[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.173' (ECDSA) to the list of known hosts. syzkaller login: [ 56.398084] audit: type=1400 audit(1597664350.307:8): avc: denied { execmem } for pid=6359 comm="syz-executor767" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 56.420705] IPVS: ftp: loaded support on port[0] = 21 [ 56.493388] chnl_net:caif_netlink_parms(): no params data found [ 56.591623] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.598410] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.605362] device bridge_slave_0 entered promiscuous mode [ 56.612598] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.619515] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.626785] device bridge_slave_1 entered promiscuous mode [ 56.642114] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.650882] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.668599] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 56.675673] team0: Port device team_slave_0 added [ 56.681371] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 56.689092] team0: Port device team_slave_1 added [ 56.703594] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 56.709957] 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. [ 56.735210] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 56.746968] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 56.753201] 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. [ 56.778409] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 56.788936] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.796434] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.813830] device hsr_slave_0 entered promiscuous mode [ 56.819798] device hsr_slave_1 entered promiscuous mode [ 56.825620] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 56.832752] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 56.891519] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.898047] bridge0: port 2(bridge_slave_1) entered forwarding state [ 56.904929] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.911349] bridge0: port 1(bridge_slave_0) entered forwarding state [ 56.939429] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 56.945645] 8021q: adding VLAN 0 to HW filter on device bond0 [ 56.954765] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 56.963417] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 56.981848] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.989504] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.999855] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 57.006278] 8021q: adding VLAN 0 to HW filter on device team0 [ 57.014311] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 57.022115] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.028508] bridge0: port 1(bridge_slave_0) entered forwarding state [ 57.046439] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 57.054015] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.060426] bridge0: port 2(bridge_slave_1) entered forwarding state [ 57.068391] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 57.076083] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 57.083536] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 57.091877] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 57.100813] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 57.110744] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 57.117806] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 57.130129] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 57.137853] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 57.144612] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 57.155338] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 57.203189] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 57.212652] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 57.243118] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 57.250891] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 57.257401] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 57.267400] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 57.274898] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 57.282249] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 57.291463] device veth0_vlan entered promiscuous mode [ 57.300838] device veth1_vlan entered promiscuous mode [ 57.307057] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 57.315260] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 57.326415] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 57.335189] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 57.343101] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 57.350787] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 57.361047] device veth0_macvtap entered promiscuous mode [ 57.367119] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 57.374870] device veth1_macvtap entered promiscuous mode [ 57.383639] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 57.392775] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 57.402320] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 57.409348] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 57.417646] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 57.428043] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 57.437463] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 57.486020] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 57.542165] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.548913] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.573492] batman_adv: batadv0: Interface deactivated: batadv_slave_0 [ 57.581358] batman_adv: batadv0: Interface deactivated: batadv_slave_1 [ 57.613317] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 57.619994] IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready [ 57.628956] IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready [ 57.636796] 8021q: adding VLAN 0 to HW filter on device bond0 [ 57.643554] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 57.649734] 8021q: adding VLAN 0 to HW filter on device team0 [ 57.657686] A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. [ 57.696055] skbuff: skb_over_panic: text:ffffffff858bb9df len:40 put:40 head:ffff888088e62000 data:ffff888088e620b0 tail:0xd8 end:0xc0 dev:ip6gre0 [ 57.709573] ------------[ cut here ]------------ [ 57.714306] kernel BUG at net/core/skbuff.c:104! [ 57.719100] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 57.724447] Modules linked in: [ 57.727620] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.193-syzkaller #0 [ 57.734711] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.744040] task: ffff8880a98c4340 task.stack: ffff8880a98d0000 [ 57.750078] RIP: 0010:skb_panic+0x172/0x174 [ 57.754422] RSP: 0018:ffff8880aeb079c0 EFLAGS: 00010286 [ 57.759809] RAX: 0000000000000086 RBX: ffff8880a9156780 RCX: 0000000000000000 [ 57.767081] RDX: 0000000000000100 RSI: ffffffff86ac0dc0 RDI: ffffed1015d60f2e [ 57.774325] RBP: ffffffff8738b0e0 R08: 0000000000000086 R09: 0000000000000000 [ 57.781570] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff858bb9df [ 57.788843] R13: 0000000000000028 R14: ffff8880986487c0 R15: 00000000000000c0 [ 57.796090] FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 [ 57.804291] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.810146] CR2: 0000000020000140 CR3: 00000000a40ad000 CR4: 00000000001406e0 [ 57.817392] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.824826] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.832082] Call Trace: [ 57.834638] [ 57.836779] ? ip6_mc_hdr.constprop.0+0x11f/0x580 [ 57.841601] skb_put.cold+0x24/0x24 [ 57.845201] ip6_mc_hdr.constprop.0+0x11f/0x580 [ 57.849843] mld_newpack+0x3aa/0x720 [ 57.853547] ? ip6_mc_hdr.constprop.0+0x580/0x580 [ 57.858364] ? trace_hardirqs_on+0x10/0x10 [ 57.862677] add_grhead+0x265/0x330 [ 57.866277] add_grec+0xc40/0xed0 [ 57.869704] ? mld_ifc_timer_expire+0xa6c/0xcd0 [ 57.874346] ? add_grhead+0x330/0x330 [ 57.878121] mld_ifc_timer_expire+0x508/0xcd0 [ 57.882609] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 57.888046] call_timer_fn+0x14a/0x650 [ 57.891924] ? igmp6_group_added+0x4c0/0x4c0 [ 57.896323] ? collect_expired_timers+0x250/0x250 [ 57.901164] ? _raw_spin_unlock_irq+0x24/0x80 [ 57.905630] ? igmp6_group_added+0x4c0/0x4c0 [ 57.910028] expire_timers+0x232/0x4d0 [ 57.913890] run_timer_softirq+0x1d5/0x5a0 [ 57.918098] ? expire_timers+0x4d0/0x4d0 [ 57.922151] ? kvm_clock_read+0x1f/0x30 [ 57.926115] ? kvm_sched_clock_read+0x5/0x10 [ 57.930497] ? sched_clock+0x2a/0x40 [ 57.934183] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 57.939605] __do_softirq+0x254/0xa1d [ 57.943398] ? check_preemption_disabled+0x35/0x240 [ 57.948412] irq_exit+0x193/0x240 [ 57.951853] smp_apic_timer_interrupt+0x141/0x5e0 [ 57.956669] apic_timer_interrupt+0x93/0xa0 [ 57.960977] [ 57.963187] RIP: 0010:native_safe_halt+0xe/0x10 [ 57.967825] RSP: 0018:ffff8880a98d7ea8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 [ 57.975518] RAX: 1ffffffff0fa2d24 RBX: dffffc0000000000 RCX: 0000000000000000 [ 57.982760] RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880a98c4bc4 [ 57.990002] RBP: ffffffff87d16910 R08: 0000000000000000 R09: 0000000000000000 [ 57.997266] R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1015318868 [ 58.004510] R13: ffff8880a98c4340 R14: 0000000000000000 R15: 0000000000000000 [ 58.011765] default_idle+0x47/0x370 [ 58.015454] do_idle+0x250/0x3c0 [ 58.018794] cpu_startup_entry+0x14/0x20 [ 58.022827] start_secondary+0x488/0x5f0 [ 58.026860] secondary_startup_64+0xa5/0xb0 [ 58.031170] 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 a9 38 87 ff 74 24 10 ff 74 24 20 e8 85 91 3a fc <0f> 0b e8 1d f1 4b fc 4c 8b 64 24 18 e8 43 a5 75 fc 48 c7 c1 a0 [ 58.050249] RIP: skb_panic+0x172/0x174 RSP: ffff8880aeb079c0 [ 58.056065] ---[ end trace afe717ae4eb7cb89 ]--- [ 58.060808] Kernel panic - not syncing: Fatal exception in interrupt [ 58.070394] Kernel Offset: disabled [ 58.074004] Rebooting in 86400 seconds..