[ 35.362785] May be due to missing lock nesting notation [ 35.362785] [ 35.369689] 4 locks held by kworker/u4:0/6: [ 35.373983] #0: ("%s""netns"){.+.+.+}, at: [] process_one_work+0x17e/0x650 [ 35.383546] #1: (net_cleanup_work){+.+.+.}, at: [] process_one_work+0x17e/0x650 [ 35.393345] #2: (net_mutex){+.+.+.}, at: [] cleanup_net+0x7a/0x270 [ 35.401986] #3: (&(&nf_conntrack_locks[i])->rlock){+.-...}, at: [] nf_conntrack_lock+0xd/0x50 [ 35.413157] [ 35.413157] stack backtrace: [ 35.417628] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc2-syzkaller #0 [ 35.425045] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.434500] Workqueue: netns cleanup_net [ 35.438662] ffffffff8399d8d0 ffff8802169a7b10 ffffffff8180b169 ffffffff8399d8d0 [ 35.446667] ffff8802169a7bf0 ffffffff811bbafc ffff8802169a2180 0000000000000286 [ 35.454695] ffffffff83f6a7e8 ffff8802169a7b48 ffffffff8393b920 ffff8802169a7b68 [ 35.462697] Call Trace: [ 35.465258] [] dump_stack+0x4b/0x72 [ 35.470509] [] __lock_acquire+0x1a5c/0x1ba0 [ 35.476469] [] ? debug_lockdep_rcu_enabled+0x1d/0x20 [ 35.483209] [] lock_acquire+0xe7/0x1f0 [ 35.488726] [] ? nf_conntrack_lock+0xd/0x50 [ 35.494673] [] _raw_spin_lock+0x33/0x50 [ 35.500274] [] ? nf_conntrack_lock+0xd/0x50 [ 35.506252] [] nf_conntrack_lock+0xd/0x50 [ 35.512134] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 35.518438] [] cttimeout_net_exit+0x28/0x80 [ 35.524389] [] ops_exit_list.isra.4+0x33/0x60 [ 35.530533] [] cleanup_net+0x1a9/0x270 [ 35.536077] [] process_one_work+0x215/0x650 [ 35.542049] [] ? process_one_work+0x17e/0x650 [ 35.548166] [] worker_thread+0x49/0x490 [ 35.553860] [] ? process_one_work+0x650/0x650 [ 35.559981] [] kthread+0xf9/0x110 [ 35.565076] [] ? kthread_create_on_node+0x220/0x220 [ 35.571718] [] ret_from_fork+0x3f/0x70 [ 35.577228] [] ? kthread_create_on_node+0x220/0x220 Warning: Permanently added '10.128.0.147' (ECDSA) to the list of known hosts. 2019/11/25 06:57:47 parsed 1 programs 2019/11/25 06:57:47 executed programs: 0 [ 121.957516] BUG: spinlock lockup suspected on CPU#1, kworker/u4:0/6 [ 121.964120] lock: nf_conntrack_locks+0x0/0xe000, .magic: dead4ead, .owner: kworker/u4:0/6, .owner_cpu: 1 [ 121.973817] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc2-syzkaller #0 [ 121.981250] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 121.990731] Workqueue: netns cleanup_net [ 121.994934] ffffffff82e0a780 ffff8802169a7c10 ffffffff8180b169 ffff8802169a2180 [ 122.003071] ffff8802169a7c30 ffffffff811bfed3 ffffffff82e0a780 0000000089173700 [ 122.011091] ffff8802169a7c60 ffffffff811bfffb ffffffff82e0a780 ffff8802157d5570 [ 122.019183] Call Trace: [ 122.021766] [] dump_stack+0x4b/0x72 [ 122.027071] [] spin_dump+0x73/0xc0 [ 122.032256] [] do_raw_spin_lock+0x9b/0x160 [ 122.038125] [] _raw_spin_lock+0x3b/0x50 [ 122.043750] [] ? nf_conntrack_lock+0xd/0x50 [ 122.049704] [] nf_conntrack_lock+0xd/0x50 [ 122.055485] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 122.061789] [] cttimeout_net_exit+0x28/0x80 [ 122.067742] [] ops_exit_list.isra.4+0x33/0x60 [ 122.073880] [] cleanup_net+0x1a9/0x270 [ 122.079501] [] process_one_work+0x215/0x650 [ 122.085455] [] ? process_one_work+0x17e/0x650 [ 122.091582] [] worker_thread+0x49/0x490 [ 122.097188] [] ? process_one_work+0x650/0x650 [ 122.103328] [] kthread+0xf9/0x110 [ 122.108412] [] ? kthread_create_on_node+0x220/0x220 [ 122.115066] [] ret_from_fork+0x3f/0x70 [ 122.120599] [] ? kthread_create_on_node+0x220/0x220 [ 122.127361] Sending NMI to all CPUs: [ 122.131167] NMI backtrace for cpu 0 [ 122.134777] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc2-syzkaller #0 [ 122.141946] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 122.151293] task: ffffffff82e21540 ti: ffffffff82e00000 task.ti: ffffffff82e00000 [ 122.158904] RIP: 0010:[] [] native_safe_halt+0x6/0x10 [ 122.167310] RSP: 0018:ffffffff82e03eb8 EFLAGS: 00000282 [ 122.172746] RAX: 0000000000000000 RBX: ffffffff82e00000 RCX: 0000000000000000 [ 122.180121] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff810876d9 [ 122.187389] RBP: ffffffff82e03eb8 R08: 0000000000000000 R09: 0000000000000001 [ 122.194651] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 122.202084] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff82e00000 [ 122.209482] FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 122.217752] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 122.223726] CR2: 0000000000481420 CR3: 00000000b9c88000 CR4: 00000000001406f0 [ 122.230990] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 122.238246] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 122.245518] Stack: [ 122.247654] ffffffff82e03ed8 ffffffff810876e8 ffffffff82e00000 ffffffff82e04000 [ 122.255210] ffffffff82e03ee8 ffffffff8108803a ffffffff82e03ef8 ffffffff811b3bd5 [ 122.262922] ffffffff82e03f40 ffffffff811b3fb7 ffffffff82e04000 9b64ffb15f2c34b6 [ 122.270438] Call Trace: [ 122.273006] [] default_idle+0x28/0x160 [ 122.278524] [] arch_cpu_idle+0xa/0x10 [ 122.283955] [] default_idle_call+0x25/0x50 [ 122.289835] [] cpu_startup_entry+0x3b7/0x440 [ 122.295891] [] rest_init+0x135/0x140 [ 122.301238] [] start_kernel+0x4a6/0x4b3 [ 122.306863] [] ? early_idt_handler_array+0x120/0x120 [ 122.313595] [] x86_64_start_reservations+0x2a/0x2c [ 122.320156] [] x86_64_start_kernel+0x145/0x152 [ 122.326382] 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 [ 122.345461] NMI backtrace for cpu 1 [ 122.349069] CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.5.0-rc2-syzkaller #0 [ 122.356511] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 122.365850] Workqueue: netns cleanup_net [ 122.369893] task: ffff8802169a2180 ti: ffff8802169a4000 task.ti: ffff8802169a4000 [ 122.377516] RIP: 0010:[] [] native_write_msr_safe+0x6/0x40 [ 122.386333] RSP: 0018:ffff8802169a7b68 EFLAGS: 00000086 [ 122.391763] RAX: 0000000000000400 RBX: ffffffff8301c5a0 RCX: 0000000000000830 [ 122.399015] RDX: 0000000000000001 RSI: 0000000000000400 RDI: 0000000000000830 [ 122.406269] RBP: ffff8802169a7b70 R08: 0000000000000400 R09: 0000000000000003 [ 122.413521] R10: ffff8802169a2a18 R11: 0000000000000001 R12: 0000000000080000 [ 122.421125] R13: 0000000000000001 R14: 0000000000000001 R15: 000000000000a130 [ 122.428467] FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 122.436692] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 122.442995] CR2: 000056007cb90000 CR3: 0000000002e1a000 CR4: 00000000001406e0 [ 122.450249] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 122.457504] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 122.464780] Stack: [ 122.466912] ffffffff810bd7fa ffff8802169a7bb8 ffffffff810bd8af 0000000000000282 [ 122.474439] 0000000200000010 0000000000011440 0000000000000001 ffffffff810ba4c0 [ 122.482022] 0000000089173700 0000000000000001 ffff8802169a7bc8 ffffffff810bd97e [ 122.489533] Call Trace: [ 122.492110] [] ? __x2apic_send_IPI_dest.constprop.7+0x3a/0x40 [ 122.499650] [] __x2apic_send_IPI_mask+0xaf/0x120 [ 122.506038] [] ? irq_force_complete_move+0xe0/0xe0 [ 122.512602] [] x2apic_send_IPI_mask+0xe/0x10 [ 122.518660] [] nmi_raise_cpu_backtrace+0x16/0x20 [ 122.525047] [] nmi_trigger_all_cpu_backtrace+0x243/0x250 [ 122.532137] [] ? show_stack+0x20/0x50 [ 122.537570] [] arch_trigger_all_cpu_backtrace+0x14/0x20 [ 122.544591] [] do_raw_spin_lock+0xa5/0x160 [ 122.550482] [] _raw_spin_lock+0x3b/0x50 [ 122.556975] [] ? nf_conntrack_lock+0xd/0x50 [ 122.563092] [] nf_conntrack_lock+0xd/0x50 [ 122.568898] [] ctnl_untimeout.isra.4+0xdc/0x110 [ 122.575216] [] cttimeout_net_exit+0x28/0x80 [ 122.581174] [] ops_exit_list.isra.4+0x33/0x60 [ 122.587308] [] cleanup_net+0x1a9/0x270 [ 122.592919] [] process_one_work+0x215/0x650 [ 122.598873] [] ? process_one_work+0x17e/0x650 [ 122.605002] [] worker_thread+0x49/0x490 [ 122.610637] [] ? process_one_work+0x650/0x650 [ 122.616777] [] kthread+0xf9/0x110 [ 122.621929] [] ? kthread_create_on_node+0x220/0x220 [ 122.628595] [] ret_from_fork+0x3f/0x70 [ 122.634114] [] ? kthread_create_on_node+0x220/0x220 [ 122.640763] Code: 5b 5d c3 48 c1 e2 20 48 89 d3 31 d2 48 09 c3 48 89 de e8 9e 07 78 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 55 41 89 f0 48 89 d6 48 c1 e6 20 89 c2