WARNING in __nf_unregister_net_hook ------------[ cut here ]------------ hook not found, pf 3 num 0 WARNING: CPU: 0 PID: 300 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x1eb/0x610 net/netfilter/core.c:480 Modules linked in: CPU: 0 PID: 300 Comm: kworker/u4:4 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:__nf_unregister_net_hook+0x1eb/0x610 net/netfilter/core.c:480 Code: 0f b6 14 02 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 11 04 00 00 8b 53 1c 89 ee 48 c7 c7 e0 0f 6e 8a e8 08 10 8a 01 <0f> 0b e9 e5 00 00 00 e8 f9 70 2e fa 44 8b 3c 24 4c 89 f8 48 c1 e0 RSP: 0018:ffffc90001ddfbc0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff888144694e00 RCX: 0000000000000000 RDX: ffff88801255d4c0 RSI: ffffffff815cc9a5 RDI: fffff520003bbf6a RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815c680e R11: 0000000000000000 R12: ffff888017988f20 R13: 0000000000000000 R14: ffff888028637400 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ff2276000 CR3: 00000000131d2000 CR4: 0000000000350ef0 Call Trace: nf_unregister_net_hook net/netfilter/core.c:502 [inline] nf_unregister_net_hooks+0x117/0x160 net/netfilter/core.c:576 arpt_unregister_table_pre_exit+0x67/0x80 net/ipv4/netfilter/arp_tables.c:1565 ops_pre_exit_list net/core/net_namespace.c:165 [inline] cleanup_net+0x451/0xb10 net/core/net_namespace.c:583 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.39' (ECDSA) to the list of known hosts. 2021/05/07 15:02:02 fuzzer started 2021/05/07 15:02:02 connecting to host at 10.128.0.169:46631 2021/05/07 15:02:02 checking machine... 2021/05/07 15:02:02 checking revisions... 2021/05/07 15:02:02 testing simple program... syzkaller login: [ 56.023908][ T8416] chnl_net:caif_netlink_parms(): no params data found [ 56.083861][ T8416] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.091435][ T8416] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.101517][ T8416] device bridge_slave_0 entered promiscuous mode [ 56.111782][ T8416] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.126756][ T8416] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.135836][ T8416] device bridge_slave_1 entered promiscuous mode [ 56.153414][ T8416] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 56.164297][ T8416] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 56.184499][ T8416] team0: Port device team_slave_0 added [ 56.191539][ T8416] team0: Port device team_slave_1 added [ 56.206602][ T8416] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 56.213742][ T8416] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 56.239692][ T8416] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 56.251687][ T8416] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 56.258717][ T8416] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 56.284748][ T8416] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 56.307589][ T8416] device hsr_slave_0 entered promiscuous mode [ 56.315106][ T8416] device hsr_slave_1 entered promiscuous mode [ 56.391636][ T8416] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 56.401847][ T8416] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 56.411837][ T8416] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 56.420978][ T8416] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 56.442157][ T8416] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.449824][ T8416] bridge0: port 2(bridge_slave_1) entered forwarding state [ 56.457440][ T8416] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.464539][ T8416] bridge0: port 1(bridge_slave_0) entered forwarding state [ 56.503963][ T8416] 8021q: adding VLAN 0 to HW filter on device bond0 [ 56.517272][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 56.528599][ T8] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.537553][ T8] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.546399][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 56.558654][ T8416] 8021q: adding VLAN 0 to HW filter on device team0 [ 56.571667][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 56.580704][ T36] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.587807][ T36] bridge0: port 1(bridge_slave_0) entered forwarding state [ 56.606168][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 56.615461][ T20] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.622696][ T20] bridge0: port 2(bridge_slave_1) entered forwarding state [ 56.664487][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 56.673965][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 56.687648][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 56.703004][ T8416] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 56.716926][ T8416] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 56.726070][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 56.734174][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 56.754684][ T8416] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 56.761942][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 56.769307][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 56.786781][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 56.805118][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 56.813313][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 56.820791][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 56.831737][ T8416] device veth0_vlan entered promiscuous mode [ 56.843140][ T8416] device veth1_vlan entered promiscuous mode [ 56.862482][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 56.870342][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 56.879667][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 56.890135][ T8416] device veth0_macvtap entered promiscuous mode [ 56.900233][ T8416] device veth1_macvtap entered promiscuous mode [ 56.916297][ T8416] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 56.924906][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 56.936266][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 56.948510][ T8416] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 56.957541][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 56.969187][ T8416] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 56.980580][ T8416] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 56.992553][ T8416] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 57.002326][ T8416] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 57.069145][ T520] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 57.082379][ T520] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 57.115165][ T36] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 57.123824][ T520] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 57.133749][ T520] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 57.142479][ T8637] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/05/07 15:02:05 building call list... executing program [ 57.627946][ T300] ------------[ cut here ]------------ [ 57.634982][ T300] hook not found, pf 3 num 0 [ 57.635477][ T300] WARNING: CPU: 0 PID: 300 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x1eb/0x610 [ 57.650412][ T300] Modules linked in: [ 57.654537][ T300] CPU: 0 PID: 300 Comm: kworker/u4:4 Not tainted 5.12.0-syzkaller #0 [ 57.663181][ T300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.674346][ T300] Workqueue: netns cleanup_net [ 57.679129][ T300] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x610 [ 57.686544][ T300] Code: 0f b6 14 02 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 11 04 00 00 8b 53 1c 89 ee 48 c7 c7 e0 0f 6e 8a e8 08 10 8a 01 <0f> 0b e9 e5 00 00 00 e8 f9 70 2e fa 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 57.707929][ T300] RSP: 0018:ffffc90001ddfbc0 EFLAGS: 00010286 [ 57.714820][ T300] RAX: 0000000000000000 RBX: ffff888144694e00 RCX: 0000000000000000 [ 57.723515][ T300] RDX: ffff88801255d4c0 RSI: ffffffff815cc9a5 RDI: fffff520003bbf6a [ 57.731501][ T300] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 57.741448][ T300] R10: ffffffff815c680e R11: 0000000000000000 R12: ffff888017988f20 [ 57.750664][ T300] R13: 0000000000000000 R14: ffff888028637400 R15: 0000000000000001 [ 57.759165][ T300] FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 57.768688][ T300] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.777447][ T300] CR2: 00007f0ff2276000 CR3: 00000000131d2000 CR4: 0000000000350ef0 [ 57.786067][ T300] Call Trace: [ 57.789358][ T300] nf_unregister_net_hooks+0x117/0x160 [ 57.795706][ T300] arpt_unregister_table_pre_exit+0x67/0x80 [ 57.801631][ T300] ? arptable_filter_net_exit+0x20/0x20 [ 57.808078][ T300] cleanup_net+0x451/0xb10 [ 57.813572][ T300] ? ops_free_list.part.0+0x3d0/0x3d0 [ 57.818973][ T300] process_one_work+0x98d/0x1600 [ 57.825119][ T300] ? pwq_dec_nr_in_flight+0x320/0x320 [ 57.830517][ T300] ? rwlock_bug.part.0+0x90/0x90 [ 57.837267][ T300] ? _raw_spin_lock_irq+0x41/0x50 [ 57.842842][ T300] worker_thread+0x64c/0x1120 [ 57.847541][ T300] ? __kthread_parkme+0x13f/0x1e0 [ 57.855851][ T300] ? process_one_work+0x1600/0x1600 [ 57.861153][ T300] kthread+0x3b1/0x4a0 [ 57.866990][ T300] ? __kthread_bind_mask+0xc0/0xc0 [ 57.872696][ T300] ret_from_fork+0x1f/0x30 [ 57.877144][ T300] Kernel panic - not syncing: panic_on_warn set ... [ 57.883893][ T300] CPU: 0 PID: 300 Comm: kworker/u4:4 Not tainted 5.12.0-syzkaller #0 [ 57.891953][ T300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.902006][ T300] Workqueue: netns cleanup_net [ 57.906775][ T300] Call Trace: [ 57.910052][ T300] dump_stack+0x141/0x1d7 [ 57.914389][ T300] panic+0x306/0x73d [ 57.918285][ T300] ? __warn_printk+0xf3/0xf3 [ 57.922884][ T300] ? __warn.cold+0x1a/0x44 [ 57.927302][ T300] ? __nf_unregister_net_hook+0x1eb/0x610 [ 57.933024][ T300] __warn.cold+0x35/0x44 [ 57.937271][ T300] ? __nf_unregister_net_hook+0x1eb/0x610 [ 57.942995][ T300] report_bug+0x1bd/0x210 [ 57.948087][ T300] handle_bug+0x3c/0x60 [ 57.952253][ T300] exc_invalid_op+0x14/0x40 [ 57.956758][ T300] asm_exc_invalid_op+0x12/0x20 [ 57.961610][ T300] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x610 [ 57.967942][ T300] Code: 0f b6 14 02 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 11 04 00 00 8b 53 1c 89 ee 48 c7 c7 e0 0f 6e 8a e8 08 10 8a 01 <0f> 0b e9 e5 00 00 00 e8 f9 70 2e fa 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 57.987547][ T300] RSP: 0018:ffffc90001ddfbc0 EFLAGS: 00010286 [ 57.993613][ T300] RAX: 0000000000000000 RBX: ffff888144694e00 RCX: 0000000000000000 [ 58.001581][ T300] RDX: ffff88801255d4c0 RSI: ffffffff815cc9a5 RDI: fffff520003bbf6a [ 58.009550][ T300] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 58.017516][ T300] R10: ffffffff815c680e R11: 0000000000000000 R12: ffff888017988f20 [ 58.025482][ T300] R13: 0000000000000000 R14: ffff888028637400 R15: 0000000000000001 [ 58.033458][ T300] ? wake_up_klogd.part.0+0x8e/0xd0 [ 58.038666][ T300] ? vprintk+0x95/0x260 [ 58.042829][ T300] nf_unregister_net_hooks+0x117/0x160 [ 58.048298][ T300] arpt_unregister_table_pre_exit+0x67/0x80 [ 58.054200][ T300] ? arptable_filter_net_exit+0x20/0x20 [ 58.059763][ T300] cleanup_net+0x451/0xb10 [ 58.064189][ T300] ? ops_free_list.part.0+0x3d0/0x3d0 [ 58.069580][ T300] process_one_work+0x98d/0x1600 [ 58.074761][ T300] ? pwq_dec_nr_in_flight+0x320/0x320 [ 58.080247][ T300] ? rwlock_bug.part.0+0x90/0x90 [ 58.085181][ T300] ? _raw_spin_lock_irq+0x41/0x50 [ 58.090228][ T300] worker_thread+0x64c/0x1120 [ 58.094919][ T300] ? __kthread_parkme+0x13f/0x1e0 [ 58.099942][ T300] ? process_one_work+0x1600/0x1600 [ 58.105148][ T300] kthread+0x3b1/0x4a0 [ 58.109224][ T300] ? __kthread_bind_mask+0xc0/0xc0 [ 58.114337][ T300] ret_from_fork+0x1f/0x30 [ 58.123049][ T300] Kernel Offset: disabled [ 58.127739][ T300] Rebooting in 86400 seconds..