[ 34.606215] May be due to missing lock nesting notation [ 34.606215] [ 34.613168] 4 locks held by kworker/u4:4/2177: [ 34.617729] #0: ("%s""netns"){.+.+.+}, at: [] process_one_work+0x17e/0x690 [ 34.627059] #1: (net_cleanup_work){+.+.+.}, at: [] process_one_work+0x17e/0x690 [ 34.636821] #2: (net_mutex){+.+.+.}, at: [] cleanup_net+0x7a/0x270 [ 34.645521] #3: (&(&nf_conntrack_locks[i])->rlock){+.....}, at: [] nf_conntrack_lock+0xd/0x50 [ 34.656500] [ 34.656500] stack backtrace: [ 34.660967] CPU: 1 PID: 2177 Comm: kworker/u4:4 Not tainted 4.5.0-rc3-syzkaller #0 [ 34.668642] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.677970] Workqueue: netns cleanup_net [ 34.682124] 0000000000000000 ffff8800ba9b3b20 ffffffff81882ab0 ffffffff83c06ed0 [ 34.690115] ffffffff83c06ed0 ffff8800ba9b3bf8 ffffffff811c045c ffff88012aa24280 [ 34.698121] ffffffff825d4c0c 000000000004df40 0000000000000000 ffff8800ba9b3b60 [ 34.706111] Call Trace: [ 34.708673] [] dump_stack+0x99/0xd9 [ 34.713920] [] __lock_acquire+0x1a5c/0x1ba0 [ 34.719868] [] ? _raw_spin_unlock_irqrestore+0x4c/0x90 [ 34.726765] [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 34.733490] [] ? free_one_page+0x34/0x3e0 [ 34.739259] [] lock_acquire+0xed/0x210 [ 34.744822] [] ? nf_conntrack_lock+0xd/0x50 [ 34.750765] [] _raw_spin_lock+0x36/0x50 [ 34.756356] [] ? nf_conntrack_lock+0xd/0x50 [ 34.762295] [] nf_conntrack_lock+0xd/0x50 [ 34.768062] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 34.774381] [] cttimeout_net_exit+0x28/0x80 [ 34.780322] [] ops_exit_list.isra.4+0x33/0x60 [ 34.786436] [] cleanup_net+0x1a9/0x270 [ 34.791955] [] process_one_work+0x21b/0x690 [ 34.797896] [] ? process_one_work+0x17e/0x690 [ 34.804008] [] worker_thread+0x49/0x490 [ 34.809600] [] ? process_one_work+0x690/0x690 [ 34.815715] [] ? process_one_work+0x690/0x690 [ 34.821833] [] kthread+0xea/0x100 [ 34.826909] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 34.833544] [] ret_from_fork+0x3f/0x70 [ 34.839085] [] ? kthread_create_on_node+0x1f0/0x1f0 Warning: Permanently added '10.128.0.96' (ECDSA) to the list of known hosts. 2019/11/25 09:06:38 parsed 1 programs 2019/11/25 09:06:38 executed programs: 0 [ 40.023921] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 40.033385] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 40.040567] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 40.050804] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 40.057938] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 40.065138] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 138.794825] BUG: spinlock lockup suspected on CPU#1, kworker/u4:4/2177 [ 138.801588] lock: nf_conntrack_locks+0x0/0xe000, .magic: dead4ead, .owner: kworker/u4:4/2177, .owner_cpu: 1 [ 138.811533] CPU: 1 PID: 2177 Comm: kworker/u4:4 Not tainted 4.5.0-rc3-syzkaller #0 [ 138.819213] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 138.828608] Workqueue: netns cleanup_net [ 138.832775] 0000000000000000 ffff8800ba9b3c18 ffffffff81882ab0 ffff88012aa24280 [ 138.840802] ffffffff8300a780 ffff8800ba9b3c38 ffffffff811c4953 ffffffff8300a780 [ 138.848836] 0000000089173700 ffff8800ba9b3c68 ffffffff811c4a83 ffffffff8300a780 [ 138.856816] Call Trace: [ 138.859376] [] dump_stack+0x99/0xd9 [ 138.864623] [] spin_dump+0x73/0xc0 [ 138.869782] [] do_raw_spin_lock+0xa3/0x160 [ 138.875638] [] _raw_spin_lock+0x3e/0x50 [ 138.881232] [] ? nf_conntrack_lock+0xd/0x50 [ 138.887204] [] nf_conntrack_lock+0xd/0x50 [ 138.892969] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 138.899255] [] cttimeout_net_exit+0x28/0x80 [ 138.905197] [] ops_exit_list.isra.4+0x33/0x60 [ 138.911309] [] cleanup_net+0x1a9/0x270 [ 138.916814] [] process_one_work+0x21b/0x690 [ 138.922752] [] ? process_one_work+0x17e/0x690 [ 138.928865] [] worker_thread+0x49/0x490 [ 138.934457] [] ? process_one_work+0x690/0x690 [ 138.940587] [] ? process_one_work+0x690/0x690 [ 138.946700] [] kthread+0xea/0x100 [ 138.951781] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 138.958426] [] ret_from_fork+0x3f/0x70 [ 138.963955] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 138.970611] Sending NMI to all CPUs: [ 138.974378] NMI backtrace for cpu 0 [ 138.977986] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc3-syzkaller #0 [ 138.985143] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 138.994492] task: ffffffff83021540 ti: ffffffff83000000 task.ti: ffffffff83000000 [ 139.002093] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 139.010472] RSP: 0018:ffffffff83003eb8 EFLAGS: 00000282 [ 139.015898] RAX: 0000000000000000 RBX: ffffffff83000000 RCX: 0000000000000000 [ 139.023145] RDX: 0000000000000000 RSI: ffffffff82d21536 RDI: ffffffff81089bf6 [ 139.030409] RBP: ffffffff83003eb8 R08: 0000000000000000 R09: 0000000000000001 [ 139.037666] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff83004000 [ 139.044917] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff83000000 [ 139.052209] FS: 0000000000000000(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 [ 139.060439] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 139.066289] CR2: 000000c4200bdff8 CR3: 00000000b1261000 CR4: 00000000001406f0 [ 139.073574] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 139.080943] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 139.088250] Stack: [ 139.090376] ffffffff83003ed8 ffffffff81089c09 ffffffff83000000 ffffffff83004000 [ 139.097888] ffffffff83003ee8 ffffffff8108a61a ffffffff83003ef8 ffffffff811b8145 [ 139.105396] ffffffff83003f40 ffffffff811b853f ffffffff8336a2e0 ffffffff83004000 [ 139.112910] Call Trace: [ 139.115474] [] default_idle+0x29/0x190 [ 139.120993] [] arch_cpu_idle+0xa/0x10 [ 139.126442] [] default_idle_call+0x25/0x50 [ 139.132330] [] cpu_startup_entry+0x3cf/0x460 [ 139.138366] [] rest_init+0x131/0x140 [ 139.143702] [] start_kernel+0x44a/0x457 [ 139.149308] [] ? early_idt_handler_array+0x120/0x120 [ 139.156034] [] x86_64_start_reservations+0x2a/0x2c [ 139.162600] [] x86_64_start_kernel+0x145/0x152 [ 139.168817] 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 [ 139.187826] NMI backtrace for cpu 1 [ 139.191427] CPU: 1 PID: 2177 Comm: kworker/u4:4 Not tainted 4.5.0-rc3-syzkaller #0 [ 139.199114] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 139.208450] Workqueue: netns cleanup_net [ 139.212507] task: ffff88012aa24280 ti: ffff8800ba9b0000 task.ti: ffff8800ba9b0000 [ 139.220109] RIP: 0010:[] [] native_write_msr_safe+0x6/0x40 [ 139.228924] RSP: 0018:ffff8800ba9b3b68 EFLAGS: 00000086 [ 139.234342] RAX: 0000000000000400 RBX: ffffffff8324cec0 RCX: 0000000000000830 [ 139.241590] RDX: 0000000000000001 RSI: 0000000000000400 RDI: 0000000000000830 [ 139.248838] RBP: ffff8800ba9b3b70 R08: 0000000000000400 R09: 0000000000000003 [ 139.256096] R10: ffff88012aa24b30 R11: 0000000000000001 R12: 0000000000080000 [ 139.263358] R13: 0000000000000001 R14: 0000000000000002 R15: 000000000000a130 [ 139.270609] FS: 0000000000000000(0000) GS:ffff88012c100000(0000) knlGS:0000000000000000 [ 139.278823] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 139.284683] CR2: 00000000021cfe20 CR3: 00000000b1261000 CR4: 00000000001406e0 [ 139.291988] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 139.299248] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 139.306499] Stack: [ 139.308625] ffffffff810c261a ffff8800ba9b3bb8 ffffffff810c2701 0000000000000282 [ 139.316171] 0000000000000001 00000000000114e0 0000000000000001 ffffffff810bf280 [ 139.323719] 0000000000000040 0000000000000001 ffff8800ba9b3bc8 ffffffff810c27ce [ 139.331239] Call Trace: [ 139.333806] [] ? __x2apic_send_IPI_dest.constprop.7+0x3a/0x40 [ 139.341332] [] __x2apic_send_IPI_mask+0xe1/0x150 [ 139.347717] [] ? irq_force_complete_move+0xe0/0xe0 [ 139.354262] [] x2apic_send_IPI_mask+0xe/0x10 [ 139.360296] [] nmi_raise_cpu_backtrace+0x16/0x20 [ 139.366682] [] nmi_trigger_all_cpu_backtrace+0x322/0x330 [ 139.373750] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 139.380741] [] do_raw_spin_lock+0xad/0x160 [ 139.386609] [] _raw_spin_lock+0x3e/0x50 [ 139.392199] [] ? nf_conntrack_lock+0xd/0x50 [ 139.398150] [] nf_conntrack_lock+0xd/0x50 [ 139.403918] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 139.410214] [] cttimeout_net_exit+0x28/0x80 [ 139.416155] [] ops_exit_list.isra.4+0x33/0x60 [ 139.422291] [] cleanup_net+0x1a9/0x270 [ 139.427829] [] process_one_work+0x21b/0x690 [ 139.433768] [] ? process_one_work+0x17e/0x690 [ 139.439889] [] worker_thread+0x49/0x490 [ 139.445487] [] ? process_one_work+0x690/0x690 [ 139.451610] [] ? process_one_work+0x690/0x690 [ 139.457731] [] kthread+0xea/0x100 [ 139.462814] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 139.469473] [] ret_from_fork+0x3f/0x70 [ 139.474983] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 139.481627] 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 [ 139.506429] INFO: rcu_preempt self-detected stall on CPU [ 139.512040] 1-...: (10451 ticks this GP) idle=40d/140000000000001/0 softirq=6615/6615 fqs=10444 [ 139.521017] (t=10500 jiffies g=371 c=370 q=925) [ 139.525965] Task dump for CPU 1: [ 139.529298] kworker/u4:4 R running task 12640 2177 2 0x00000008 [ 139.536708] Workqueue: netns cleanup_net [ 139.540853] ffff88012aa24280 ffff88012c103da0 ffffffff811a0063 0000000000000001 [ 139.548845] ffffffff83072b80 0000000000000086 ffff88012c103db8 ffffffff811a2e42 [ 139.556819] 0000000000000002 ffff88012c103de8 ffffffff811dc909 ffff88012c117dc0 [ 139.564805] Call Trace: [ 139.567357] [] sched_show_task+0xe3/0x180 [ 139.573871] [] dump_cpu_task+0x32/0x40 [ 139.579381] [] rcu_dump_cpu_stacks+0x89/0xe0 [ 139.585419] [] rcu_check_callbacks+0x66d/0xa30 [ 139.591620] [] ? tick_sched_do_timer+0x30/0x30 [ 139.597820] [] ? tick_sched_do_timer+0x30/0x30 [ 139.604028] [] update_process_times+0x34/0x60 [ 139.610138] [] tick_sched_handle.isra.20+0x20/0x60 [ 139.616685] [] tick_sched_timer+0x38/0x70 [ 139.622448] [] __hrtimer_run_queues+0x11d/0x4a0 [ 139.628733] [] ? hrtimer_interrupt+0x88/0x1b0 [ 139.634847] [] hrtimer_interrupt+0xaa/0x1b0 [ 139.640799] [] local_apic_timer_interrupt+0x31/0x50 [ 139.647429] [] smp_apic_timer_interrupt+0x38/0x50 [ 139.653891] [] apic_timer_interrupt+0x8c/0xa0 [ 139.660003] [] ? kvm_wait+0xbb/0xe0 [ 139.665991] [] ? native_safe_halt+0x6/0x10 [ 139.671847] [] ? trace_hardirqs_on+0xd/0x10 [ 139.677787] [] kvm_wait+0xca/0xe0 [ 139.682858] [] __pv_queued_spin_lock_slowpath+0x26a/0x2d0 [ 139.690023] [] do_raw_spin_lock+0x157/0x160 [ 139.695971] [] _raw_spin_lock+0x3e/0x50 [ 139.701562] [] ? nf_conntrack_lock+0xd/0x50 [ 139.707511] [] nf_conntrack_lock+0xd/0x50 [ 139.713276] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 139.719566] [] cttimeout_net_exit+0x28/0x80 [ 139.725506] [] ops_exit_list.isra.4+0x33/0x60 [ 139.731613] [] cleanup_net+0x1a9/0x270 [ 139.737126] [] process_one_work+0x21b/0x690 [ 139.743063] [] ? process_one_work+0x17e/0x690 [ 139.749174] [] worker_thread+0x49/0x490 [ 139.754763] [] ? process_one_work+0x690/0x690 [ 139.760876] [] ? process_one_work+0x690/0x690 [ 139.766989] [] kthread+0xea/0x100 [ 139.772087] [] ? kthread_create_on_node+0x1f0/0x1f0 [ 139.778723] [] ret_from_fork+0x3f/0x70 [ 139.784236] [] ? kthread_create_on_node+0x1f0/0x1f0