WARNING in __nf_unregister_net_hook ------------[ cut here ]------------ hook not found, pf 3 num 0 WARNING: CPU: 1 PID: 308 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x4ee/0x640 net/netfilter/core.c:480 Modules linked in: CPU: 1 PID: 308 Comm: kworker/u4:6 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+0x4ee/0x640 net/netfilter/core.c:480 Code: c6 05 f9 0e 34 05 01 43 8a 04 2e 84 c0 0f 85 3a 01 00 00 48 8b 04 24 8b 10 48 c7 c7 00 65 d6 8a 44 89 e6 31 c0 e8 e2 96 78 f9 <0f> 0b e9 08 ff ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 3d RSP: 0018:ffffc90001e1fbd8 EFLAGS: 00010246 RAX: 130bfab82e863e00 RBX: ffff888019f77380 RCX: 130bfab82e863e00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffff888031778f20 R08: ffffffff81603612 R09: ffffed10173e3f24 R10: ffffed10173e3f24 R11: 0000000000000000 R12: 0000000000000003 R13: dffffc0000000000 R14: 1ffff110288ca843 R15: ffff888031778000 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff54d933000 CR3: 000000002cf06000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nf_unregister_net_hook net/netfilter/core.c:498 [inline] nf_unregister_net_hooks+0xe7/0x150 net/netfilter/core.c:576 ops_pre_exit_list net/core/net_namespace.c:165 [inline] cleanup_net+0x5b8/0xbd0 net/core/net_namespace.c:583 process_one_work+0x789/0xfd0 kernel/workqueue.c:2275 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Starting getty on tty2-tty6 if dbus and logind are not available... [ OK ] Started Daily apt download activities. [ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. [ OK ] Started Permit User Sessions. [ OK ] Started Getty on tty1. [ OK ] Started System Logging Service. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. 2021/05/07 18:38:31 fuzzer started 2021/05/07 18:38:32 connecting to host at 10.128.0.169:34847 2021/05/07 18:38:32 checking machine... 2021/05/07 18:38:32 checking revisions... 2021/05/07 18:38:32 testing simple program... syzkaller login: [ 48.084197][ T8423] chnl_net:caif_netlink_parms(): no params data found [ 48.136898][ T8423] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.146030][ T8423] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.154429][ T8423] device bridge_slave_0 entered promiscuous mode [ 48.164531][ T8423] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.171995][ T8423] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.180535][ T8423] device bridge_slave_1 entered promiscuous mode [ 48.199837][ T8423] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 48.211072][ T8423] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 48.232417][ T8423] team0: Port device team_slave_0 added [ 48.240144][ T8423] team0: Port device team_slave_1 added [ 48.256477][ T8423] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 48.263564][ T8423] 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. [ 48.290582][ T8423] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 48.303282][ T8423] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 48.310853][ T8423] 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. [ 48.337551][ T8423] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 48.358108][ T8423] device hsr_slave_0 entered promiscuous mode [ 48.365130][ T8423] device hsr_slave_1 entered promiscuous mode [ 48.461403][ T8423] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 48.472157][ T8423] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 48.481902][ T8423] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 48.491682][ T8423] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 48.513843][ T8423] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.521167][ T8423] bridge0: port 2(bridge_slave_1) entered forwarding state [ 48.529075][ T8423] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.536205][ T8423] bridge0: port 1(bridge_slave_0) entered forwarding state [ 48.574673][ T8423] 8021q: adding VLAN 0 to HW filter on device bond0 [ 48.589187][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 48.600962][ T7] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.611033][ T7] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.619485][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 48.632671][ T8423] 8021q: adding VLAN 0 to HW filter on device team0 [ 48.645863][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 48.654318][ T8643] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.661714][ T8643] bridge0: port 1(bridge_slave_0) entered forwarding state [ 48.673625][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 48.682706][ T3817] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.690791][ T3817] bridge0: port 2(bridge_slave_1) entered forwarding state [ 48.709734][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 48.719081][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 48.738901][ T8645] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 48.748380][ T8645] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 48.757725][ T8645] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 48.770079][ T8423] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 48.788936][ T8645] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 48.797102][ T8645] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 48.809172][ T8423] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 48.828456][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 48.847902][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 48.857230][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 48.865311][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 48.875561][ T8423] device veth0_vlan entered promiscuous mode [ 48.890122][ T8423] device veth1_vlan entered promiscuous mode [ 48.910037][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 48.918903][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 48.928105][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 48.938637][ T8423] device veth0_macvtap entered promiscuous mode [ 48.950031][ T8423] device veth1_macvtap entered promiscuous mode [ 48.966930][ T8423] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 48.975858][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 48.986869][ T8643] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 49.000097][ T8423] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 49.008592][ T8645] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 49.021568][ T8423] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 49.032064][ T8423] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 49.041676][ T8423] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 49.050582][ T8423] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 49.122452][ T308] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 49.145962][ T308] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 49.160414][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 49.180968][ T195] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 49.191119][ T195] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 49.201963][ T3817] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready 2021/05/07 18:38:34 building call list... executing program [ 49.711972][ T308] ------------[ cut here ]------------ [ 49.726205][ T308] hook not found, pf 3 num 0 [ 49.726588][ T308] WARNING: CPU: 1 PID: 308 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x4ee/0x640 [ 49.743943][ T308] Modules linked in: [ 49.750278][ T308] CPU: 1 PID: 308 Comm: kworker/u4:6 Not tainted 5.12.0-syzkaller #0 [ 49.760075][ T308] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.775341][ T308] Workqueue: netns cleanup_net [ 49.780300][ T308] RIP: 0010:__nf_unregister_net_hook+0x4ee/0x640 [ 49.788520][ T308] Code: c6 05 f9 0e 34 05 01 43 8a 04 2e 84 c0 0f 85 3a 01 00 00 48 8b 04 24 8b 10 48 c7 c7 00 65 d6 8a 44 89 e6 31 c0 e8 e2 96 78 f9 <0f> 0b e9 08 ff ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 3d [ 49.812270][ T308] RSP: 0018:ffffc90001e1fbd8 EFLAGS: 00010246 [ 49.819816][ T308] RAX: 130bfab82e863e00 RBX: ffff888019f77380 RCX: 130bfab82e863e00 [ 49.830460][ T308] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 49.839600][ T308] RBP: ffff888031778f20 R08: ffffffff81603612 R09: ffffed10173e3f24 [ 49.850563][ T308] R10: ffffed10173e3f24 R11: 0000000000000000 R12: 0000000000000003 [ 49.859886][ T308] R13: dffffc0000000000 R14: 1ffff110288ca843 R15: ffff888031778000 [ 49.870323][ T308] FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 49.880514][ T308] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.890783][ T308] CR2: 00007ff54d933000 CR3: 000000002cf06000 CR4: 00000000001506e0 [ 49.900506][ T308] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.911534][ T308] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.920735][ T308] Call Trace: [ 49.924052][ T308] nf_unregister_net_hooks+0xe7/0x150 [ 49.932431][ T308] cleanup_net+0x5b8/0xbd0 [ 49.938216][ T308] process_one_work+0x789/0xfd0 [ 49.943476][ T308] worker_thread+0xac1/0x1300 [ 49.951172][ T308] ? __kthread_parkme+0x148/0x190 [ 49.957231][ T308] ? rcu_lock_release+0x20/0x20 [ 49.962155][ T308] kthread+0x39a/0x3c0 [ 49.970197][ T308] ? rcu_lock_release+0x20/0x20 [ 49.976315][ T308] ? kthread_blkcg+0xd0/0xd0 [ 49.981047][ T308] ret_from_fork+0x1f/0x30 [ 49.988729][ T308] Kernel panic - not syncing: panic_on_warn set ... [ 49.995440][ T308] CPU: 1 PID: 308 Comm: kworker/u4:6 Not tainted 5.12.0-syzkaller #0 [ 50.003547][ T308] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.013708][ T308] Workqueue: netns cleanup_net [ 50.018905][ T308] Call Trace: [ 50.022202][ T308] dump_stack+0x125/0x19e [ 50.026560][ T308] panic+0x291/0x800 [ 50.030472][ T308] ? __warn+0x13e/0x270 [ 50.034649][ T308] __warn+0x26a/0x270 [ 50.038648][ T308] ? __nf_unregister_net_hook+0x4ee/0x640 [ 50.044384][ T308] ? __nf_unregister_net_hook+0x4ee/0x640 [ 50.050144][ T308] report_bug+0x1b1/0x2e0 [ 50.054503][ T308] handle_bug+0x3d/0x70 [ 50.058669][ T308] exc_invalid_op+0x16/0x40 [ 50.063168][ T308] asm_exc_invalid_op+0x12/0x20 [ 50.068023][ T308] RIP: 0010:__nf_unregister_net_hook+0x4ee/0x640 [ 50.074359][ T308] Code: c6 05 f9 0e 34 05 01 43 8a 04 2e 84 c0 0f 85 3a 01 00 00 48 8b 04 24 8b 10 48 c7 c7 00 65 d6 8a 44 89 e6 31 c0 e8 e2 96 78 f9 <0f> 0b e9 08 ff ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 3d [ 50.094079][ T308] RSP: 0018:ffffc90001e1fbd8 EFLAGS: 00010246 [ 50.100677][ T308] RAX: 130bfab82e863e00 RBX: ffff888019f77380 RCX: 130bfab82e863e00 [ 50.108750][ T308] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 50.116785][ T308] RBP: ffff888031778f20 R08: ffffffff81603612 R09: ffffed10173e3f24 [ 50.124765][ T308] R10: ffffed10173e3f24 R11: 0000000000000000 R12: 0000000000000003 [ 50.132835][ T308] R13: dffffc0000000000 R14: 1ffff110288ca843 R15: ffff888031778000 [ 50.140841][ T308] ? wake_up_klogd+0xb2/0xf0 [ 50.145452][ T308] ? __nf_unregister_net_hook+0x4ee/0x640 [ 50.151195][ T308] nf_unregister_net_hooks+0xe7/0x150 [ 50.156580][ T308] cleanup_net+0x5b8/0xbd0 [ 50.161033][ T308] process_one_work+0x789/0xfd0 [ 50.165918][ T308] worker_thread+0xac1/0x1300 [ 50.170773][ T308] ? __kthread_parkme+0x148/0x190 [ 50.175815][ T308] ? rcu_lock_release+0x20/0x20 [ 50.180771][ T308] kthread+0x39a/0x3c0 [ 50.184858][ T308] ? rcu_lock_release+0x20/0x20 [ 50.189712][ T308] ? kthread_blkcg+0xd0/0xd0 [ 50.194309][ T308] ret_from_fork+0x1f/0x30 [ 50.200540][ T308] Kernel Offset: disabled [ 50.205082][ T308] Rebooting in 86400 seconds..