WARNING in __nf_unregister_net_hook ------------[ cut here ]------------ hook not found, pf 3 num 0 WARNING: CPU: 1 PID: 280 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x1eb/0x610 net/netfilter/core.c:480 Modules linked in: CPU: 1 PID: 280 Comm: kworker/u4:5 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 40 79 6d 8a e8 f0 59 8a 01 <0f> 0b e9 e5 00 00 00 e8 19 64 30 fa 44 8b 3c 24 4c 89 f8 48 c1 e0 RSP: 0018:ffffc90001ccfbc0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880204ff400 RCX: 0000000000000000 RDX: ffff888011b63880 RSI: ffffffff815c8ba5 RDI: fffff52000399f6a RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815c2a0e R11: 0000000000000000 R12: ffff888025388f20 R13: 0000000000000000 R14: ffff888020496300 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84191eb010 CR3: 0000000016456000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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 Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. 2021/05/05 20:15:32 fuzzer started 2021/05/05 20:15:32 connecting to host at 10.128.0.169:42359 2021/05/05 20:15:32 checking machine... 2021/05/05 20:15:32 checking revisions... 2021/05/05 20:15:32 testing simple program... syzkaller login: [ 74.030762][ T8426] chnl_net:caif_netlink_parms(): no params data found [ 74.083621][ T8426] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.093040][ T8426] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.103661][ T8426] device bridge_slave_0 entered promiscuous mode [ 74.115909][ T8426] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.125597][ T8426] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.135246][ T8426] device bridge_slave_1 entered promiscuous mode [ 74.156744][ T8426] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 74.169764][ T8426] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 74.193334][ T8426] team0: Port device team_slave_0 added [ 74.203141][ T8426] team0: Port device team_slave_1 added [ 74.222638][ T8426] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 74.231288][ T8426] 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. [ 74.264736][ T8426] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 74.281430][ T8426] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 74.291355][ T8426] 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. [ 74.322131][ T8426] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 74.351095][ T8426] device hsr_slave_0 entered promiscuous mode [ 74.359496][ T8426] device hsr_slave_1 entered promiscuous mode [ 74.467792][ T8426] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 74.479431][ T8426] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 74.492011][ T8426] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 74.502929][ T8426] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 74.533075][ T8426] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.541302][ T8426] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.550547][ T8426] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.558699][ T8426] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.609023][ T8426] 8021q: adding VLAN 0 to HW filter on device bond0 [ 74.623045][ T3146] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 74.637869][ T3146] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.646877][ T3146] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.658250][ T3146] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 74.678763][ T8426] 8021q: adding VLAN 0 to HW filter on device team0 [ 74.692247][ T3146] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 74.703666][ T3146] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.712277][ T3146] bridge0: port 1(bridge_slave_0) entered forwarding state [ 74.738804][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 74.749324][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.756680][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 74.766695][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 74.790994][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 74.800312][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 74.810898][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 74.820289][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 74.830762][ T8426] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 74.851676][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 74.860148][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 74.875204][ T8426] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 74.898653][ T37] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 74.926877][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 74.937105][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 74.946363][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 74.961463][ T8426] device veth0_vlan entered promiscuous mode [ 74.981866][ T8426] device veth1_vlan entered promiscuous mode [ 75.012179][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 75.024383][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 75.036700][ T8426] device veth0_macvtap entered promiscuous mode [ 75.050089][ T8426] device veth1_macvtap entered promiscuous mode [ 75.070632][ T8426] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 75.080589][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 75.093325][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 75.105667][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 75.115551][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 75.128286][ T8426] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 75.145078][ T8646] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 75.156297][ T8646] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 75.168838][ T8426] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 75.180698][ T8426] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 75.191819][ T8426] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 75.202860][ T8426] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 75.296727][ T220] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 75.329887][ T220] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 75.343567][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 75.361399][ T9] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 75.382237][ T9] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 75.393675][ T8649] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/05/05 20:15:35 building call list... [ 76.043858][ T280] ------------[ cut here ]------------ [ 76.051782][ T280] hook not found, pf 3 num 0 [ 76.052411][ T280] WARNING: CPU: 1 PID: 280 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x1eb/0x610 [ 76.083726][ T280] Modules linked in: [ 76.092402][ T280] CPU: 1 PID: 280 Comm: kworker/u4:5 Not tainted 5.12.0-syzkaller #0 [ 76.108903][ T280] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.127771][ T280] Workqueue: netns cleanup_net [ 76.142108][ T280] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x610 [ 76.160644][ T280] 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 40 79 6d 8a e8 f0 59 8a 01 <0f> 0b e9 e5 00 00 00 e8 19 64 30 fa 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 76.201710][ T280] RSP: 0018:ffffc90001ccfbc0 EFLAGS: 00010286 [ 76.210520][ T280] RAX: 0000000000000000 RBX: ffff8880204ff400 RCX: 0000000000000000 [ 76.228084][ T280] RDX: ffff888011b63880 RSI: ffffffff815c8ba5 RDI: fffff52000399f6a [ 76.243156][ T280] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 76.256427][ T280] R10: ffffffff815c2a0e R11: 0000000000000000 R12: ffff888025388f20 [ 76.269665][ T280] R13: 0000000000000000 R14: ffff888020496300 R15: 0000000000000001 [ 76.284119][ T280] FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 76.299346][ T280] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 76.318096][ T280] CR2: 00007f84191eb010 CR3: 0000000016456000 CR4: 00000000001506e0 [ 76.329730][ T280] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 76.341380][ T280] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 76.359275][ T280] Call Trace: [ 76.367320][ T280] nf_unregister_net_hooks+0x117/0x160 [ 76.376773][ T280] arpt_unregister_table_pre_exit+0x67/0x80 [ 76.383577][ T280] ? arptable_filter_net_exit+0x20/0x20 [ 76.392303][ T280] cleanup_net+0x451/0xb10 [ 76.399307][ T280] ? ops_free_list.part.0+0x3d0/0x3d0 [ 76.407012][ T280] process_one_work+0x98d/0x1600 [ 76.412481][ T280] ? pwq_dec_nr_in_flight+0x320/0x320 [ 76.419995][ T280] ? rwlock_bug.part.0+0x90/0x90 [ 76.427434][ T280] ? _raw_spin_lock_irq+0x41/0x50 [ 76.436214][ T280] worker_thread+0x64c/0x1120 [ 76.442721][ T280] ? process_one_work+0x1600/0x1600 [ 76.448430][ T280] kthread+0x3b1/0x4a0 [ 76.453543][ T280] ? __kthread_bind_mask+0xc0/0xc0 [ 76.461494][ T280] ret_from_fork+0x1f/0x30 [ 76.469653][ T280] Kernel panic - not syncing: panic_on_warn set ... [ 76.477153][ T280] CPU: 1 PID: 280 Comm: kworker/u4:5 Not tainted 5.12.0-syzkaller #0 [ 76.486235][ T280] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.496495][ T280] Workqueue: netns cleanup_net [ 76.502009][ T280] Call Trace: [ 76.506034][ T280] dump_stack+0x141/0x1d7 [ 76.510554][ T280] panic+0x306/0x73d [ 76.515507][ T280] ? __warn_printk+0xf3/0xf3 [ 76.520541][ T280] ? __warn.cold+0x1a/0x44 [ 76.525142][ T280] ? __nf_unregister_net_hook+0x1eb/0x610 [ 76.531234][ T280] __warn.cold+0x35/0x44 [ 76.535664][ T280] ? __nf_unregister_net_hook+0x1eb/0x610 [ 76.541813][ T280] report_bug+0x1bd/0x210 [ 76.546532][ T280] handle_bug+0x3c/0x60 [ 76.550880][ T280] exc_invalid_op+0x14/0x40 [ 76.555729][ T280] asm_exc_invalid_op+0x12/0x20 [ 76.560749][ T280] RIP: 0010:__nf_unregister_net_hook+0x1eb/0x610 [ 76.567496][ T280] 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 40 79 6d 8a e8 f0 59 8a 01 <0f> 0b e9 e5 00 00 00 e8 19 64 30 fa 44 8b 3c 24 4c 89 f8 48 c1 e0 [ 76.588510][ T280] RSP: 0018:ffffc90001ccfbc0 EFLAGS: 00010286 [ 76.594584][ T280] RAX: 0000000000000000 RBX: ffff8880204ff400 RCX: 0000000000000000 [ 76.603366][ T280] RDX: ffff888011b63880 RSI: ffffffff815c8ba5 RDI: fffff52000399f6a [ 76.612418][ T280] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 76.620572][ T280] R10: ffffffff815c2a0e R11: 0000000000000000 R12: ffff888025388f20 [ 76.628853][ T280] R13: 0000000000000000 R14: ffff888020496300 R15: 0000000000000001 [ 76.637098][ T280] ? wake_up_klogd.part.0+0x8e/0xd0 [ 76.642305][ T280] ? vprintk+0x95/0x260 [ 76.646469][ T280] nf_unregister_net_hooks+0x117/0x160 [ 76.652120][ T280] arpt_unregister_table_pre_exit+0x67/0x80 [ 76.658304][ T280] ? arptable_filter_net_exit+0x20/0x20 [ 76.664023][ T280] cleanup_net+0x451/0xb10 [ 76.669007][ T280] ? ops_free_list.part.0+0x3d0/0x3d0 [ 76.674578][ T280] process_one_work+0x98d/0x1600 [ 76.679533][ T280] ? pwq_dec_nr_in_flight+0x320/0x320 [ 76.684914][ T280] ? rwlock_bug.part.0+0x90/0x90 [ 76.689856][ T280] ? _raw_spin_lock_irq+0x41/0x50 [ 76.694880][ T280] worker_thread+0x64c/0x1120 [ 76.699660][ T280] ? process_one_work+0x1600/0x1600 [ 76.704856][ T280] kthread+0x3b1/0x4a0 [ 76.708920][ T280] ? __kthread_bind_mask+0xc0/0xc0 [ 76.714219][ T280] ret_from_fork+0x1f/0x30 [ 76.720247][ T280] Kernel Offset: disabled [ 76.724987][ T280] Rebooting in 86400 seconds..