[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 94.517136][ T27] kauditd_printk_skb: 4 callbacks suppressed [ 94.517147][ T27] audit: type=1800 audit(1582162533.749:29): pid=10216 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 94.544417][ T27] audit: type=1800 audit(1582162533.749:30): pid=10216 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.108' (ECDSA) to the list of known hosts. syzkaller login: [ 104.428439][T10369] IPVS: ftp: loaded support on port[0] = 21 [ 104.481357][T10369] chnl_net:caif_netlink_parms(): no params data found [ 104.520664][T10369] bridge0: port 1(bridge_slave_0) entered blocking state [ 104.528173][T10369] bridge0: port 1(bridge_slave_0) entered disabled state [ 104.536340][T10369] device bridge_slave_0 entered promiscuous mode [ 104.544833][T10369] bridge0: port 2(bridge_slave_1) entered blocking state [ 104.552015][T10369] bridge0: port 2(bridge_slave_1) entered disabled state [ 104.559764][T10369] device bridge_slave_1 entered promiscuous mode [ 104.577612][T10369] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 104.588683][T10369] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 104.608558][T10369] team0: Port device team_slave_0 added [ 104.616184][T10369] team0: Port device team_slave_1 added [ 104.631262][T10369] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 104.638233][T10369] 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. [ 104.664258][T10369] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 104.676766][T10369] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 104.683849][T10369] 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. [ 104.709870][T10369] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 104.772461][T10369] device hsr_slave_0 entered promiscuous mode [ 104.840564][T10369] device hsr_slave_1 entered promiscuous mode [ 104.946693][T10369] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 105.004104][T10369] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 105.063069][T10369] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 105.102814][T10369] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 105.156433][T10369] bridge0: port 2(bridge_slave_1) entered blocking state [ 105.163813][T10369] bridge0: port 2(bridge_slave_1) entered forwarding state [ 105.171849][T10369] bridge0: port 1(bridge_slave_0) entered blocking state [ 105.178946][T10369] bridge0: port 1(bridge_slave_0) entered forwarding state [ 105.224632][T10369] 8021q: adding VLAN 0 to HW filter on device bond0 [ 105.238276][ T2889] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 105.248897][ T2889] bridge0: port 1(bridge_slave_0) entered disabled state [ 105.257509][ T2889] bridge0: port 2(bridge_slave_1) entered disabled state [ 105.266358][ T2889] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 105.279412][T10369] 8021q: adding VLAN 0 to HW filter on device team0 [ 105.291399][ T2756] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 105.301979][ T2756] bridge0: port 1(bridge_slave_0) entered blocking state [ 105.309069][ T2756] bridge0: port 1(bridge_slave_0) entered forwarding state [ 105.330709][ T2889] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 105.339204][ T2889] bridge0: port 2(bridge_slave_1) entered blocking state [ 105.346366][ T2889] bridge0: port 2(bridge_slave_1) entered forwarding state [ 105.356165][ T2889] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 105.375355][T10369] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 105.386646][T10369] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 105.400063][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 105.408707][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 105.417517][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 105.428133][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 105.438898][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 105.456839][ T2756] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 105.464615][ T2756] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 105.478443][T10369] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 105.498676][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 105.507366][ T2890] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 105.527377][ T2756] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 105.535658][ T2756] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 105.544823][ T2756] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 105.552972][ T2756] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 105.563114][T10369] device veth0_vlan entered promiscuous mode [ 105.576313][T10369] device veth1_vlan entered promiscuous mode [ 105.601398][ T2886] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 105.609535][ T2886] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 105.618175][ T2886] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 105.627106][ T2886] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 105.638617][T10369] device veth0_macvtap entered promiscuous mode [ 105.649344][T10369] device veth1_macvtap entered promiscuous mode [ 105.666703][T10369] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 105.674855][ T2751] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 105.683463][ T2751] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 105.692114][ T2751] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 105.701256][ T2751] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 105.715888][T10369] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 105.723713][ T2886] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 105.734127][ T2886] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 105.950644][ C0] ================================================================== [ 105.959025][ C0] BUG: KASAN: use-after-free in find_match+0xb39/0xc90 [ 105.965873][ C0] Read of size 8 at addr ffff888098cf8320 by task kworker/0:37/2886 [ 105.973881][ C0] [ 105.976196][ C0] CPU: 0 PID: 2886 Comm: kworker/0:37 Not tainted 5.6.0-rc2-syzkaller #0 [ 105.984600][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 105.994676][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 106.000673][ C0] Call Trace: [ 106.003943][ C0] [ 106.006808][ C0] dump_stack+0x197/0x210 [ 106.011134][ C0] ? find_match+0xb39/0xc90 [ 106.015630][ C0] print_address_description.constprop.0.cold+0xd4/0x30b [ 106.022644][ C0] ? find_match+0xb39/0xc90 [ 106.027203][ C0] ? find_match+0xb39/0xc90 [ 106.031697][ C0] __kasan_report.cold+0x1b/0x32 [ 106.036662][ C0] ? find_match+0xb39/0xc90 [ 106.041190][ C0] kasan_report+0x12/0x20 [ 106.045531][ C0] __asan_report_load8_noabort+0x14/0x20 [ 106.051157][ C0] find_match+0xb39/0xc90 [ 106.055478][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.060490][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 106.066737][ C0] __find_rr_leaf+0x14e/0x750 [ 106.071405][ C0] ? nexthop_is_blackhole+0x690/0x690 [ 106.076791][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 106.082934][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.087936][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 106.093727][ C0] fib6_table_lookup+0x697/0xdb0 [ 106.098661][ C0] ? rt6_age_exceptions+0x130/0x130 [ 106.103876][ C0] ? __kasan_check_read+0x11/0x20 [ 106.108902][ C0] ip6_pol_route+0x1f6/0xa70 [ 106.113488][ C0] ? ip6_pol_route_lookup+0x12e0/0x12e0 [ 106.119033][ C0] ? flow_hash_from_keys+0x2c4/0x8c0 [ 106.124308][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.129319][ C0] ip6_pol_route_input+0x65/0x80 [ 106.134261][ C0] fib6_rule_lookup+0x133/0x7d0 [ 106.139097][ C0] ? ip6_pol_route+0xa70/0xa70 [ 106.143919][ C0] ? fib6_lookup+0x340/0x340 [ 106.148502][ C0] ? br_nf_post_routing+0xd5f/0x1d10 [ 106.153877][ C0] ? br_forward_finish+0x235/0x3f0 [ 106.159107][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 106.165249][ C0] ip6_route_input_lookup+0xb7/0xd0 [ 106.170513][ C0] ip6_route_input+0x5f0/0xa40 [ 106.175450][ C0] ? __kasan_check_read+0x11/0x20 [ 106.180493][ C0] ? ip6_route_check_nh+0x670/0x670 [ 106.185714][ C0] ? __kasan_check_read+0x11/0x20 [ 106.190766][ C0] ? mark_lock+0xc2/0x1220 [ 106.195184][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.200192][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 106.205998][ C0] ip6_rcv_finish_core.isra.0+0x174/0x590 [ 106.211709][ C0] ip6_rcv_finish+0x17a/0x310 [ 106.216371][ C0] ? ip6_rcv_finish_core.isra.0+0x590/0x590 [ 106.222279][ C0] ip_sabotage_in+0x20d/0x280 [ 106.226945][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.231971][ C0] nf_hook_slow+0xbc/0x1e0 [ 106.236371][ C0] ? rcu_dynticks_curr_cpu_in_eqs+0x54/0xb0 [ 106.242248][ C0] ipv6_rcv+0x25d/0x420 [ 106.246385][ C0] ? ip6_rcv_core.isra.0+0x1c30/0x1c30 [ 106.251829][ C0] ? ip6_rcv_finish_core.isra.0+0x590/0x590 [ 106.257712][ C0] ? ip6_rcv_core.isra.0+0x1c30/0x1c30 [ 106.263170][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 106.269067][ C0] ? __netif_receive_skb_core+0x30b0/0x30b0 [ 106.275021][ C0] ? lock_acquire+0x190/0x410 [ 106.279707][ C0] ? netif_receive_skb+0xf9/0x990 [ 106.284923][ C0] __netif_receive_skb+0x2c/0x1d0 [ 106.289969][ C0] netif_receive_skb+0x17b/0x990 [ 106.294964][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 106.301183][ C0] ? __netif_receive_skb+0x1d0/0x1d0 [ 106.306476][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.311502][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 106.317303][ C0] ? __kasan_check_read+0x11/0x20 [ 106.322385][ C0] br_pass_frame_up+0x43f/0x910 [ 106.327233][ C0] ? br_add_if.cold+0x33/0x33 [ 106.331895][ C0] ? deliver_clone+0x69/0xc0 [ 106.336475][ C0] ? br_pass_frame_up+0x910/0x910 [ 106.341496][ C0] br_handle_frame_finish+0x6e0/0x16c0 [ 106.346942][ C0] ? br_handle_local_finish+0x20/0x20 [ 106.352774][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 106.358935][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.363966][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 106.369798][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 106.374399][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 106.379560][ C0] ? br_handle_local_finish+0x20/0x20 [ 106.384940][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 106.390097][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 106.396305][ C0] ? br_handle_local_finish+0x20/0x20 [ 106.401718][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.406741][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 106.412556][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 106.418448][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 106.424335][ C0] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 106.430299][ C0] ? br_handle_local_finish+0x20/0x20 [ 106.435674][ C0] ? __kasan_check_read+0x11/0x20 [ 106.440707][ C0] br_nf_pre_routing_ipv6+0x456/0x830 [ 106.446192][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 106.451227][ C0] ? br_nf_pre_routing.cold+0x2d/0x2d [ 106.456592][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 106.461617][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 106.467851][ C0] ? skb_pull_rcsum+0x155/0x300 [ 106.472712][ C0] br_nf_pre_routing+0x1896/0x22b3 [ 106.477813][ C0] ? br_nf_pre_routing_finish+0x1790/0x1790 [ 106.483775][ C0] ? br_nf_pre_routing_finish+0x1790/0x1790 [ 106.489960][ C0] br_handle_frame+0x806/0x1340 [ 106.495005][ C0] ? br_handle_frame_finish+0x16c0/0x16c0 [ 106.500846][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 106.507010][ C0] ? br_handle_local_finish+0x20/0x20 [ 106.512420][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 106.518263][ C0] ? br_handle_frame_finish+0x16c0/0x16c0 [ 106.523971][ C0] __netif_receive_skb_core+0xfbc/0x30b0 [ 106.529586][ C0] ? lock_downgrade+0x920/0x920 [ 106.534449][ C0] ? __check_heap_object+0x50/0xb3 [ 106.539579][ C0] ? do_xdp_generic+0x50/0x50 [ 106.544320][ C0] ? __kasan_check_read+0x11/0x20 [ 106.549481][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 106.554407][ C0] ? swake_up_one+0x4d/0x60 [ 106.559102][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 106.564918][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 106.570891][ C0] ? __netif_receive_skb_core+0x30b0/0x30b0 [ 106.576798][ C0] ? lock_acquire+0x190/0x410 [ 106.581458][ C0] ? process_backlog+0x1b5/0x780 [ 106.586383][ C0] __netif_receive_skb+0x2c/0x1d0 [ 106.591391][ C0] process_backlog+0x226/0x780 [ 106.596135][ C0] ? net_rx_action+0x27b/0x1120 [ 106.600966][ C0] ? lockdep_hardirqs_on+0x19e/0x5e0 [ 106.606234][ C0] net_rx_action+0x508/0x1120 [ 106.610905][ C0] ? napi_busy_loop+0x970/0x970 [ 106.615755][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 106.621280][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 106.627240][ C0] ? ip6_finish_output2+0x10d3/0x25c0 [ 106.632590][ C0] ? trace_hardirqs_on+0x67/0x240 [ 106.637600][ C0] __do_softirq+0x262/0x98c [ 106.642091][ C0] ? ip6_finish_output2+0x10d3/0x25c0 [ 106.647443][ C0] do_softirq_own_stack+0x2a/0x40 [ 106.652443][ C0] [ 106.655368][ C0] do_softirq.part.0+0x11a/0x170 [ 106.660302][ C0] __local_bh_enable_ip+0x211/0x270 [ 106.665495][ C0] ip6_finish_output2+0x1101/0x25c0 [ 106.670690][ C0] ? ip6_mtu+0x2e6/0x450 [ 106.674927][ C0] ? ip6_frag_next+0xb20/0xb20 [ 106.679674][ C0] ? lock_downgrade+0x920/0x920 [ 106.684513][ C0] ? __kasan_check_read+0x11/0x20 [ 106.689541][ C0] __ip6_finish_output+0x444/0xaa0 [ 106.694636][ C0] ? __ip6_finish_output+0x444/0xaa0 [ 106.699936][ C0] ip6_finish_output+0x38/0x1f0 [ 106.705011][ C0] ip6_output+0x25e/0x880 [ 106.709355][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 106.714479][ C0] ? __ip6_finish_output+0xaa0/0xaa0 [ 106.719809][ C0] ndisc_send_skb+0xf1f/0x1490 [ 106.724608][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 106.729893][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 106.736149][ C0] ? skb_set_owner_w+0x265/0x410 [ 106.741084][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 106.746795][ C0] ndisc_send_ns+0x3a9/0x850 [ 106.751386][ C0] ? mark_held_locks+0xa4/0xf0 [ 106.756147][ C0] ? ndisc_netdev_event+0x5e0/0x5e0 [ 106.761335][ C0] ? lockdep_hardirqs_on+0x421/0x5e0 [ 106.766632][ C0] ? addrconf_dad_work+0xb2c/0x11d0 [ 106.771876][ C0] ? trace_hardirqs_on+0x67/0x240 [ 106.776891][ C0] ? addrconf_dad_work+0xb2c/0x11d0 [ 106.782082][ C0] addrconf_dad_work+0xbf3/0x11d0 [ 106.788974][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 106.794986][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 106.802479][ C0] ? trace_hardirqs_on+0x67/0x240 [ 106.808247][ C0] process_one_work+0xa05/0x17a0 [ 106.814107][ C0] ? mark_held_locks+0xf0/0xf0 [ 106.820261][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 106.825672][ C0] ? lock_acquire+0x190/0x410 [ 106.830362][ C0] worker_thread+0x98/0xe40 [ 106.834903][ C0] kthread+0x361/0x430 [ 106.839137][ C0] ? process_one_work+0x17a0/0x17a0 [ 106.844422][ C0] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 106.850148][ C0] ret_from_fork+0x24/0x30 [ 106.854582][ C0] [ 106.856917][ C0] Allocated by task 10369: [ 106.861509][ C0] save_stack+0x23/0x90 [ 106.866625][ C0] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 106.872255][ C0] kasan_kmalloc+0x9/0x10 [ 106.876578][ C0] __kmalloc_node+0x4e/0x70 [ 106.881209][ C0] kvmalloc_node+0x68/0x100 [ 106.885945][ C0] alloc_netdev_mqs+0x98/0xe40 [ 106.890831][ C0] vti6_init_net+0x244/0x810 [ 106.895418][ C0] ops_init+0xb3/0x420 [ 106.899475][ C0] setup_net+0x2d5/0x8b0 [ 106.903720][ C0] copy_net_ns+0x29e/0x5a0 [ 106.908124][ C0] create_new_namespaces+0x403/0xb50 [ 106.913409][ C0] unshare_nsproxy_namespaces+0xc2/0x200 [ 106.919033][ C0] ksys_unshare+0x444/0x980 [ 106.923540][ C0] __x64_sys_unshare+0x31/0x40 [ 106.928385][ C0] do_syscall_64+0xfa/0x790 [ 106.932873][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 106.938789][ C0] [ 106.941154][ C0] Freed by task 10369: [ 106.945225][ C0] save_stack+0x23/0x90 [ 106.949386][ C0] __kasan_slab_free+0x102/0x150 [ 106.954455][ C0] kasan_slab_free+0xe/0x10 [ 106.958947][ C0] kfree+0x10a/0x2c0 [ 106.962988][ C0] __netdev_name_node_alt_destroy+0x1ff/0x2a0 [ 106.969074][ C0] netdev_name_node_alt_destroy+0x57/0x80 [ 106.974785][ C0] rtnl_linkprop.isra.0+0x575/0x6f0 [ 106.979984][ C0] rtnl_dellinkprop+0x46/0x60 [ 106.984644][ C0] rtnetlink_rcv_msg+0x45e/0xaf0 [ 106.989565][ C0] netlink_rcv_skb+0x177/0x450 [ 106.994316][ C0] rtnetlink_rcv+0x1d/0x30 [ 106.998709][ C0] netlink_unicast+0x59e/0x7e0 [ 107.003450][ C0] netlink_sendmsg+0x91c/0xea0 [ 107.008208][ C0] sock_sendmsg+0xd7/0x130 [ 107.012695][ C0] ____sys_sendmsg+0x753/0x880 [ 107.017464][ C0] ___sys_sendmsg+0x100/0x170 [ 107.022134][ C0] __sys_sendmsg+0x105/0x1d0 [ 107.026887][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 107.031662][ C0] do_syscall_64+0xfa/0x790 [ 107.036155][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 107.042024][ C0] [ 107.044337][ C0] The buggy address belongs to the object at ffff888098cf8000 [ 107.044337][ C0] which belongs to the cache kmalloc-4k of size 4096 [ 107.058455][ C0] The buggy address is located 800 bytes inside of [ 107.058455][ C0] 4096-byte region [ffff888098cf8000, ffff888098cf9000) [ 107.071803][ C0] The buggy address belongs to the page: [ 107.077431][ C0] page:ffffea0002633e00 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 [ 107.090413][ C0] flags: 0xfffe0000010200(slab|head) [ 107.095736][ C0] raw: 00fffe0000010200 ffffea000240f688 ffffea0002785b08 ffff8880aa402000 [ 107.104309][ C0] raw: 0000000000000000 ffff888098cf8000 0000000100000001 0000000000000000 [ 107.112868][ C0] page dumped because: kasan: bad access detected [ 107.119254][ C0] [ 107.121558][ C0] Memory state around the buggy address: [ 107.127346][ C0] ffff888098cf8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 107.135541][ C0] ffff888098cf8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 107.143607][ C0] >ffff888098cf8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 107.151649][ C0] ^ [ 107.156923][ C0] ffff888098cf8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 107.164983][ C0] ffff888098cf8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 107.173024][ C0] ================================================================== [ 107.181065][ C0] Disabling lock debugging due to kernel taint [ 107.187254][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 107.193847][ C0] CPU: 0 PID: 2886 Comm: kworker/0:37 Tainted: G B 5.6.0-rc2-syzkaller #0 [ 107.203638][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 107.214059][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 107.220044][ C0] Call Trace: [ 107.223307][ C0] [ 107.226154][ C0] dump_stack+0x197/0x210 [ 107.230486][ C0] panic+0x2e3/0x75c [ 107.234378][ C0] ? add_taint.cold+0x16/0x16 [ 107.239050][ C0] ? retint_kernel+0x2b/0x2b [ 107.243642][ C0] ? trace_hardirqs_on+0x5e/0x240 [ 107.248656][ C0] ? find_match+0xb39/0xc90 [ 107.253161][ C0] end_report+0x47/0x4f [ 107.257305][ C0] ? find_match+0xb39/0xc90 [ 107.261813][ C0] __kasan_report.cold+0xe/0x32 [ 107.266674][ C0] ? find_match+0xb39/0xc90 [ 107.271174][ C0] kasan_report+0x12/0x20 [ 107.275512][ C0] __asan_report_load8_noabort+0x14/0x20 [ 107.281130][ C0] find_match+0xb39/0xc90 [ 107.285468][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.290475][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 107.296264][ C0] __find_rr_leaf+0x14e/0x750 [ 107.300940][ C0] ? nexthop_is_blackhole+0x690/0x690 [ 107.306290][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 107.312426][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.317428][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 107.323213][ C0] fib6_table_lookup+0x697/0xdb0 [ 107.328133][ C0] ? rt6_age_exceptions+0x130/0x130 [ 107.333338][ C0] ? __kasan_check_read+0x11/0x20 [ 107.338337][ C0] ip6_pol_route+0x1f6/0xa70 [ 107.342921][ C0] ? ip6_pol_route_lookup+0x12e0/0x12e0 [ 107.348451][ C0] ? flow_hash_from_keys+0x2c4/0x8c0 [ 107.353732][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.358791][ C0] ip6_pol_route_input+0x65/0x80 [ 107.363734][ C0] fib6_rule_lookup+0x133/0x7d0 [ 107.368588][ C0] ? ip6_pol_route+0xa70/0xa70 [ 107.373341][ C0] ? fib6_lookup+0x340/0x340 [ 107.377935][ C0] ? br_nf_post_routing+0xd5f/0x1d10 [ 107.383226][ C0] ? br_forward_finish+0x235/0x3f0 [ 107.388412][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 107.394304][ C0] ip6_route_input_lookup+0xb7/0xd0 [ 107.399493][ C0] ip6_route_input+0x5f0/0xa40 [ 107.404247][ C0] ? __kasan_check_read+0x11/0x20 [ 107.409252][ C0] ? ip6_route_check_nh+0x670/0x670 [ 107.414429][ C0] ? __kasan_check_read+0x11/0x20 [ 107.419432][ C0] ? mark_lock+0xc2/0x1220 [ 107.423847][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.428860][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 107.434651][ C0] ip6_rcv_finish_core.isra.0+0x174/0x590 [ 107.440350][ C0] ip6_rcv_finish+0x17a/0x310 [ 107.445004][ C0] ? ip6_rcv_finish_core.isra.0+0x590/0x590 [ 107.450883][ C0] ip_sabotage_in+0x20d/0x280 [ 107.455655][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.460661][ C0] nf_hook_slow+0xbc/0x1e0 [ 107.465054][ C0] ? rcu_dynticks_curr_cpu_in_eqs+0x54/0xb0 [ 107.470945][ C0] ipv6_rcv+0x25d/0x420 [ 107.475080][ C0] ? ip6_rcv_core.isra.0+0x1c30/0x1c30 [ 107.480518][ C0] ? ip6_rcv_finish_core.isra.0+0x590/0x590 [ 107.486477][ C0] ? ip6_rcv_core.isra.0+0x1c30/0x1c30 [ 107.491929][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 107.497828][ C0] ? __netif_receive_skb_core+0x30b0/0x30b0 [ 107.503799][ C0] ? lock_acquire+0x190/0x410 [ 107.508593][ C0] ? netif_receive_skb+0xf9/0x990 [ 107.513610][ C0] __netif_receive_skb+0x2c/0x1d0 [ 107.518638][ C0] netif_receive_skb+0x17b/0x990 [ 107.523570][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 107.529792][ C0] ? __netif_receive_skb+0x1d0/0x1d0 [ 107.535070][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.540101][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 107.545960][ C0] ? __kasan_check_read+0x11/0x20 [ 107.551022][ C0] br_pass_frame_up+0x43f/0x910 [ 107.555857][ C0] ? br_add_if.cold+0x33/0x33 [ 107.560639][ C0] ? deliver_clone+0x69/0xc0 [ 107.565224][ C0] ? br_pass_frame_up+0x910/0x910 [ 107.570243][ C0] br_handle_frame_finish+0x6e0/0x16c0 [ 107.575716][ C0] ? br_handle_local_finish+0x20/0x20 [ 107.581074][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 107.587214][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.592274][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 107.597984][ C0] ? nf_hook_slow+0xf0/0x1e0 [ 107.602605][ C0] br_nf_hook_thresh+0x2e9/0x370 [ 107.607677][ C0] ? br_handle_local_finish+0x20/0x20 [ 107.613048][ C0] ? setup_pre_routing+0x4b0/0x4b0 [ 107.618162][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 107.624321][ C0] ? br_handle_local_finish+0x20/0x20 [ 107.629699][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.634729][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 107.640536][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 107.646458][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 107.652366][ C0] br_nf_pre_routing_finish_ipv6+0x6fa/0xdb0 [ 107.658342][ C0] ? br_handle_local_finish+0x20/0x20 [ 107.663716][ C0] ? __kasan_check_read+0x11/0x20 [ 107.668747][ C0] br_nf_pre_routing_ipv6+0x456/0x830 [ 107.674100][ C0] ? br_validate_ipv6+0xb80/0xb80 [ 107.679120][ C0] ? br_nf_pre_routing.cold+0x2d/0x2d [ 107.684468][ C0] ? rcu_read_lock_held+0x9c/0xb0 [ 107.689485][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 107.695717][ C0] ? skb_pull_rcsum+0x155/0x300 [ 107.700568][ C0] br_nf_pre_routing+0x1896/0x22b3 [ 107.705660][ C0] ? br_nf_pre_routing_finish+0x1790/0x1790 [ 107.711559][ C0] ? br_nf_pre_routing_finish+0x1790/0x1790 [ 107.717461][ C0] br_handle_frame+0x806/0x1340 [ 107.722306][ C0] ? br_handle_frame_finish+0x16c0/0x16c0 [ 107.728153][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 107.734390][ C0] ? br_handle_local_finish+0x20/0x20 [ 107.739750][ C0] ? rcu_read_lock_held_common+0x130/0x130 [ 107.745547][ C0] ? br_handle_frame_finish+0x16c0/0x16c0 [ 107.751252][ C0] __netif_receive_skb_core+0xfbc/0x30b0 [ 107.756867][ C0] ? lock_downgrade+0x920/0x920 [ 107.761710][ C0] ? __check_heap_object+0x50/0xb3 [ 107.766826][ C0] ? do_xdp_generic+0x50/0x50 [ 107.771490][ C0] ? __kasan_check_read+0x11/0x20 [ 107.776525][ C0] ? __lock_acquire+0x8a0/0x4a00 [ 107.781441][ C0] ? swake_up_one+0x4d/0x60 [ 107.785931][ C0] __netif_receive_skb_one_core+0xa8/0x1a0 [ 107.791721][ C0] ? __netif_receive_skb_one_core+0xa8/0x1a0 [ 107.797692][ C0] ? __netif_receive_skb_core+0x30b0/0x30b0 [ 107.803564][ C0] ? lock_acquire+0x190/0x410 [ 107.808220][ C0] ? process_backlog+0x1b5/0x780 [ 107.813138][ C0] __netif_receive_skb+0x2c/0x1d0 [ 107.818141][ C0] process_backlog+0x226/0x780 [ 107.822896][ C0] ? net_rx_action+0x27b/0x1120 [ 107.827729][ C0] ? lockdep_hardirqs_on+0x19e/0x5e0 [ 107.832993][ C0] net_rx_action+0x508/0x1120 [ 107.837655][ C0] ? napi_busy_loop+0x970/0x970 [ 107.842484][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 107.848067][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 107.854029][ C0] ? ip6_finish_output2+0x10d3/0x25c0 [ 107.859381][ C0] ? trace_hardirqs_on+0x67/0x240 [ 107.864430][ C0] __do_softirq+0x262/0x98c [ 107.868930][ C0] ? ip6_finish_output2+0x10d3/0x25c0 [ 107.874280][ C0] do_softirq_own_stack+0x2a/0x40 [ 107.879304][ C0] [ 107.882232][ C0] do_softirq.part.0+0x11a/0x170 [ 107.887155][ C0] __local_bh_enable_ip+0x211/0x270 [ 107.892348][ C0] ip6_finish_output2+0x1101/0x25c0 [ 107.897536][ C0] ? ip6_mtu+0x2e6/0x450 [ 107.901763][ C0] ? ip6_frag_next+0xb20/0xb20 [ 107.906506][ C0] ? lock_downgrade+0x920/0x920 [ 107.911362][ C0] ? __kasan_check_read+0x11/0x20 [ 107.916405][ C0] __ip6_finish_output+0x444/0xaa0 [ 107.921598][ C0] ? __ip6_finish_output+0x444/0xaa0 [ 107.926870][ C0] ip6_finish_output+0x38/0x1f0 [ 107.931723][ C0] ip6_output+0x25e/0x880 [ 107.936058][ C0] ? ip6_finish_output+0x1f0/0x1f0 [ 107.941163][ C0] ? __ip6_finish_output+0xaa0/0xaa0 [ 107.946439][ C0] ndisc_send_skb+0xf1f/0x1490 [ 107.951204][ C0] ? nf_hook.constprop.0+0x560/0x560 [ 107.956476][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 107.962704][ C0] ? skb_set_owner_w+0x265/0x410 [ 107.967632][ C0] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 107.973331][ C0] ndisc_send_ns+0x3a9/0x850 [ 107.977902][ C0] ? mark_held_locks+0xa4/0xf0 [ 107.982645][ C0] ? ndisc_netdev_event+0x5e0/0x5e0 [ 107.988074][ C0] ? lockdep_hardirqs_on+0x421/0x5e0 [ 107.993369][ C0] ? addrconf_dad_work+0xb2c/0x11d0 [ 107.998561][ C0] ? trace_hardirqs_on+0x67/0x240 [ 108.003580][ C0] ? addrconf_dad_work+0xb2c/0x11d0 [ 108.008765][ C0] addrconf_dad_work+0xbf3/0x11d0 [ 108.013860][ C0] ? addrconf_dad_completed+0xbb0/0xbb0 [ 108.019539][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 108.025526][ C0] ? trace_hardirqs_on+0x67/0x240 [ 108.030602][ C0] process_one_work+0xa05/0x17a0 [ 108.035549][ C0] ? mark_held_locks+0xf0/0xf0 [ 108.040315][ C0] ? pwq_dec_nr_in_flight+0x320/0x320 [ 108.045676][ C0] ? lock_acquire+0x190/0x410 [ 108.050363][ C0] worker_thread+0x98/0xe40 [ 108.054939][ C0] kthread+0x361/0x430 [ 108.059020][ C0] ? process_one_work+0x17a0/0x17a0 [ 108.064209][ C0] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 108.069924][ C0] ret_from_fork+0x24/0x30 [ 108.075536][ C0] Kernel Offset: disabled [ 108.079886][ C0] Rebooting in 86400 seconds..