffff83200000 ffffffff83204000 [ 132.286073] ffffffff83203ee8 ffffffff8108a61a ffffffff83203ef8 ffffffff811b7b85 [ 132.293928] ffffffff83203f40 ffffffff811b7f7f ffffffff835922e0 ffffffff83204000 [ 132.301588] Call Trace: [ 132.304393] [] default_idle+0x29/0x190 [ 132.310193] [] arch_cpu_idle+0xa/0x10 [ 132.315662] [] default_idle_call+0x25/0x50 [ 132.321713] [] cpu_startup_entry+0x3cf/0x460 [ 132.327829] [] rest_init+0x131/0x140 [ 132.333210] [] start_kernel+0x44a/0x457 [ 132.338984] [] ? early_idt_handler_array+0x120/0x120 [ 132.346113] [] x86_64_start_reservations+0x2a/0x2c [ 132.352723] [] x86_64_start_kernel+0x145/0x152 [ 132.359116] 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 [ 132.378724] NMI backtrace for cpu 1 [ 132.382423] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc3-syzkaller #0 [ 132.389885] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 132.399604] Workqueue: netns cleanup_net [ 132.403780] task: ffff88012b766180 ti: ffff88012b768000 task.ti: ffff88012b768000 [ 132.411403] RIP: 0010:[] [] native_write_msr_safe+0x6/0x40 [ 132.420433] RSP: 0018:ffff88012b76bb68 EFLAGS: 00000086 [ 132.425868] RAX: 0000000000000400 RBX: ffffffff83471680 RCX: 0000000000000830 [ 132.433466] RDX: 0000000000000001 RSI: 0000000000000400 RDI: 0000000000000830 [ 132.441471] RBP: ffff88012b76bb70 R08: 0000000000000400 R09: 0000000000000003 [ 132.448773] R10: ffff88012b766a30 R11: 0000000000000001 R12: 0000000000080000 [ 132.456797] R13: 0000000000000001 R14: 0000000000000002 R15: 000000000000a130 [ 132.464306] FS: 0000000000000000(0000) GS:ffff88012c100000(0000) knlGS:0000000000000000 [ 132.472557] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 132.478436] CR2: 0000562947f14000 CR3: 000000000321a000 CR4: 00000000001406e0 [ 132.485699] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 132.493121] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 132.500415] Stack: [ 132.502552] ffffffff810c261a ffff88012b76bbb8 ffffffff810c2701 0000000000000282 [ 132.510615] 0000000000000001 00000000000114e0 0000000000000001 ffffffff810bf280 [ 132.518282] 0000000000000040 0000000000000001 ffff88012b76bbc8 ffffffff810c27ce [ 132.525893] Call Trace: [ 132.528480] [] ? __x2apic_send_IPI_dest.constprop.7+0x3a/0x40 [ 132.536304] [] __x2apic_send_IPI_mask+0xe1/0x150 [ 132.542834] [] ? irq_force_complete_move+0xe0/0xe0 [ 132.549612] [] x2apic_send_IPI_mask+0xe/0x10 [ 132.555697] [] nmi_raise_cpu_backtrace+0x16/0x20 [ 132.562111] [] nmi_trigger_all_cpu_backtrace+0x322/0x330 [ 132.569642] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 132.576788] [] do_raw_spin_lock+0xad/0x160 [ 132.582716] [] _raw_spin_lock+0x3e/0x50 [ 132.588538] [] ? nf_conntrack_lock+0xd/0x50 [ 132.594643] [] nf_conntrack_lock+0xd/0x50 [ 132.600498] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 132.606920] [] cttimeout_net_exit+0x28/0x80 [ 132.612898] [] ops_exit_list.isra.4+0x33/0x60 [ 132.619037] [] cleanup_net+0x1a9/0x270 [ 132.624884] [] process_one_work+0x21b/0x690 [ 132.630871] [] ? process_one_work+0x17e/0x690 [ 132.637035] [] worker_thread+0x49/0x490 [ 132.642909] [] ? process_one_work+0x690/0x690 [ 132.649229] [] kthread+0xea/0x100 [ 132.655449] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 132.662282] [] ret_from_fork+0x3f/0x70 [ 132.667928] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 132.674754] Code: 5b 5d c3 48 c1 e2 20 48 89 d3 31 d2 48 09 c3 48 89 de e8 7e fc 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 [ 134.117798] INFO: rcu_preempt self-detected stall on CPU [ 134.123396] 1-...: (10452 ticks this GP) idle=7fb/140000000000001/0 softirq=5378/5378 fqs=10429 [ 134.132384] (t=10500 jiffies g=340 c=339 q=835) [ 134.137341] Task dump for CPU 1: [ 134.140676] kworker/u4:0 R running task 13504 6 2 0x00000008 [ 134.148093] Workqueue: netns cleanup_net [ 134.152255] ffff88012b766180 ffff88012c103da0 ffffffff8119faa3 0000000000000001 [ 134.160417] ffffffff83272c00 0000000000000086 ffff88012c103db8 ffffffff811a2882 [ 134.168403] 0000000000000002 ffff88012c103de8 ffffffff811dc349 ffff88012c117dc0 [ 134.176405] Call Trace: [ 134.178980] [] sched_show_task+0xe3/0x180 [ 134.185499] [] dump_cpu_task+0x32/0x40 [ 134.191009] [] rcu_dump_cpu_stacks+0x89/0xe0 [ 134.197038] [] rcu_check_callbacks+0x66d/0xa30 [ 134.203240] [] ? tick_sched_do_timer+0x30/0x30 [ 134.209441] [] ? tick_sched_do_timer+0x30/0x30 [ 134.215659] [] update_process_times+0x34/0x60 [ 134.221779] [] tick_sched_handle.isra.20+0x20/0x60 [ 134.228346] [] tick_sched_timer+0x38/0x70 [ 134.234116] [] __hrtimer_run_queues+0x11d/0x4a0 [ 134.240407] [] ? hrtimer_interrupt+0x88/0x1b0 [ 134.246521] [] hrtimer_interrupt+0xaa/0x1b0 [ 134.252465] [] local_apic_timer_interrupt+0x31/0x50 [ 134.259102] [] smp_apic_timer_interrupt+0x38/0x50 [ 134.265569] [] apic_timer_interrupt+0x8c/0xa0 [ 134.271681] [] ? kvm_wait+0xbb/0xe0 [ 134.277834] [] ? native_safe_halt+0x6/0x10 [ 134.283700] [] ? trace_hardirqs_on+0xd/0x10 [ 134.289643] [] kvm_wait+0xca/0xe0 [ 134.294729] [] __pv_queued_spin_lock_slowpath+0x26a/0x2d0 [ 134.301885] [] do_raw_spin_lock+0x157/0x160 [ 134.307831] [] _raw_spin_lock+0x3e/0x50 [ 134.313452] [] ? nf_conntrack_lock+0xd/0x50 [ 134.319395] [] nf_conntrack_lock+0xd/0x50 [ 134.325243] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 134.331748] [] cttimeout_net_exit+0x28/0x80 [ 134.337695] [] ops_exit_list.isra.4+0x33/0x60 [ 134.343822] [] cleanup_net+0x1a9/0x270 [ 134.349604] [] process_one_work+0x21b/0x690 [ 134.355815] [] ? process_one_work+0x17e/0x690 [ 134.361939] [] worker_thread+0x49/0x490 [ 134.367539] [] ? process_one_work+0x690/0x690 [ 134.373668] [] kthread+0xea/0x100 [ 134.378743] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 134.385382] [] ret_from_fork+0x3f/0x70 [ 134.390891] [] ? kthread_create_on_node+0x1f0/0x1f0