[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.521042][ T23] audit: type=1800 audit(1581993409.489:25): pid=8701 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.540268][ T23] audit: type=1800 audit(1581993409.499:26): pid=8701 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.586195][ T23] audit: type=1800 audit(1581993409.499:27): pid=8701 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.106' (ECDSA) to the list of known hosts. syzkaller login: [ 67.531644][ T8854] IPVS: ftp: loaded support on port[0] = 21 [ 67.574419][ T8854] chnl_net:caif_netlink_parms(): no params data found [ 67.609216][ T8854] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.616960][ T8854] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.625131][ T8854] device bridge_slave_0 entered promiscuous mode [ 67.633699][ T8854] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.640830][ T8854] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.648777][ T8854] device bridge_slave_1 entered promiscuous mode [ 67.664357][ T8854] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 67.675382][ T8854] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 67.693038][ T8854] team0: Port device team_slave_0 added [ 67.700377][ T8854] team0: Port device team_slave_1 added [ 67.714115][ T8854] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 67.721081][ T8854] 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. [ 67.747254][ T8854] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 67.759261][ T8854] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 67.766416][ T8854] 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. [ 67.793117][ T8854] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 67.863367][ T8854] device hsr_slave_0 entered promiscuous mode [ 67.901663][ T8854] device hsr_slave_1 entered promiscuous mode [ 67.993893][ T8854] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 68.033617][ T8854] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 68.084064][ T8854] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 68.123115][ T8854] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 68.194601][ T8854] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.201803][ T8854] bridge0: port 2(bridge_slave_1) entered forwarding state [ 68.209557][ T8854] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.216720][ T8854] bridge0: port 1(bridge_slave_0) entered forwarding state [ 68.255803][ T8854] 8021q: adding VLAN 0 to HW filter on device bond0 [ 68.268518][ T2896] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 68.278718][ T2896] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.287009][ T2896] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.295135][ T2896] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 68.308566][ T8854] 8021q: adding VLAN 0 to HW filter on device team0 [ 68.319347][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 68.328241][ T2749] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.335345][ T2749] bridge0: port 1(bridge_slave_0) entered forwarding state [ 68.352945][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 68.361634][ T2749] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.368705][ T2749] bridge0: port 2(bridge_slave_1) entered forwarding state [ 68.387093][ T8854] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 68.397887][ T8854] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 68.410615][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 68.419311][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 68.428521][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 68.438305][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 68.447491][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 68.455231][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 68.472506][ T2747] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 68.480039][ T2747] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 68.493182][ T8854] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 68.510741][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 68.529085][ T8854] device veth0_vlan entered promiscuous mode [ 68.536662][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 68.546073][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 68.553989][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 68.566609][ T8854] device veth1_vlan entered promiscuous mode [ 68.585975][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 68.594935][ T2694] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 68.605533][ T8854] device veth0_macvtap entered promiscuous mode [ 68.615820][ T8854] device veth1_macvtap entered promiscuous mode [ 68.630572][ T8854] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 68.639015][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 68.647657][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 68.655789][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 68.666076][ T2749] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 68.678910][ T8854] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 68.687674][ T2896] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 68.697482][ T2896] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 68.891613][ C0] ================================================================== [ 68.900072][ C0] BUG: KASAN: use-after-free in find_match+0xb5/0xa10 [ 68.906866][ C0] Read of size 8 at addr ffff88808e766320 by task kworker/0:76/2896 [ 68.915083][ C0] [ 68.917410][ C0] CPU: 0 PID: 2896 Comm: kworker/0:76 Not tainted 5.6.0-rc2-syzkaller #0 [ 68.925803][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.936000][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 68.942138][ C0] Call Trace: [ 68.945500][ C0] [ 68.948340][ C0] dump_stack+0x1fb/0x318 [ 68.952666][ C0] print_address_description+0x74/0x5c0 [ 68.958334][ C0] ? vprintk_func+0x158/0x170 [ 68.963025][ C0] ? printk+0x62/0x8d [ 68.967018][ C0] ? vprintk_emit+0x2d4/0x3a0 [ 68.971778][ C0] __kasan_report+0x149/0x1c0 [ 68.976455][ C0] ? find_match+0xb5/0xa10 [ 68.980927][ C0] kasan_report+0x26/0x50 [ 68.985324][ C0] __asan_report_load8_noabort+0x14/0x20 [ 68.991097][ C0] find_match+0xb5/0xa10 [ 68.995334][ C0] __find_rr_leaf+0x1f6/0xb50 [ 69.000002][ C0] fib6_table_lookup+0x44f/0xb00 [ 69.004948][ C0] ip6_pol_route+0x187/0x1910 [ 69.009623][ C0] ? __flow_hash_from_keys+0x491/0x910 [ 69.015087][ C0] ip6_pol_route_input+0x54/0x80 [ 69.020057][ C0] ? ip6_route_input_lookup+0xd0/0xd0 [ 69.025466][ C0] fib6_rule_lookup+0x1e3/0x640 [ 69.030322][ C0] ip6_route_input+0x792/0xb20 [ 69.035136][ C0] ip6_rcv_finish_core+0x1f5/0x400 [ 69.040241][ C0] ip6_rcv_finish+0x138/0x260 [ 69.044899][ C0] ipv6_rcv+0xb0/0xe0 [ 69.048915][ C0] ? ip6_rcv_finish_core+0x400/0x400 [ 69.054209][ C0] __netif_receive_skb+0x136/0x370 [ 69.059405][ C0] process_backlog+0x4e8/0x980 [ 69.064236][ C0] net_rx_action+0x5ef/0x10c0 [ 69.068921][ C0] __do_softirq+0x283/0x7bd [ 69.073417][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 69.078756][ C0] do_softirq_own_stack+0x2a/0x40 [ 69.083765][ C0] [ 69.086695][ C0] do_softirq+0xfd/0x190 [ 69.090956][ C0] ? local_bh_enable+0x9/0x30 [ 69.095622][ C0] __local_bh_enable_ip+0x194/0x240 [ 69.100826][ C0] local_bh_enable+0x1f/0x30 [ 69.105408][ C0] ip6_finish_output2+0x10ca/0x13e0 [ 69.110624][ C0] __ip6_finish_output+0x693/0x8c0 [ 69.115991][ C0] ip6_finish_output+0x52/0x1e0 [ 69.120830][ C0] ? ip6_output+0x2ad/0x3c0 [ 69.125587][ C0] ip6_output+0x2c2/0x3c0 [ 69.129906][ C0] ndisc_send_skb+0xa33/0xe20 [ 69.134620][ C0] ndisc_send_ns+0x5c6/0x7b0 [ 69.139219][ C0] addrconf_dad_work+0xaa7/0x1c20 [ 69.144266][ C0] process_one_work+0x7f5/0x10f0 [ 69.149505][ C0] worker_thread+0xbbc/0x1630 [ 69.154252][ C0] kthread+0x332/0x350 [ 69.158313][ C0] ? rcu_lock_release+0x30/0x30 [ 69.163166][ C0] ? kthread_blkcg+0xe0/0xe0 [ 69.167774][ C0] ret_from_fork+0x24/0x30 [ 69.172185][ C0] [ 69.174505][ C0] Allocated by task 8854: [ 69.178822][ C0] __kasan_kmalloc+0x118/0x1c0 [ 69.183575][ C0] kasan_kmalloc+0x9/0x10 [ 69.191905][ C0] __kmalloc_node+0x4d/0x60 [ 69.196387][ C0] kvmalloc_node+0x85/0x110 [ 69.200888][ C0] alloc_netdev_mqs+0x8e/0xd40 [ 69.205646][ C0] vti6_init_net+0x112/0x320 [ 69.210322][ C0] ops_init+0x355/0x430 [ 69.214566][ C0] setup_net+0x1eb/0x7f0 [ 69.218791][ C0] copy_net_ns+0x334/0x540 [ 69.223202][ C0] create_new_namespaces+0x4d7/0x9c0 [ 69.228484][ C0] unshare_nsproxy_namespaces+0x12a/0x190 [ 69.234350][ C0] ksys_unshare+0x478/0xa00 [ 69.239033][ C0] __x64_sys_unshare+0x38/0x40 [ 69.243801][ C0] do_syscall_64+0xf7/0x1c0 [ 69.248342][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.254254][ C0] [ 69.256677][ C0] Freed by task 8854: [ 69.260777][ C0] __kasan_slab_free+0x12e/0x1e0 [ 69.267281][ C0] kasan_slab_free+0xe/0x10 [ 69.271788][ C0] kfree+0x10d/0x220 [ 69.275924][ C0] netdev_name_node_alt_destroy+0x35c/0x380 [ 69.281912][ C0] rtnl_linkprop+0x42d/0x680 [ 69.286593][ C0] rtnl_dellinkprop+0x2a/0x40 [ 69.291452][ C0] rtnetlink_rcv_msg+0x889/0xd40 [ 69.296519][ C0] netlink_rcv_skb+0x19e/0x3e0 [ 69.301291][ C0] rtnetlink_rcv+0x1c/0x20 [ 69.306076][ C0] netlink_unicast+0x766/0x920 [ 69.311037][ C0] netlink_sendmsg+0xa2b/0xd40 [ 69.315780][ C0] ____sys_sendmsg+0x4f7/0x7f0 [ 69.320574][ C0] __sys_sendmsg+0x1ed/0x290 [ 69.325159][ C0] __x64_sys_sendmsg+0x7f/0x90 [ 69.330027][ C0] do_syscall_64+0xf7/0x1c0 [ 69.334530][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.340395][ C0] [ 69.342701][ C0] The buggy address belongs to the object at ffff88808e766000 [ 69.342701][ C0] which belongs to the cache kmalloc-4k of size 4096 [ 69.383519][ C0] The buggy address is located 800 bytes inside of [ 69.383519][ C0] 4096-byte region [ffff88808e766000, ffff88808e767000) [ 69.396986][ C0] The buggy address belongs to the page: [ 69.402606][ C0] page:ffffea000239d980 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 [ 69.413532][ C0] flags: 0xfffe0000010200(slab|head) [ 69.418793][ C0] raw: 00fffe0000010200 ffffea0002785a88 ffffea00027c0d88 ffff8880aa402000 [ 69.427367][ C0] raw: 0000000000000000 ffff88808e766000 0000000100000001 0000000000000000 [ 69.436024][ C0] page dumped because: kasan: bad access detected [ 69.442544][ C0] [ 69.444858][ C0] Memory state around the buggy address: [ 69.450835][ C0] ffff88808e766200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.458888][ C0] ffff88808e766280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.467231][ C0] >ffff88808e766300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.475392][ C0] ^ [ 69.480497][ C0] ffff88808e766380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.488854][ C0] ffff88808e766400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.497425][ C0] ================================================================== [ 69.505677][ C0] Disabling lock debugging due to kernel taint [ 69.513754][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 69.521126][ C0] CPU: 0 PID: 2896 Comm: kworker/0:76 Tainted: G B 5.6.0-rc2-syzkaller #0 [ 69.531003][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.541815][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 69.547789][ C0] Call Trace: [ 69.551063][ C0] [ 69.554039][ C0] dump_stack+0x1fb/0x318 [ 69.558393][ C0] panic+0x264/0x7a9 [ 69.562277][ C0] ? trace_hardirqs_on+0x34/0x80 [ 69.567326][ C0] ? __kasan_report+0x193/0x1c0 [ 69.572176][ C0] ? trace_hardirqs_on+0x34/0x80 [ 69.577123][ C0] __kasan_report+0x1b9/0x1c0 [ 69.582230][ C0] ? find_match+0xb5/0xa10 [ 69.586741][ C0] kasan_report+0x26/0x50 [ 69.591073][ C0] __asan_report_load8_noabort+0x14/0x20 [ 69.596705][ C0] find_match+0xb5/0xa10 [ 69.600952][ C0] __find_rr_leaf+0x1f6/0xb50 [ 69.605647][ C0] fib6_table_lookup+0x44f/0xb00 [ 69.610608][ C0] ip6_pol_route+0x187/0x1910 [ 69.615482][ C0] ? __flow_hash_from_keys+0x491/0x910 [ 69.620951][ C0] ip6_pol_route_input+0x54/0x80 [ 69.625898][ C0] ? ip6_route_input_lookup+0xd0/0xd0 [ 69.631269][ C0] fib6_rule_lookup+0x1e3/0x640 [ 69.636232][ C0] ip6_route_input+0x792/0xb20 [ 69.641020][ C0] ip6_rcv_finish_core+0x1f5/0x400 [ 69.646163][ C0] ip6_rcv_finish+0x138/0x260 [ 69.650850][ C0] ipv6_rcv+0xb0/0xe0 [ 69.654865][ C0] ? ip6_rcv_finish_core+0x400/0x400 [ 69.660177][ C0] __netif_receive_skb+0x136/0x370 [ 69.665380][ C0] process_backlog+0x4e8/0x980 [ 69.670507][ C0] net_rx_action+0x5ef/0x10c0 [ 69.675401][ C0] __do_softirq+0x283/0x7bd [ 69.679939][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 69.685144][ C0] do_softirq_own_stack+0x2a/0x40 [ 69.690379][ C0] [ 69.693339][ C0] do_softirq+0xfd/0x190 [ 69.697588][ C0] ? local_bh_enable+0x9/0x30 [ 69.702258][ C0] __local_bh_enable_ip+0x194/0x240 [ 69.707564][ C0] local_bh_enable+0x1f/0x30 [ 69.712152][ C0] ip6_finish_output2+0x10ca/0x13e0 [ 69.717361][ C0] __ip6_finish_output+0x693/0x8c0 [ 69.722471][ C0] ip6_finish_output+0x52/0x1e0 [ 69.727677][ C0] ? ip6_output+0x2ad/0x3c0 [ 69.732182][ C0] ip6_output+0x2c2/0x3c0 [ 69.736706][ C0] ndisc_send_skb+0xa33/0xe20 [ 69.741389][ C0] ndisc_send_ns+0x5c6/0x7b0 [ 69.745986][ C0] addrconf_dad_work+0xaa7/0x1c20 [ 69.751014][ C0] process_one_work+0x7f5/0x10f0 [ 69.755986][ C0] worker_thread+0xbbc/0x1630 [ 69.761289][ C0] kthread+0x332/0x350 [ 69.767184][ C0] ? rcu_lock_release+0x30/0x30 [ 69.772030][ C0] ? kthread_blkcg+0xe0/0xe0 [ 69.776609][ C0] ret_from_fork+0x24/0x30 [ 69.782592][ C0] Kernel Offset: disabled [ 69.786948][ C0] Rebooting in 86400 seconds..