[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. syzkaller login: [ 31.713446] IPVS: ftp: loaded support on port[0] = 21 [ 31.790229] chnl_net:caif_netlink_parms(): no params data found [ 31.882129] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.889678] bridge0: port 1(bridge_slave_0) entered disabled state [ 31.896690] device bridge_slave_0 entered promiscuous mode [ 31.904461] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.911328] bridge0: port 2(bridge_slave_1) entered disabled state [ 31.918950] device bridge_slave_1 entered promiscuous mode [ 31.935609] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 31.945735] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 31.964059] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 31.971698] team0: Port device team_slave_0 added [ 31.977311] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 31.984852] team0: Port device team_slave_1 added [ 31.999807] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 32.007050] 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. [ 32.033267] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 32.044638] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 32.051378] 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. [ 32.078190] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 32.089249] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 32.096599] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 32.116217] device hsr_slave_0 entered promiscuous mode [ 32.122343] device hsr_slave_1 entered promiscuous mode [ 32.128837] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 32.135789] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 32.199475] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.206050] bridge0: port 2(bridge_slave_1) entered forwarding state [ 32.213134] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.219582] bridge0: port 1(bridge_slave_0) entered forwarding state [ 32.254035] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 32.261236] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.269711] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.281025] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.299868] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.307054] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.317657] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 32.324280] 8021q: adding VLAN 0 to HW filter on device team0 [ 32.333644] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 32.341951] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.348593] bridge0: port 1(bridge_slave_0) entered forwarding state [ 32.358588] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 32.366556] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.372988] bridge0: port 2(bridge_slave_1) entered forwarding state [ 32.387319] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 32.395749] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 32.405795] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 32.416271] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 32.426103] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 32.435413] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 32.441737] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 32.455095] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 32.463368] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 32.470999] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 32.482377] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 32.534700] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 32.544747] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 32.574027] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 32.582205] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 32.589823] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 32.600048] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 32.608066] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 32.615258] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 32.624153] device veth0_vlan entered promiscuous mode [ 32.633058] device veth1_vlan entered promiscuous mode [ 32.639388] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 32.647955] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 32.659052] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 32.668179] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 32.675339] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 32.682728] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 32.692092] device veth0_macvtap entered promiscuous mode [ 32.698918] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 32.706701] device veth1_macvtap entered promiscuous mode [ 32.715629] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 32.726169] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 32.735942] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 32.742686] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 32.750876] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 32.760801] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 32.767448] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 32.776068] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready executing program [ 32.864174] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.870942] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.895680] batman_adv: batadv0: Interface deactivated: batadv_slave_0 [ 32.904489] batman_adv: batadv0: Interface deactivated: batadv_slave_1 [ 32.940641] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 32.947292] IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready [ 32.954522] IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready [ 32.962956] 8021q: adding VLAN 0 to HW filter on device bond0 [ 32.970142] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 32.976196] 8021q: adding VLAN 0 to HW filter on device team0 executing program [ 32.984695] A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. [ 33.001859] syz-executor242 (8215) used greatest stack depth: 24952 bytes left [ 33.002778] skbuff: skb_over_panic: text:ffffffff8658ed5f len:40 put:40 head:ffff888097641040 data:ffff8880976410f0 tail:0xd8 end:0xc0 dev:ip6gre0 [ 33.022845] ------------[ cut here ]------------ [ 33.027591] kernel BUG at net/core/skbuff.c:104! [ 33.032400] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 33.037791] Modules linked in: [ 33.040964] CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.14.215-syzkaller #0 [ 33.048208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.057548] Workqueue: ipv6_addrconf addrconf_dad_work [ 33.062804] task: ffff8880b5fdc0c0 task.stack: ffff8880b5fe0000 [ 33.068854] RIP: 0010:skb_panic+0x172/0x174 [ 33.073160] RSP: 0018:ffff8880b5fe78d0 EFLAGS: 00010282 [ 33.078512] RAX: 0000000000000086 RBX: ffff8880b3ddcdc0 RCX: 0000000000000000 [ 33.085757] RDX: 0000000000000000 RSI: ffffffff878bbb40 RDI: ffffed1016bfcf10 [ 33.093013] RBP: ffffffff885550a0 R08: 0000000000000086 R09: 0000000000000000 [ 33.100257] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8658ed5f [ 33.107501] R13: 0000000000000028 R14: ffff8880b1a74440 R15: 00000000000000c0 [ 33.114767] FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 33.122982] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.128836] CR2: 00007f68b057b000 CR3: 00000000a19fd000 CR4: 00000000001406f0 [ 33.136080] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.143325] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.150567] Call Trace: [ 33.153137] ? ip6_mc_hdr.constprop.0+0x11f/0x580 [ 33.157955] skb_put.cold+0x24/0x24 [ 33.161560] ip6_mc_hdr.constprop.0+0x11f/0x580 [ 33.166202] mld_newpack+0x3aa/0x720 [ 33.169891] ? ip6_mc_hdr.constprop.0+0x580/0x580 [ 33.174709] ? trace_hardirqs_on+0x10/0x10 [ 33.178919] add_grhead+0x265/0x330 [ 33.182520] add_grec+0xc40/0xed0 [ 33.185947] ? ip6_route_info_create+0x28b0/0x28b0 [ 33.190852] ? add_grhead+0x330/0x330 [ 33.194627] mld_send_initial_cr.part.0+0xb0/0x140 [ 33.199543] ipv6_mc_dad_complete+0x183/0x5a0 [ 33.204012] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 33.209011] addrconf_dad_completed+0x80f/0xa40 [ 33.213668] ? addrconf_rs_timer+0x5a0/0x5a0 [ 33.218061] ? __local_bh_enable_ip+0xc1/0x170 [ 33.222617] addrconf_dad_work+0x673/0xef0 [ 33.226824] ? lock_acquire+0x170/0x3f0 [ 33.230777] ? addrconf_dad_completed+0xa40/0xa40 [ 33.235597] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 33.241022] process_one_work+0x793/0x14a0 [ 33.245246] ? work_busy+0x320/0x320 [ 33.248930] ? worker_thread+0x158/0xff0 [ 33.252967] ? _raw_spin_unlock_irq+0x24/0x80 [ 33.257444] worker_thread+0x5cc/0xff0 [ 33.261331] ? rescuer_thread+0xc80/0xc80 [ 33.265460] kthread+0x30d/0x420 [ 33.268798] ? kthread_create_on_node+0xd0/0xd0 [ 33.273442] ret_from_fork+0x24/0x30 [ 33.277130] Code: 8b 4c 24 10 8b 8b 80 00 00 00 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 40 49 55 88 ff 74 24 10 ff 74 24 20 e8 a5 1e 6a fb <0f> 0b e8 cd 91 7b fb 4c 8b 64 24 18 e8 83 67 a5 fb 48 c7 c1 60 [ 33.296237] RIP: skb_panic+0x172/0x174 RSP: ffff8880b5fe78d0 [ 33.302111] ---[ end trace 9001bf97ecdca4ff ]--- [ 33.306862] Kernel panic - not syncing: Fatal exception in interrupt [ 33.313795] Kernel Offset: disabled [ 33.317405] Rebooting in 86400 seconds..