Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.218' (ECDSA) to the list of known hosts. syzkaller login: [ 54.353106][ T6834] IPVS: ftp: loaded support on port[0] = 21 [ 54.436570][ T6834] chnl_net:caif_netlink_parms(): no params data found [ 54.486774][ T6834] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.494175][ T6834] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.501797][ T6834] device bridge_slave_0 entered promiscuous mode [ 54.511935][ T6834] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.519125][ T6834] bridge0: port 2(bridge_slave_1) entered disabled state [ 54.527420][ T6834] device bridge_slave_1 entered promiscuous mode [ 54.547000][ T6834] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 54.557577][ T6834] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 54.579519][ T6834] team0: Port device team_slave_0 added [ 54.587118][ T6834] team0: Port device team_slave_1 added [ 54.603914][ T6834] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 54.610860][ T6834] 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. [ 54.636884][ T6834] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 54.649747][ T6834] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 54.656751][ T6834] 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. [ 54.682680][ T6834] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 54.709019][ T6834] device hsr_slave_0 entered promiscuous mode [ 54.715720][ T6834] device hsr_slave_1 entered promiscuous mode [ 54.805796][ T6834] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 54.816295][ T6834] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 54.826859][ T6834] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 54.836577][ T6834] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 54.858639][ T6834] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.865763][ T6834] bridge0: port 2(bridge_slave_1) entered forwarding state [ 54.873246][ T6834] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.880483][ T6834] bridge0: port 1(bridge_slave_0) entered forwarding state [ 54.922156][ T6834] 8021q: adding VLAN 0 to HW filter on device bond0 [ 54.935422][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 54.945277][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.953136][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 54.962154][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 54.975938][ T6834] 8021q: adding VLAN 0 to HW filter on device team0 [ 54.986795][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 54.995934][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.002960][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 55.025850][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 55.035351][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.042373][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 55.050733][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 55.059668][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 55.075656][ T6834] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 55.087028][ T6834] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 55.099634][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 55.107874][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 55.116631][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 55.125214][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 55.142951][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 55.150975][ T23] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 55.166995][ T6834] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 55.185512][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 55.205988][ T2614] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 55.214719][ T2614] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 55.222252][ T2614] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 55.231567][ T6834] device veth0_vlan entered promiscuous mode [ 55.245277][ T6834] device veth1_vlan entered promiscuous mode [ 55.264743][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 55.272618][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 55.282572][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 55.293343][ T6834] device veth0_macvtap entered promiscuous mode [ 55.303710][ T6834] device veth1_macvtap entered promiscuous mode [ 55.320672][ T6834] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 55.329984][ T2614] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 55.340109][ T2614] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 55.352083][ T6834] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 55.360273][ T7041] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 55.371706][ T6834] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 55.381201][ T6834] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 55.390153][ T6834] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 55.399623][ T6834] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 55.441927][ T6834] IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready [ 55.450935][ T6834] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 55.458397][ T6834] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 55.473425][ C0] ------------[ cut here ]------------ [ 55.479003][ C0] Illegal XDP return value 4294967274, expect packet loss! [ 55.486522][ C0] WARNING: CPU: 0 PID: 2602 at net/core/filter.c:7193 bpf_warn_invalid_xdp_action+0x6f/0x80 [ 55.496614][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 55.503189][ C0] CPU: 0 PID: 2602 Comm: kworker/0:2 Not tainted 5.9.0-rc1-next-20200819-syzkaller #0 [ 55.512709][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.522763][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 55.529137][ C0] Call Trace: [ 55.532432][ C0] [ 55.535263][ C0] dump_stack+0x18f/0x20d [ 55.539570][ C0] panic+0x2e3/0x75c [ 55.543441][ C0] ? __warn_printk+0xf3/0xf3 [ 55.548006][ C0] ? __warn.cold+0x5/0x4a [ 55.552306][ C0] ? __warn+0xd6/0x1f2 [ 55.556354][ C0] ? bpf_warn_invalid_xdp_action+0x6f/0x80 [ 55.562175][ C0] __warn.cold+0x20/0x4a [ 55.566392][ C0] ? bpf_warn_invalid_xdp_action+0x6f/0x80 [ 55.572211][ C0] report_bug+0x1bd/0x210 [ 55.576521][ C0] handle_bug+0x38/0x90 [ 55.580649][ C0] exc_invalid_op+0x14/0x40 [ 55.585127][ C0] asm_exc_invalid_op+0x12/0x20 [ 55.589952][ C0] RIP: 0010:bpf_warn_invalid_xdp_action+0x6f/0x80 [ 55.596394][ C0] Code: 80 e5 ff 88 41 83 fc 04 48 c7 c6 c0 e5 ff 88 48 0f 46 ee e8 63 ca 2d fb 44 89 e2 48 c7 c7 00 e6 ff 88 48 89 ee e8 93 aa fe fa <0f> 0b 5b 5d 41 5c e9 46 ca 2d fb 66 0f 1f 44 00 00 41 57 41 56 49 [ 55.616111][ C0] RSP: 0018:ffffc90000007a88 EFLAGS: 00010282 [ 55.622153][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 55.630100][ C0] RDX: ffff88809f076100 RSI: ffffffff815d90e7 RDI: fffff52000000f43 [ 55.638067][ C0] RBP: ffffffff88ffe580 R08: 0000000000000001 R09: ffff8880ae6318e7 [ 55.646063][ C0] R10: 0000000000000000 R11: 206c6167656c6c49 R12: 00000000ffffffea [ 55.654014][ C0] R13: 0000000000000001 R14: 000000000000dd86 R15: ffffc90000007c78 [ 55.662022][ C0] ? vprintk_func+0x97/0x1a6 [ 55.666596][ C0] ? bpf_warn_invalid_xdp_action+0x6f/0x80 [ 55.672428][ C0] netif_receive_generic_xdp+0xe58/0x1760 [ 55.678125][ C0] ? lock_is_held_type+0xbb/0xf0 [ 55.683041][ C0] __netif_receive_skb_core+0x11ee/0x3690 [ 55.688740][ C0] ? mark_lock+0x40/0x1710 [ 55.693134][ C0] ? generic_xdp_tx+0x710/0x710 [ 55.697963][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 55.703920][ C0] ? lock_acquire+0x1f1/0xad0 [ 55.708576][ C0] __netif_receive_skb_one_core+0xae/0x180 [ 55.714357][ C0] ? __netif_receive_skb_core+0x3690/0x3690 [ 55.720224][ C0] ? mark_held_locks+0x9f/0xe0 [ 55.724959][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 55.729875][ C0] __netif_receive_skb+0x27/0x1c0 [ 55.734872][ C0] process_backlog+0x28d/0x7f0 [ 55.739611][ C0] net_rx_action+0x4a1/0xe80 [ 55.744175][ C0] ? napi_complete_done+0x860/0x860 [ 55.749347][ C0] ? mark_held_locks+0x9f/0xe0 [ 55.754081][ C0] ? sched_clock_cpu+0x18/0x1b0 [ 55.758905][ C0] ? lock_is_held_type+0xbb/0xf0 [ 55.763816][ C0] __do_softirq+0x2de/0xa24 [ 55.768295][ C0] asm_call_on_stack+0xf/0x20 [ 55.772941][ C0] [ 55.775875][ C0] do_softirq_own_stack+0x9d/0xd0 [ 55.780880][ C0] do_softirq+0x17b/0x1e0 [ 55.785191][ C0] ? ip6_finish_output2+0x8ef/0x17b0 [ 55.790453][ C0] __local_bh_enable_ip+0x14d/0x190 [ 55.795630][ C0] ip6_finish_output2+0x91d/0x17b0 [ 55.800725][ C0] __ip6_finish_output+0x447/0xab0 [ 55.805818][ C0] ip6_finish_output+0x34/0x1f0 [ 55.810646][ C0] ip6_output+0x1db/0x520 [ 55.814954][ C0] ndisc_send_skb+0xa69/0x1720 [ 55.819704][ C0] ? ndisc_ifinfo_sysctl_change+0x5c0/0x5c0 [ 55.825575][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 55.831395][ C0] ? ndisc_parse_options.part.0+0x480/0x480 [ 55.837267][ C0] ? __alloc_skb+0x34a/0x550 [ 55.841832][ C0] ? skb_set_owner_w+0x24e/0x400 [ 55.846788][ C0] ndisc_send_ns+0x3a9/0x850 [ 55.851356][ C0] ? pndisc_redo+0x20/0x20 [ 55.855786][ C0] ? __local_bh_enable_ip+0xd1/0x190 [ 55.861045][ C0] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 55.866998][ C0] ? addrconf_dad_work+0xb4f/0x1280 [ 55.872173][ C0] ? trace_hardirqs_on+0x5f/0x220 [ 55.877194][ C0] addrconf_dad_work+0xc1c/0x1280 [ 55.882195][ C0] ? addrconf_dad_completed+0xcd0/0xcd0 [ 55.887737][ C0] ? lock_is_held_type+0xbb/0xf0 [ 55.892650][ C0] process_one_work+0x94c/0x1670 [ 55.897567][ C0] ? lock_release+0x8e0/0x8e0 [ 55.902217][ C0] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 55.907566][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 55.912496][ C0] worker_thread+0x64c/0x1120 [ 55.917153][ C0] ? __kthread_parkme+0x13f/0x1e0 [ 55.922150][ C0] ? process_one_work+0x1670/0x1670 [ 55.927324][ C0] kthread+0x3b5/0x4a0 [ 55.931365][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 55.936449][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 55.941537][ C0] ret_from_fork+0x1f/0x30 [ 55.947141][ C0] Kernel Offset: disabled [ 55.951517][ C0] Rebooting in 86400 seconds..