[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. syzkaller login: [ 32.456539] audit: type=1400 audit(1601685558.007:8): avc: denied { execmem } for pid=6358 comm="syz-executor579" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 32.479317] IPVS: ftp: loaded support on port[0] = 21 [ 32.554966] chnl_net:caif_netlink_parms(): no params data found [ 32.635386] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.642123] bridge0: port 1(bridge_slave_0) entered disabled state [ 32.650410] device bridge_slave_0 entered promiscuous mode [ 32.657346] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.664867] bridge0: port 2(bridge_slave_1) entered disabled state [ 32.672159] device bridge_slave_1 entered promiscuous mode [ 32.688915] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 32.698353] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 32.716621] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 32.724168] team0: Port device team_slave_0 added [ 32.730409] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 32.737448] team0: Port device team_slave_1 added [ 32.752606] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 32.758910] 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. [ 32.784782] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 32.796523] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 32.803195] 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. [ 32.828887] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 32.840368] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 32.848880] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 32.866841] device hsr_slave_0 entered promiscuous mode [ 32.872946] device hsr_slave_1 entered promiscuous mode [ 32.879229] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 32.886283] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 32.947306] bridge0: port 2(bridge_slave_1) entered blocking state [ 32.953773] bridge0: port 2(bridge_slave_1) entered forwarding state [ 32.960777] bridge0: port 1(bridge_slave_0) entered blocking state [ 32.967136] bridge0: port 1(bridge_slave_0) entered forwarding state [ 32.996080] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 33.003014] 8021q: adding VLAN 0 to HW filter on device bond0 [ 33.011473] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.020594] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.040567] bridge0: port 1(bridge_slave_0) entered disabled state [ 33.058653] bridge0: port 2(bridge_slave_1) entered disabled state [ 33.069361] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 33.075526] 8021q: adding VLAN 0 to HW filter on device team0 [ 33.084336] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 33.092196] bridge0: port 1(bridge_slave_0) entered blocking state [ 33.098601] bridge0: port 1(bridge_slave_0) entered forwarding state [ 33.108748] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 33.116474] bridge0: port 2(bridge_slave_1) entered blocking state [ 33.122900] bridge0: port 2(bridge_slave_1) entered forwarding state [ 33.136039] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 33.144904] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 33.154229] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 33.168972] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 33.179451] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 33.191118] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 33.198220] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 33.206210] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 33.214145] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 33.225497] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 33.233761] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 33.241026] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 33.251177] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 33.303845] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 33.313820] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 33.342237] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 33.349986] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 33.356392] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 33.366254] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 33.374204] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 33.381605] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 33.391129] device veth0_vlan entered promiscuous mode [ 33.400342] device veth1_vlan entered promiscuous mode [ 33.406141] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 33.414868] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 33.426321] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 33.436051] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 33.443779] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 33.451455] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 33.461780] device veth0_macvtap entered promiscuous mode [ 33.468527] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 33.476441] device veth1_macvtap entered promiscuous mode [ 33.485241] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 33.494547] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 33.504429] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 33.512250] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 33.520706] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 33.529077] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 33.538655] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready [ 33.545549] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 33.553456] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 33.561480] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 33.652264] bridge0: port 2(bridge_slave_1) entered disabled state [ 33.659280] bridge0: port 1(bridge_slave_0) entered disabled state [ 33.685312] batman_adv: batadv0: Interface deactivated: batadv_slave_0 [ 33.693576] batman_adv: batadv0: Interface deactivated: batadv_slave_1 [ 33.727497] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 33.734174] IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready [ 33.743553] 8021q: adding VLAN 0 to HW filter on device bond0 [ 33.750636] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 33.756681] 8021q: adding VLAN 0 to HW filter on device team0 [ 33.764799] A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. [ 33.781800] skbuff: skb_over_panic: text:ffffffff858ce39f len:40 put:40 head:ffff8880a4b44a00 data:ffff8880a4b44ab0 tail:0xd8 end:0xc0 dev:ip6gre0 [ 33.795493] ------------[ cut here ]------------ [ 33.800243] kernel BUG at net/core/skbuff.c:104! [ 33.805061] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 33.810412] Modules linked in: [ 33.813583] CPU: 0 PID: 6550 Comm: kworker/0:3 Not tainted 4.14.198-syzkaller #0 [ 33.821101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.830453] Workqueue: ipv6_addrconf addrconf_dad_work [ 33.835717] task: ffff888099f18680 task.stack: ffff888089df0000 [ 33.841761] RIP: 0010:skb_panic+0x172/0x174 [ 33.846056] RSP: 0018:ffff888089df78d0 EFLAGS: 00010282 [ 33.851391] RAX: 0000000000000086 RBX: ffff88809172f840 RCX: 0000000000000000 [ 33.858747] RDX: 0000000000000000 RSI: ffffffff86ac12c0 RDI: ffffed10113bef10 [ 33.865993] RBP: ffffffff8738d1e0 R08: 0000000000000086 R09: 0000000000000000 [ 33.873240] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff858ce39f [ 33.880486] R13: 0000000000000028 R14: ffff888097f7c340 R15: 00000000000000c0 [ 33.887733] FS: 0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 [ 33.895951] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.901804] CR2: 00000000200005c0 CR3: 0000000007c6a000 CR4: 00000000001406f0 [ 33.909048] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.916303] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.923557] Call Trace: [ 33.926143] ? ip6_mc_hdr.constprop.0+0x11f/0x580 [ 33.931015] skb_put.cold+0x24/0x24 [ 33.934630] ip6_mc_hdr.constprop.0+0x11f/0x580 [ 33.939274] mld_newpack+0x3aa/0x720 [ 33.942972] ? ip6_mc_hdr.constprop.0+0x580/0x580 [ 33.947791] ? trace_hardirqs_on+0x10/0x10 [ 33.952010] add_grhead+0x265/0x330 [ 33.955611] add_grec+0xc40/0xed0 [ 33.959043] ? ip6_route_info_create+0x28b0/0x28b0 [ 33.963947] ? add_grhead+0x330/0x330 [ 33.967726] mld_send_initial_cr.part.0+0xb0/0x140 [ 33.972642] ipv6_mc_dad_complete+0x183/0x5a0 [ 33.977115] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 33.982115] addrconf_dad_completed+0x80f/0xa40 [ 33.986757] ? addrconf_rs_timer+0x550/0x550 [ 33.991145] ? __local_bh_enable_ip+0xc1/0x170 [ 33.995705] addrconf_dad_work+0x673/0xef0 [ 33.999926] ? lock_acquire+0x170/0x3f0 [ 34.003876] ? addrconf_dad_completed+0xa40/0xa40 [ 34.008696] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 34.014137] process_one_work+0x793/0x14a0 [ 34.018347] ? work_busy+0x320/0x320 [ 34.022046] ? worker_thread+0x158/0xff0 [ 34.026093] ? _raw_spin_unlock_irq+0x24/0x80 [ 34.030563] worker_thread+0x5cc/0xff0 [ 34.034426] ? rescuer_thread+0xc80/0xc80 [ 34.038557] kthread+0x30d/0x420 [ 34.041915] ? kthread_create_on_node+0xd0/0xd0 [ 34.046559] ret_from_fork+0x24/0x30 [ 34.050244] 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 80 ca 38 87 ff 74 24 10 ff 74 24 20 e8 95 68 39 fc <0f> 0b e8 2d c9 4a fc 4c 8b 64 24 18 e8 a3 85 74 fc 48 c7 c1 a0 [ 34.069330] RIP: skb_panic+0x172/0x174 RSP: ffff888089df78d0 [ 34.075216] ---[ end trace cd67aacbe5e8ab29 ]--- [ 34.080015] Kernel panic - not syncing: Fatal exception in interrupt [ 34.087630] Kernel Offset: disabled [ 34.091273] Rebooting in 86400 seconds..