[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.466485][ T27] audit: type=1800 audit(1582090173.822:25): pid=8736 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.497939][ T27] audit: type=1800 audit(1582090173.832:26): pid=8736 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.550449][ T27] audit: type=1800 audit(1582090173.832:27): pid=8736 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 '10.128.10.19' (ECDSA) to the list of known hosts. syzkaller login: [ 67.971559][ T8889] IPVS: ftp: loaded support on port[0] = 21 [ 68.022767][ T8889] chnl_net:caif_netlink_parms(): no params data found [ 68.057257][ T8889] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.064921][ T8889] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.072812][ T8889] device bridge_slave_0 entered promiscuous mode [ 68.081298][ T8889] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.089128][ T8889] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.097429][ T8889] device bridge_slave_1 entered promiscuous mode [ 68.112801][ T8889] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 68.123841][ T8889] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 68.142546][ T8889] team0: Port device team_slave_0 added [ 68.150120][ T8889] team0: Port device team_slave_1 added [ 68.164133][ T8889] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 68.171446][ T8889] 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. [ 68.197848][ T8889] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 68.210556][ T8889] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 68.218145][ T8889] 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. [ 68.245349][ T8889] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 68.319555][ T8889] device hsr_slave_0 entered promiscuous mode [ 68.357187][ T8889] device hsr_slave_1 entered promiscuous mode [ 68.449011][ T8889] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 68.499642][ T8889] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 68.548632][ T8889] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 68.589202][ T8889] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 68.650167][ T8889] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.657525][ T8889] bridge0: port 2(bridge_slave_1) entered forwarding state [ 68.665486][ T8889] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.672660][ T8889] bridge0: port 1(bridge_slave_0) entered forwarding state [ 68.712551][ T8889] 8021q: adding VLAN 0 to HW filter on device bond0 [ 68.724676][ T2765] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 68.734506][ T2765] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.743416][ T2765] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.751907][ T2765] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 68.764897][ T8889] 8021q: adding VLAN 0 to HW filter on device team0 [ 68.776513][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 68.785225][ T2975] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.792451][ T2975] bridge0: port 1(bridge_slave_0) entered forwarding state [ 68.803355][ T2765] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 68.812665][ T2765] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.819901][ T2765] bridge0: port 2(bridge_slave_1) entered forwarding state [ 68.839742][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 68.848650][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 68.864157][ T8889] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 68.876017][ T8889] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 68.889691][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 68.898023][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 68.907174][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 68.916207][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 68.931774][ T2765] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 68.939440][ T2765] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 68.952960][ T8889] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 68.970181][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 68.989011][ T2773] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 68.997816][ T2773] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 69.005560][ T2773] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 69.015823][ T8889] device veth0_vlan entered promiscuous mode [ 69.029604][ T8889] device veth1_vlan entered promiscuous mode [ 69.048956][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 69.059961][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 69.070768][ T8889] device veth0_macvtap entered promiscuous mode [ 69.081024][ T8889] device veth1_macvtap entered promiscuous mode [ 69.094944][ T8889] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 69.107274][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 69.115539][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 69.124523][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 69.133765][ T2975] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 69.146618][ T8889] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 69.154372][ T2773] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 69.163991][ T2773] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 69.347389][ C0] ================================================================== [ 69.355920][ C0] BUG: KASAN: use-after-free in find_match+0xb5/0xa10 [ 69.362787][ C0] Read of size 8 at addr ffff8880923b4320 by task kworker/0:21/2766 [ 69.370842][ C0] [ 69.373193][ C0] CPU: 0 PID: 2766 Comm: kworker/0:21 Not tainted 5.6.0-rc2-syzkaller #0 [ 69.381601][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.391686][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 69.397669][ C0] Call Trace: [ 69.400986][ C0] [ 69.403839][ C0] dump_stack+0x1fb/0x318 [ 69.408182][ C0] print_address_description+0x74/0x5c0 [ 69.413831][ C0] ? vprintk_func+0x158/0x170 [ 69.418522][ C0] ? printk+0x62/0x8d [ 69.422507][ C0] ? vprintk_emit+0x2d4/0x3a0 [ 69.427202][ C0] __kasan_report+0x149/0x1c0 [ 69.431881][ C0] ? find_match+0xb5/0xa10 [ 69.436304][ C0] kasan_report+0x26/0x50 [ 69.440638][ C0] __asan_report_load8_noabort+0x14/0x20 [ 69.446285][ C0] find_match+0xb5/0xa10 [ 69.451353][ C0] __find_rr_leaf+0x1f6/0xb50 [ 69.456034][ C0] fib6_table_lookup+0x44f/0xb00 [ 69.461008][ C0] ip6_pol_route+0x187/0x1910 [ 69.466379][ C0] ? __flow_hash_from_keys+0x491/0x910 [ 69.472739][ C0] ip6_pol_route_input+0x54/0x80 [ 69.477670][ C0] ? ip6_route_input_lookup+0xd0/0xd0 [ 69.483043][ C0] fib6_rule_lookup+0x1e3/0x640 [ 69.488016][ C0] ip6_route_input+0x792/0xb20 [ 69.492838][ C0] ip6_rcv_finish_core+0x1f5/0x400 [ 69.497963][ C0] ip6_rcv_finish+0x138/0x260 [ 69.503149][ C0] ipv6_rcv+0xb0/0xe0 [ 69.507312][ C0] ? ip6_rcv_finish_core+0x400/0x400 [ 69.512787][ C0] __netif_receive_skb+0x136/0x370 [ 69.517971][ C0] process_backlog+0x4e8/0x980 [ 69.522863][ C0] net_rx_action+0x5ef/0x10c0 [ 69.527645][ C0] __do_softirq+0x283/0x7bd [ 69.532159][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 69.537513][ C0] do_softirq_own_stack+0x2a/0x40 [ 69.542537][ C0] [ 69.545479][ C0] do_softirq+0xfd/0x190 [ 69.549717][ C0] ? local_bh_enable+0x9/0x30 [ 69.554415][ C0] __local_bh_enable_ip+0x194/0x240 [ 69.559645][ C0] local_bh_enable+0x1f/0x30 [ 69.564239][ C0] ip6_finish_output2+0x10ca/0x13e0 [ 69.569485][ C0] __ip6_finish_output+0x693/0x8c0 [ 69.574626][ C0] ip6_finish_output+0x52/0x1e0 [ 69.579487][ C0] ? ip6_output+0x2ad/0x3c0 [ 69.583994][ C0] ip6_output+0x2c2/0x3c0 [ 69.588343][ C0] ndisc_send_skb+0xa33/0xe20 [ 69.593054][ C0] ndisc_send_ns+0x5c6/0x7b0 [ 69.597652][ C0] addrconf_dad_work+0xaa7/0x1c20 [ 69.602685][ C0] process_one_work+0x7f5/0x10f0 [ 69.607669][ C0] worker_thread+0xbbc/0x1630 [ 69.612376][ C0] kthread+0x332/0x350 [ 69.616452][ C0] ? rcu_lock_release+0x30/0x30 [ 69.621295][ C0] ? kthread_blkcg+0xe0/0xe0 [ 69.625903][ C0] ret_from_fork+0x24/0x30 [ 69.630333][ C0] [ 69.632751][ C0] Allocated by task 8889: [ 69.637102][ C0] __kasan_kmalloc+0x118/0x1c0 [ 69.642319][ C0] kasan_kmalloc+0x9/0x10 [ 69.646632][ C0] __kmalloc_node+0x4d/0x60 [ 69.651232][ C0] kvmalloc_node+0x85/0x110 [ 69.656879][ C0] alloc_netdev_mqs+0x8e/0xd40 [ 69.661625][ C0] vti6_init_net+0x112/0x320 [ 69.666212][ C0] ops_init+0x355/0x430 [ 69.670369][ C0] setup_net+0x1eb/0x7f0 [ 69.674610][ C0] copy_net_ns+0x334/0x540 [ 69.679021][ C0] create_new_namespaces+0x4d7/0x9c0 [ 69.684337][ C0] unshare_nsproxy_namespaces+0x12a/0x190 [ 69.690072][ C0] ksys_unshare+0x478/0xa00 [ 69.694582][ C0] __x64_sys_unshare+0x38/0x40 [ 69.699532][ C0] do_syscall_64+0xf7/0x1c0 [ 69.704054][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.709963][ C0] [ 69.712304][ C0] Freed by task 8889: [ 69.716294][ C0] __kasan_slab_free+0x12e/0x1e0 [ 69.721245][ C0] kasan_slab_free+0xe/0x10 [ 69.725729][ C0] kfree+0x10d/0x220 [ 69.729713][ C0] netdev_name_node_alt_destroy+0x35c/0x380 [ 69.735751][ C0] rtnl_linkprop+0x42d/0x680 [ 69.740346][ C0] rtnl_dellinkprop+0x2a/0x40 [ 69.745012][ C0] rtnetlink_rcv_msg+0x889/0xd40 [ 69.750054][ C0] netlink_rcv_skb+0x19e/0x3e0 [ 69.754839][ C0] rtnetlink_rcv+0x1c/0x20 [ 69.759288][ C0] netlink_unicast+0x766/0x920 [ 69.764143][ C0] netlink_sendmsg+0xa2b/0xd40 [ 69.768907][ C0] ____sys_sendmsg+0x4f7/0x7f0 [ 69.773783][ C0] __sys_sendmsg+0x1ed/0x290 [ 69.778465][ C0] __x64_sys_sendmsg+0x7f/0x90 [ 69.783245][ C0] do_syscall_64+0xf7/0x1c0 [ 69.787737][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.793608][ C0] [ 69.796075][ C0] The buggy address belongs to the object at ffff8880923b4000 [ 69.796075][ C0] which belongs to the cache kmalloc-4k of size 4096 [ 69.810766][ C0] The buggy address is located 800 bytes inside of [ 69.810766][ C0] 4096-byte region [ffff8880923b4000, ffff8880923b5000) [ 69.824209][ C0] The buggy address belongs to the page: [ 69.829986][ C0] page:ffffea000248ed00 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 [ 69.841077][ C0] flags: 0xfffe0000010200(slab|head) [ 69.846445][ C0] raw: 00fffe0000010200 ffffea00029b4608 ffffea00029c9188 ffff8880aa402000 [ 69.855117][ C0] raw: 0000000000000000 ffff8880923b4000 0000000100000001 0000000000000000 [ 69.863697][ C0] page dumped because: kasan: bad access detected [ 69.870117][ C0] [ 69.872550][ C0] Memory state around the buggy address: [ 69.878301][ C0] ffff8880923b4200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.886371][ C0] ffff8880923b4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.894420][ C0] >ffff8880923b4300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.902488][ C0] ^ [ 69.907603][ C0] ffff8880923b4380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.915671][ C0] ffff8880923b4400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 69.923734][ C0] ================================================================== [ 69.931791][ C0] Disabling lock debugging due to kernel taint [ 69.937972][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 69.944561][ C0] CPU: 0 PID: 2766 Comm: kworker/0:21 Tainted: G B 5.6.0-rc2-syzkaller #0 [ 69.954553][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.964650][ C0] Workqueue: ipv6_addrconf addrconf_dad_work [ 69.970608][ C0] Call Trace: [ 69.973869][ C0] [ 69.976714][ C0] dump_stack+0x1fb/0x318 [ 69.981044][ C0] panic+0x264/0x7a9 [ 69.985093][ C0] ? trace_hardirqs_on+0x34/0x80 [ 69.990026][ C0] ? __kasan_report+0x193/0x1c0 [ 69.994857][ C0] ? trace_hardirqs_on+0x34/0x80 [ 69.999924][ C0] __kasan_report+0x1b9/0x1c0 [ 70.004606][ C0] ? find_match+0xb5/0xa10 [ 70.009012][ C0] kasan_report+0x26/0x50 [ 70.013324][ C0] __asan_report_load8_noabort+0x14/0x20 [ 70.018936][ C0] find_match+0xb5/0xa10 [ 70.023302][ C0] __find_rr_leaf+0x1f6/0xb50 [ 70.027986][ C0] fib6_table_lookup+0x44f/0xb00 [ 70.032914][ C0] ip6_pol_route+0x187/0x1910 [ 70.038192][ C0] ? __flow_hash_from_keys+0x491/0x910 [ 70.043755][ C0] ip6_pol_route_input+0x54/0x80 [ 70.048777][ C0] ? ip6_route_input_lookup+0xd0/0xd0 [ 70.054346][ C0] fib6_rule_lookup+0x1e3/0x640 [ 70.059386][ C0] ip6_route_input+0x792/0xb20 [ 70.064154][ C0] ip6_rcv_finish_core+0x1f5/0x400 [ 70.069265][ C0] ip6_rcv_finish+0x138/0x260 [ 70.073944][ C0] ipv6_rcv+0xb0/0xe0 [ 70.077912][ C0] ? ip6_rcv_finish_core+0x400/0x400 [ 70.083285][ C0] __netif_receive_skb+0x136/0x370 [ 70.088421][ C0] process_backlog+0x4e8/0x980 [ 70.093192][ C0] net_rx_action+0x5ef/0x10c0 [ 70.097859][ C0] __do_softirq+0x283/0x7bd [ 70.102412][ C0] ? do_softirq_own_stack+0x2a/0x40 [ 70.107607][ C0] do_softirq_own_stack+0x2a/0x40 [ 70.112956][ C0] [ 70.115876][ C0] do_softirq+0xfd/0x190 [ 70.120240][ C0] ? local_bh_enable+0x9/0x30 [ 70.124948][ C0] __local_bh_enable_ip+0x194/0x240 [ 70.130230][ C0] local_bh_enable+0x1f/0x30 [ 70.134809][ C0] ip6_finish_output2+0x10ca/0x13e0 [ 70.140046][ C0] __ip6_finish_output+0x693/0x8c0 [ 70.145157][ C0] ip6_finish_output+0x52/0x1e0 [ 70.150129][ C0] ? ip6_output+0x2ad/0x3c0 [ 70.154637][ C0] ip6_output+0x2c2/0x3c0 [ 70.159078][ C0] ndisc_send_skb+0xa33/0xe20 [ 70.163921][ C0] ndisc_send_ns+0x5c6/0x7b0 [ 70.168537][ C0] addrconf_dad_work+0xaa7/0x1c20 [ 70.173675][ C0] process_one_work+0x7f5/0x10f0 [ 70.178614][ C0] worker_thread+0xbbc/0x1630 [ 70.183292][ C0] kthread+0x332/0x350 [ 70.187402][ C0] ? rcu_lock_release+0x30/0x30 [ 70.192246][ C0] ? kthread_blkcg+0xe0/0xe0 [ 70.196830][ C0] ret_from_fork+0x24/0x30 [ 70.202878][ C0] Kernel Offset: disabled [ 70.207212][ C0] Rebooting in 86400 seconds..