[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.42' (ECDSA) to the list of known hosts. 2021/05/04 23:23:22 fuzzer started 2021/05/04 23:23:22 connecting to host at 10.128.0.169:46353 2021/05/04 23:23:22 checking machine... 2021/05/04 23:23:22 checking revisions... 2021/05/04 23:23:22 testing simple program... syzkaller login: [ 55.145632][ T8408] chnl_net:caif_netlink_parms(): no params data found [ 55.203974][ T8408] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.213805][ T8408] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.222583][ T8408] device bridge_slave_0 entered promiscuous mode [ 55.234555][ T8408] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.243674][ T8408] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.252268][ T8408] device bridge_slave_1 entered promiscuous mode [ 55.275072][ T8408] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 55.289214][ T8408] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 55.314270][ T8408] team0: Port device team_slave_0 added [ 55.321918][ T8408] team0: Port device team_slave_1 added [ 55.339809][ T8408] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 55.347904][ T8408] 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. [ 55.377984][ T8408] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 55.393734][ T8408] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 55.401677][ T8408] 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. [ 55.429496][ T8408] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 55.457745][ T8408] device hsr_slave_0 entered promiscuous mode [ 55.466577][ T8408] device hsr_slave_1 entered promiscuous mode [ 55.571331][ T8408] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 55.585950][ T8408] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 55.596607][ T8408] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 55.607716][ T8408] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 55.632501][ T8408] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.640772][ T8408] bridge0: port 2(bridge_slave_1) entered forwarding state [ 55.649151][ T8408] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.656783][ T8408] bridge0: port 1(bridge_slave_0) entered forwarding state [ 55.700899][ T8408] 8021q: adding VLAN 0 to HW filter on device bond0 [ 55.717874][ T4808] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 55.729270][ T4808] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.739324][ T4808] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.748506][ T4808] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 55.763529][ T8408] 8021q: adding VLAN 0 to HW filter on device team0 [ 55.776041][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 55.785256][ T4844] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.793032][ T4844] bridge0: port 1(bridge_slave_0) entered forwarding state [ 55.806211][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 55.817112][ T4548] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.826518][ T4548] bridge0: port 2(bridge_slave_1) entered forwarding state [ 55.846893][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 55.857077][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 55.869542][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 55.885506][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 55.898120][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 55.910437][ T8408] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 55.929360][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 55.937206][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 55.949919][ T8408] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 55.969559][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 55.989586][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 55.999914][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 56.009227][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 56.021512][ T8408] device veth0_vlan entered promiscuous mode [ 56.035666][ T8408] device veth1_vlan entered promiscuous mode [ 56.058456][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 56.067991][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 56.078403][ T4844] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 56.090253][ T8408] device veth0_macvtap entered promiscuous mode [ 56.105905][ T8408] device veth1_macvtap entered promiscuous mode [ 56.125134][ T8408] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 56.133558][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 56.144031][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 56.158031][ T8408] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 56.169012][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 56.179485][ T4548] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 56.192970][ T8408] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 56.207244][ T8408] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 56.219754][ T8408] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 56.229981][ T8408] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 56.318656][ T104] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 56.328209][ T104] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 56.350660][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 56.380010][ T104] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 56.389468][ T104] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 56.401024][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready executing program 2021/05/04 23:23:25 building call list... [ 57.091052][ T104] ------------[ cut here ]------------ [ 57.109894][ T104] hook not found, pf 3 num 0 [ 57.110822][ T104] WARNING: CPU: 0 PID: 104 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x4ee/0x640 [ 57.132049][ T104] Modules linked in: [ 57.142120][ T104] CPU: 0 PID: 104 Comm: kworker/u4:3 Not tainted 5.12.0-syzkaller #0 [ 57.157501][ T104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.170002][ T104] Workqueue: netns cleanup_net [ 57.177489][ T104] RIP: 0010:__nf_unregister_net_hook+0x4ee/0x640 [ 57.186392][ T104] Code: c6 05 d7 f0 03 06 01 43 8a 04 2e 84 c0 0f 85 3a 01 00 00 48 8b 04 24 8b 10 48 c7 c7 80 89 59 8b 44 89 e6 31 c0 e8 52 8c 2a f9 <0f> 0b e9 08 ff ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 3d [ 57.211710][ T104] RSP: 0018:ffffc9000127fad8 EFLAGS: 00010246 [ 57.219122][ T104] RAX: 4b80373cf58a1a00 RBX: ffff888029db8200 RCX: ffff8880159a3880 [ 57.243579][ T104] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 57.251929][ T104] RBP: ffff888035ac8f20 R08: ffffffff81652212 R09: ffffed1017343f24 [ 57.264039][ T104] R10: ffffed1017343f24 R11: 0000000000000000 R12: 0000000000000003 [ 57.273649][ T104] R13: dffffc0000000000 R14: 1ffff11028f717e3 R15: ffff888035ac8000 [ 57.283994][ T104] FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 [ 57.295494][ T104] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.302414][ T104] CR2: 000000c001000000 CR3: 0000000015db0000 CR4: 00000000001506e0 [ 57.313983][ T104] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.324119][ T104] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.332485][ T104] Call Trace: [ 57.338110][ T104] nf_unregister_net_hooks+0xe7/0x150 [ 57.346563][ T104] cleanup_net+0x608/0xc60 [ 57.351127][ T104] ? ops_free_list+0x380/0x380 [ 57.357413][ T104] ? _raw_spin_unlock_irq+0x1f/0x40 [ 57.365784][ T104] process_one_work+0x833/0x10c0 [ 57.371676][ T104] ? worker_detach_from_pool+0x260/0x260 [ 57.379624][ T104] ? _raw_spin_lock_irqsave+0x100/0x100 [ 57.388087][ T104] ? kthread_data+0x4d/0xc0 [ 57.394744][ T104] ? wq_worker_running+0x8b/0x140 [ 57.400652][ T104] worker_thread+0xac1/0x1300 [ 57.408623][ T104] ? rcu_lock_release+0x20/0x20 [ 57.415030][ T104] kthread+0x39a/0x3c0 [ 57.419403][ T104] ? rcu_lock_release+0x20/0x20 [ 57.427636][ T104] ? kthread_blkcg+0xd0/0xd0 [ 57.432389][ T104] ret_from_fork+0x1f/0x30 [ 57.439150][ T104] Kernel panic - not syncing: panic_on_warn set ... [ 57.446044][ T104] CPU: 1 PID: 104 Comm: kworker/u4:3 Not tainted 5.12.0-syzkaller #0 [ 57.454753][ T104] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.465098][ T104] Workqueue: netns cleanup_net [ 57.470354][ T104] Call Trace: [ 57.473685][ T104] dump_stack+0x202/0x31e [ 57.478350][ T104] ? show_regs_print_info+0x12/0x12 [ 57.483832][ T104] ? log_buf_vmcoreinfo_setup+0x498/0x498 [ 57.490077][ T104] ? preempt_count_add+0x66/0x130 [ 57.496153][ T104] panic+0x2e1/0x850 [ 57.503717][ T104] ? __warn+0x13e/0x270 [ 57.509940][ T104] ? nmi_panic+0x90/0x90 [ 57.517176][ T104] ? ret_from_fork+0x1f/0x30 [ 57.524737][ T104] __warn+0x26a/0x270 [ 57.530722][ T104] ? __nf_unregister_net_hook+0x4ee/0x640 [ 57.537066][ T104] ? __nf_unregister_net_hook+0x4ee/0x640 [ 57.544021][ T104] report_bug+0x1b1/0x2e0 [ 57.548734][ T104] handle_bug+0x3d/0x70 [ 57.552901][ T104] exc_invalid_op+0x16/0x40 [ 57.557522][ T104] asm_exc_invalid_op+0x12/0x20 [ 57.562657][ T104] RIP: 0010:__nf_unregister_net_hook+0x4ee/0x640 [ 57.569186][ T104] Code: c6 05 d7 f0 03 06 01 43 8a 04 2e 84 c0 0f 85 3a 01 00 00 48 8b 04 24 8b 10 48 c7 c7 80 89 59 8b 44 89 e6 31 c0 e8 52 8c 2a f9 <0f> 0b e9 08 ff ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c 3d [ 57.590526][ T104] RSP: 0018:ffffc9000127fad8 EFLAGS: 00010246 [ 57.597151][ T104] RAX: 4b80373cf58a1a00 RBX: ffff888029db8200 RCX: ffff8880159a3880 [ 57.607132][ T104] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 [ 57.615917][ T104] RBP: ffff888035ac8f20 R08: ffffffff81652212 R09: ffffed1017343f24 [ 57.624273][ T104] R10: ffffed1017343f24 R11: 0000000000000000 R12: 0000000000000003 [ 57.633291][ T104] R13: dffffc0000000000 R14: 1ffff11028f717e3 R15: ffff888035ac8000 [ 57.643128][ T104] ? wake_up_klogd+0xb2/0xf0 [ 57.648227][ T104] ? __nf_unregister_net_hook+0x4ee/0x640 [ 57.655270][ T104] nf_unregister_net_hooks+0xe7/0x150 [ 57.661597][ T104] cleanup_net+0x608/0xc60 [ 57.666430][ T104] ? ops_free_list+0x380/0x380 [ 57.672255][ T104] ? _raw_spin_unlock_irq+0x1f/0x40 [ 57.678734][ T104] process_one_work+0x833/0x10c0 [ 57.684413][ T104] ? worker_detach_from_pool+0x260/0x260 [ 57.690522][ T104] ? _raw_spin_lock_irqsave+0x100/0x100 [ 57.696073][ T104] ? kthread_data+0x4d/0xc0 [ 57.701232][ T104] ? wq_worker_running+0x8b/0x140 [ 57.707412][ T104] worker_thread+0xac1/0x1300 [ 57.712318][ T104] ? rcu_lock_release+0x20/0x20 [ 57.717267][ T104] kthread+0x39a/0x3c0 [ 57.721612][ T104] ? rcu_lock_release+0x20/0x20 [ 57.728155][ T104] ? kthread_blkcg+0xd0/0xd0 [ 57.732869][ T104] ret_from_fork+0x1f/0x30 [ 57.739935][ T104] Kernel Offset: disabled [ 57.745434][ T104] Rebooting in 86400 seconds..