[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 103.080453][ T33] audit: type=1800 audit(1583458667.129:25): pid=10906 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 103.112237][ T33] audit: type=1800 audit(1583458667.159:26): pid=10906 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 103.152664][ T33] audit: type=1800 audit(1583458667.189:27): pid=10906 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. syzkaller login: [ 116.235954][T11058] IPVS: ftp: loaded support on port[0] = 21 [ 116.322604][T11058] chnl_net:caif_netlink_parms(): no params data found [ 116.397102][T11058] bridge0: port 1(bridge_slave_0) entered blocking state [ 116.404309][T11058] bridge0: port 1(bridge_slave_0) entered disabled state [ 116.413172][T11058] device bridge_slave_0 entered promiscuous mode [ 116.422073][T11058] bridge0: port 2(bridge_slave_1) entered blocking state [ 116.429203][T11058] bridge0: port 2(bridge_slave_1) entered disabled state [ 116.437991][T11058] device bridge_slave_1 entered promiscuous mode [ 116.463987][T11058] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 116.475728][T11058] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 116.502056][T11058] team0: Port device team_slave_0 added [ 116.510443][T11058] team0: Port device team_slave_1 added [ 116.532702][T11058] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 116.539776][T11058] 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. [ 116.565878][T11058] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 116.577843][T11058] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 116.585040][T11058] 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. [ 116.611052][T11058] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 116.685571][T11058] device hsr_slave_0 entered promiscuous mode [ 116.732620][T11058] device hsr_slave_1 entered promiscuous mode [ 116.880225][T11058] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 116.936582][T11058] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 117.026332][T11058] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 117.086547][T11058] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 117.169490][T11058] bridge0: port 2(bridge_slave_1) entered blocking state [ 117.176744][T11058] bridge0: port 2(bridge_slave_1) entered forwarding state [ 117.184612][T11058] bridge0: port 1(bridge_slave_0) entered blocking state [ 117.191752][T11058] bridge0: port 1(bridge_slave_0) entered forwarding state [ 117.251015][T11058] 8021q: adding VLAN 0 to HW filter on device bond0 [ 117.268291][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 117.278516][ T12] bridge0: port 1(bridge_slave_0) entered disabled state [ 117.288301][ T12] bridge0: port 2(bridge_slave_1) entered disabled state [ 117.297707][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 117.316507][T11058] 8021q: adding VLAN 0 to HW filter on device team0 [ 117.328017][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 117.337946][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 117.346720][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 117.353959][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 117.369232][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 117.379011][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 117.388254][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 117.395491][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 117.410249][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready [ 117.425121][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready [ 117.443856][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready [ 117.453525][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 117.463426][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready [ 117.473423][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 117.484192][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 117.498737][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 117.508243][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 117.525463][T11058] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 117.538398][T11058] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 117.547502][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 117.556758][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 117.580658][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 117.588645][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 117.604699][T11058] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 117.628921][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 117.638691][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 117.665943][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 117.675379][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 117.689384][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 117.698410][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 117.708439][T11058] device veth0_vlan entered promiscuous mode [ 117.724649][T11058] device veth1_vlan entered promiscuous mode [ 117.752269][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 117.760858][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 117.770237][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 117.779529][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 117.793736][T11058] device veth0_macvtap entered promiscuous mode [ 117.805810][T11058] device veth1_macvtap entered promiscuous mode [ 117.829032][T11058] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 117.836691][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 117.846432][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 117.855342][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 117.864487][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 117.883340][T11058] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 117.891840][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 117.901287][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 118.142434][ C1] ===================================================== [ 118.149447][ C1] BUG: KMSAN: use-after-free in find_match+0x317/0x1480 [ 118.156367][ C1] CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.6.0-rc2-syzkaller #0 [ 118.164500][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 118.174547][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 118.180507][ C1] Call Trace: [ 118.183769][ C1] [ 118.186604][ C1] dump_stack+0x1c9/0x220 [ 118.190926][ C1] kmsan_report+0xf7/0x1e0 [ 118.195325][ C1] __msan_warning+0x58/0xa0 [ 118.199810][ C1] find_match+0x317/0x1480 [ 118.204214][ C1] ? pfifo_fast_enqueue+0x960/0x960 [ 118.209420][ C1] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 118.215469][ C1] ? __qdisc_run+0x3346/0x3350 [ 118.220215][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.225406][ C1] __find_rr_leaf+0x3f9/0x1160 [ 118.230163][ C1] ? kmsan_get_metadata+0x4f/0x180 [ 118.235252][ C1] fib6_table_lookup+0x586/0x1420 [ 118.240274][ C1] ip6_pol_route+0x203/0x2960 [ 118.244969][ C1] ip6_pol_route_input+0x123/0x140 [ 118.250066][ C1] fib6_rule_lookup+0x38f/0xa10 [ 118.254895][ C1] ? ip6_route_input_lookup+0x1f0/0x1f0 [ 118.260425][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.265638][ C1] ip6_route_input+0xb9d/0xcf0 [ 118.270387][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.275602][ C1] ip6_rcv_finish_core+0x1f9/0x470 [ 118.280726][ C1] ipv6_rcv+0x628/0x710 [ 118.284866][ C1] ? local_bh_enable+0x40/0x40 [ 118.289621][ C1] process_backlog+0xa41/0x1410 [ 118.294468][ C1] ? kmsan_get_metadata+0x4f/0x180 [ 118.299590][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.304793][ C1] ? rps_trigger_softirq+0x2e0/0x2e0 [ 118.310055][ C1] net_rx_action+0x786/0x1aa0 [ 118.314722][ C1] ? net_tx_action+0xc30/0xc30 [ 118.319463][ C1] __do_softirq+0x311/0x83d [ 118.323964][ C1] do_softirq_own_stack+0x49/0x80 [ 118.328959][ C1] [ 118.331878][ C1] __local_bh_enable_ip+0x184/0x1d0 [ 118.337071][ C1] local_bh_enable+0x36/0x40 [ 118.341640][ C1] ip6_finish_output2+0x2113/0x2640 [ 118.346842][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.352023][ C1] __ip6_finish_output+0x824/0x8e0 [ 118.357126][ C1] ip6_finish_output+0x166/0x410 [ 118.362053][ C1] ip6_output+0x60a/0x770 [ 118.366378][ C1] ? ip6_output+0x770/0x770 [ 118.370858][ C1] ? ac6_seq_show+0x200/0x200 [ 118.375511][ C1] ndisc_send_skb+0x1047/0x15a0 [ 118.380356][ C1] ? ndisc_error_report+0x1a0/0x1a0 [ 118.385533][ C1] ndisc_send_ns+0xe38/0xe80 [ 118.390102][ C1] ? __queue_delayed_work+0x27f/0x450 [ 118.395453][ C1] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 118.401262][ C1] addrconf_dad_work+0xc0b/0x2aa0 [ 118.406266][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.411462][ C1] ? ipv6_get_saddr_eval+0x1350/0x1350 [ 118.416903][ C1] process_one_work+0x1555/0x1f40 [ 118.421956][ C1] worker_thread+0xef6/0x2450 [ 118.426681][ C1] kthread+0x4b5/0x4f0 [ 118.430826][ C1] ? process_one_work+0x1f40/0x1f40 [ 118.436024][ C1] ? kthread_blkcg+0xf0/0xf0 [ 118.440608][ C1] ret_from_fork+0x35/0x40 [ 118.445008][ C1] [ 118.447326][ C1] Uninit was created at: [ 118.451587][ C1] kmsan_internal_poison_shadow+0x66/0xd0 [ 118.457284][ C1] kmsan_slab_free+0x6e/0xb0 [ 118.461849][ C1] kfree+0x565/0x30a0 [ 118.465814][ C1] netdev_name_node_alt_destroy+0x587/0x690 [ 118.471814][ C1] rtnl_linkprop+0x939/0xc00 [ 118.476383][ C1] rtnl_dellinkprop+0x9d/0xb0 [ 118.481065][ C1] rtnetlink_rcv_msg+0x1153/0x1570 [ 118.486151][ C1] netlink_rcv_skb+0x451/0x650 [ 118.490890][ C1] rtnetlink_rcv+0x50/0x60 [ 118.495284][ C1] netlink_unicast+0xf9e/0x1100 [ 118.500108][ C1] netlink_sendmsg+0x1246/0x14d0 [ 118.505024][ C1] ____sys_sendmsg+0x12b6/0x1350 [ 118.509969][ C1] __sys_sendmsg+0x451/0x5f0 [ 118.514531][ C1] __se_sys_sendmsg+0x97/0xb0 [ 118.519181][ C1] __x64_sys_sendmsg+0x4a/0x70 [ 118.523964][ C1] do_syscall_64+0xb8/0x160 [ 118.528448][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 118.534343][ C1] ===================================================== [ 118.541249][ C1] Disabling lock debugging due to kernel taint [ 118.547418][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 118.553985][ C1] CPU: 1 PID: 17 Comm: kworker/1:0 Tainted: G B 5.6.0-rc2-syzkaller #0 [ 118.563515][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 118.573560][ C1] Workqueue: ipv6_addrconf addrconf_dad_work [ 118.579516][ C1] Call Trace: [ 118.582780][ C1] [ 118.585617][ C1] dump_stack+0x1c9/0x220 [ 118.589941][ C1] panic+0x3d5/0xc3e [ 118.593852][ C1] kmsan_report+0x1df/0x1e0 [ 118.598351][ C1] __msan_warning+0x58/0xa0 [ 118.602845][ C1] find_match+0x317/0x1480 [ 118.607265][ C1] ? pfifo_fast_enqueue+0x960/0x960 [ 118.612452][ C1] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 118.618509][ C1] ? __qdisc_run+0x3346/0x3350 [ 118.623259][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.628450][ C1] __find_rr_leaf+0x3f9/0x1160 [ 118.633357][ C1] ? kmsan_get_metadata+0x4f/0x180 [ 118.638503][ C1] fib6_table_lookup+0x586/0x1420 [ 118.643545][ C1] ip6_pol_route+0x203/0x2960 [ 118.648223][ C1] ip6_pol_route_input+0x123/0x140 [ 118.653375][ C1] fib6_rule_lookup+0x38f/0xa10 [ 118.658252][ C1] ? ip6_route_input_lookup+0x1f0/0x1f0 [ 118.663790][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.669015][ C1] ip6_route_input+0xb9d/0xcf0 [ 118.673769][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.678956][ C1] ip6_rcv_finish_core+0x1f9/0x470 [ 118.684051][ C1] ipv6_rcv+0x628/0x710 [ 118.688193][ C1] ? local_bh_enable+0x40/0x40 [ 118.692940][ C1] process_backlog+0xa41/0x1410 [ 118.697776][ C1] ? kmsan_get_metadata+0x4f/0x180 [ 118.702871][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.708052][ C1] ? rps_trigger_softirq+0x2e0/0x2e0 [ 118.713371][ C1] net_rx_action+0x786/0x1aa0 [ 118.718050][ C1] ? net_tx_action+0xc30/0xc30 [ 118.722810][ C1] __do_softirq+0x311/0x83d [ 118.727318][ C1] do_softirq_own_stack+0x49/0x80 [ 118.732344][ C1] [ 118.735279][ C1] __local_bh_enable_ip+0x184/0x1d0 [ 118.740472][ C1] local_bh_enable+0x36/0x40 [ 118.745051][ C1] ip6_finish_output2+0x2113/0x2640 [ 118.750265][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.755487][ C1] __ip6_finish_output+0x824/0x8e0 [ 118.760609][ C1] ip6_finish_output+0x166/0x410 [ 118.765595][ C1] ip6_output+0x60a/0x770 [ 118.769978][ C1] ? ip6_output+0x770/0x770 [ 118.774467][ C1] ? ac6_seq_show+0x200/0x200 [ 118.779207][ C1] ndisc_send_skb+0x1047/0x15a0 [ 118.784109][ C1] ? ndisc_error_report+0x1a0/0x1a0 [ 118.789329][ C1] ndisc_send_ns+0xe38/0xe80 [ 118.793907][ C1] ? __queue_delayed_work+0x27f/0x450 [ 118.799389][ C1] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 118.805212][ C1] addrconf_dad_work+0xc0b/0x2aa0 [ 118.810223][ C1] ? kmsan_get_metadata+0x11d/0x180 [ 118.815427][ C1] ? ipv6_get_saddr_eval+0x1350/0x1350 [ 118.820868][ C1] process_one_work+0x1555/0x1f40 [ 118.826802][ C1] worker_thread+0xef6/0x2450 [ 118.831503][ C1] kthread+0x4b5/0x4f0 [ 118.836674][ C1] ? process_one_work+0x1f40/0x1f40 [ 118.841879][ C1] ? kthread_blkcg+0xf0/0xf0 [ 118.846458][ C1] ret_from_fork+0x35/0x40 [ 118.852148][ C1] Kernel Offset: 0x19e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 118.863775][ C1] Rebooting in 86400 seconds..