[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 51.435706][ T27] audit: type=1800 audit(1582296442.319:25): pid=8495 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 51.454848][ T27] audit: type=1800 audit(1582296442.319:26): pid=8495 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 51.479329][ T27] audit: type=1800 audit(1582296442.319:27): pid=8495 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts.
syzkaller login: [ 67.515156][ T8650] IPVS: ftp: loaded support on port[0] = 21
[ 67.555127][ T8650] chnl_net:caif_netlink_parms(): no params data found
[ 67.587360][ T8650] bridge0: port 1(bridge_slave_0) entered blocking state
[ 67.594691][ T8650] bridge0: port 1(bridge_slave_0) entered disabled state
[ 67.603221][ T8650] device bridge_slave_0 entered promiscuous mode
[ 67.611132][ T8650] bridge0: port 2(bridge_slave_1) entered blocking state
[ 67.618206][ T8650] bridge0: port 2(bridge_slave_1) entered disabled state
[ 67.626385][ T8650] device bridge_slave_1 entered promiscuous mode
[ 67.640976][ T8650] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 67.651724][ T8650] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 67.668687][ T8650] team0: Port device team_slave_0 added
[ 67.675504][ T8650] team0: Port device team_slave_1 added
[ 67.687903][ T8650] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 67.694890][ T8650] 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.
[ 67.720992][ T8650] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 67.733083][ T8650] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 67.740117][ T8650] 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.
[ 67.766229][ T8650] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 67.821151][ T8650] device hsr_slave_0 entered promiscuous mode
[ 67.849531][ T8650] device hsr_slave_1 entered promiscuous mode
[ 67.948737][ T8650] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 68.001927][ T8650] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 68.042004][ T8650] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 68.091752][ T8650] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 68.140745][ T8650] bridge0: port 2(bridge_slave_1) entered blocking state
[ 68.147857][ T8650] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 68.156019][ T8650] bridge0: port 1(bridge_slave_0) entered blocking state
[ 68.163121][ T8650] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 68.196993][ T8650] 8021q: adding VLAN 0 to HW filter on device bond0
[ 68.210841][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 68.220941][ T2991] bridge0: port 1(bridge_slave_0) entered disabled state
[ 68.228522][ T2991] bridge0: port 2(bridge_slave_1) entered disabled state
[ 68.236740][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[ 68.248227][ T8650] 8021q: adding VLAN 0 to HW filter on device team0
[ 68.259331][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 68.267566][ T2776] bridge0: port 1(bridge_slave_0) entered blocking state
[ 68.274651][ T2776] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 68.291305][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 68.299986][ T2991] bridge0: port 2(bridge_slave_1) entered blocking state
[ 68.307035][ T2991] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 68.317230][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 68.327290][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[ 68.336996][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 68.352227][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 68.360603][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[ 68.371331][ T8650] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[ 68.386547][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[ 68.394278][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[ 68.405078][ T8650] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 68.422596][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready
[ 68.439896][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
[ 68.448025][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
[ 68.456020][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
[ 68.464306][ T8650] device veth0_vlan entered promiscuous mode
[ 68.474613][ T8650] device veth1_vlan entered promiscuous mode
[ 68.493357][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
[ 68.501575][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
[ 68.511440][ T2991] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[ 68.521504][ T8650] device veth0_macvtap entered promiscuous mode
[ 68.530939][ T8650] device veth1_macvtap entered promiscuous mode
[ 68.544802][ T8650] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 68.552383][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[ 68.561899][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
[ 68.572799][ T8650] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 68.580910][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
[ 68.589834][ T2776] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
executing program
[ 68.750037][ C0] ==================================================================
[ 68.758205][ C0] BUG: KASAN: use-after-free in find_match+0xb5/0xa10
[ 68.765047][ C0] Read of size 8 at addr ffff888091db0320 by task kworker/0:21/2776
[ 68.773013][ C0]
[ 68.775331][ C0] CPU: 0 PID: 2776 Comm: kworker/0:21 Not tainted 5.6.0-rc2-syzkaller #0
[ 68.783724][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 68.793781][ C0] Workqueue: ipv6_addrconf addrconf_dad_work
[ 68.799747][ C0] Call Trace:
[ 68.803012][ C0]
[ 68.805860][ C0] dump_stack+0x1fb/0x318
[ 68.810180][ C0] print_address_description+0x74/0x5c0
[ 68.815711][ C0] ? vprintk_func+0x158/0x170
[ 68.820376][ C0] ? printk+0x62/0x8d
[ 68.824351][ C0] ? vprintk_emit+0x2d4/0x3a0
[ 68.829021][ C0] __kasan_report+0x149/0x1c0
[ 68.833688][ C0] ? find_match+0xb5/0xa10
[ 68.838090][ C0] kasan_report+0x26/0x50
[ 68.842408][ C0] __asan_report_load8_noabort+0x14/0x20
[ 68.848022][ C0] find_match+0xb5/0xa10
[ 68.852261][ C0] __find_rr_leaf+0x1f6/0xb50
[ 68.856939][ C0] fib6_table_lookup+0x44f/0xb00
[ 68.861900][ C0] ip6_pol_route+0x187/0x1910
[ 68.866575][ C0] ? __flow_hash_from_keys+0x491/0x910
[ 68.872028][ C0] ip6_pol_route_input+0x54/0x80
[ 68.876962][ C0] ? ip6_route_input_lookup+0xd0/0xd0
[ 68.882326][ C0] fib6_rule_lookup+0x1e3/0x640
[ 68.887182][ C0] ip6_route_input+0x792/0xb20
[ 68.891967][ C0] ip6_rcv_finish_core+0x1f5/0x400
[ 68.897064][ C0] ip6_rcv_finish+0x138/0x260
[ 68.901744][ C0] ipv6_rcv+0xb0/0xe0
[ 68.905710][ C0] ? ip6_rcv_finish_core+0x400/0x400
[ 68.910987][ C0] __netif_receive_skb+0x136/0x370
[ 68.916087][ C0] process_backlog+0x4e8/0x980
[ 68.920858][ C0] net_rx_action+0x5ef/0x10c0
[ 68.925539][ C0] __do_softirq+0x283/0x7bd
[ 68.930025][ C0] ? do_softirq_own_stack+0x2a/0x40
[ 68.935225][ C0] do_softirq_own_stack+0x2a/0x40
[ 68.940226][ C0]
[ 68.943148][ C0] do_softirq+0xfd/0x190
[ 68.947376][ C0] ? local_bh_enable+0x9/0x30
[ 68.952043][ C0] __local_bh_enable_ip+0x194/0x240
[ 68.957226][ C0] local_bh_enable+0x1f/0x30
[ 68.961797][ C0] ip6_finish_output2+0x10ca/0x13e0
[ 68.967001][ C0] __ip6_finish_output+0x693/0x8c0
[ 68.972117][ C0] ip6_finish_output+0x52/0x1e0
[ 68.976954][ C0] ? ip6_output+0x2ad/0x3c0
[ 68.981450][ C0] ip6_output+0x2c2/0x3c0
[ 68.985814][ C0] ndisc_send_skb+0xa33/0xe20
[ 68.990560][ C0] ndisc_send_ns+0x5c6/0x7b0
[ 68.995173][ C0] addrconf_dad_work+0xaa7/0x1c20
[ 69.000204][ C0] process_one_work+0x7f5/0x10f0
[ 69.005158][ C0] worker_thread+0xbbc/0x1630
[ 69.009860][ C0] kthread+0x332/0x350
[ 69.013913][ C0] ? rcu_lock_release+0x30/0x30
[ 69.018756][ C0] ? kthread_blkcg+0xe0/0xe0
[ 69.023341][ C0] ret_from_fork+0x24/0x30
[ 69.027753][ C0]
[ 69.030065][ C0] Allocated by task 8650:
[ 69.034383][ C0] __kasan_kmalloc+0x118/0x1c0
[ 69.039141][ C0] kasan_kmalloc+0x9/0x10
[ 69.043453][ C0] __kmalloc_node+0x4d/0x60
[ 69.047944][ C0] kvmalloc_node+0x85/0x110
[ 69.052428][ C0] alloc_netdev_mqs+0x8e/0xd40
[ 69.057192][ C0] vti6_init_net+0x112/0x320
[ 69.061768][ C0] ops_init+0x355/0x430
[ 69.065919][ C0] setup_net+0x1eb/0x7f0
[ 69.070142][ C0] copy_net_ns+0x334/0x540
[ 69.074555][ C0] create_new_namespaces+0x4d7/0x9c0
[ 69.079821][ C0] unshare_nsproxy_namespaces+0x12a/0x190
[ 69.085537][ C0] ksys_unshare+0x478/0xa00
[ 69.090034][ C0] __x64_sys_unshare+0x38/0x40
[ 69.094787][ C0] do_syscall_64+0xf7/0x1c0
[ 69.099322][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 69.105195][ C0]
[ 69.107501][ C0] Freed by task 8650:
[ 69.111473][ C0] __kasan_slab_free+0x12e/0x1e0
[ 69.116392][ C0] kasan_slab_free+0xe/0x10
[ 69.120881][ C0] kfree+0x10d/0x220
[ 69.124757][ C0] netdev_name_node_alt_destroy+0x35c/0x380
[ 69.130634][ C0] rtnl_linkprop+0x42d/0x680
[ 69.135212][ C0] rtnl_dellinkprop+0x2a/0x40
[ 69.139870][ C0] rtnetlink_rcv_msg+0x889/0xd40
[ 69.144795][ C0] netlink_rcv_skb+0x19e/0x3e0
[ 69.149540][ C0] rtnetlink_rcv+0x1c/0x20
[ 69.153949][ C0] netlink_unicast+0x766/0x920
[ 69.158692][ C0] netlink_sendmsg+0xa2b/0xd40
[ 69.163484][ C0] ____sys_sendmsg+0x4f7/0x7f0
[ 69.168239][ C0] __sys_sendmsg+0x1ed/0x290
[ 69.172820][ C0] __x64_sys_sendmsg+0x7f/0x90
[ 69.177566][ C0] do_syscall_64+0xf7/0x1c0
[ 69.182072][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 69.187945][ C0]
[ 69.190263][ C0] The buggy address belongs to the object at ffff888091db0000
[ 69.190263][ C0] which belongs to the cache kmalloc-4k of size 4096
[ 69.204304][ C0] The buggy address is located 800 bytes inside of
[ 69.204304][ C0] 4096-byte region [ffff888091db0000, ffff888091db1000)
[ 69.217748][ C0] The buggy address belongs to the page:
[ 69.223364][ C0] page:ffffea0002476c00 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0
[ 69.234278][ C0] flags: 0xfffe0000010200(slab|head)
[ 69.239652][ C0] raw: 00fffe0000010200 ffffea0002911c88 ffffea00029cc508 ffff8880aa402000
[ 69.248241][ C0] raw: 0000000000000000 ffff888091db0000 0000000100000001 0000000000000000
[ 69.256809][ C0] page dumped because: kasan: bad access detected
[ 69.263214][ C0]
[ 69.265529][ C0] Memory state around the buggy address:
[ 69.271144][ C0] ffff888091db0200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 69.279196][ C0] ffff888091db0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 69.287273][ C0] >ffff888091db0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 69.295334][ C0] ^
[ 69.300432][ C0] ffff888091db0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 69.308480][ C0] ffff888091db0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 69.316534][ C0] ==================================================================
[ 69.324589][ C0] Disabling lock debugging due to kernel taint
[ 69.330772][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 69.341078][ C0] CPU: 0 PID: 2776 Comm: kworker/0:21 Tainted: G B 5.6.0-rc2-syzkaller #0
[ 69.350858][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 69.360995][ C0] Workqueue: ipv6_addrconf addrconf_dad_work
[ 69.366956][ C0] Call Trace:
[ 69.370225][ C0]
[ 69.373069][ C0] dump_stack+0x1fb/0x318
[ 69.377382][ C0] panic+0x264/0x7a9
[ 69.381271][ C0] ? trace_hardirqs_on+0x34/0x80
[ 69.386199][ C0] ? __kasan_report+0x193/0x1c0
[ 69.391036][ C0] ? trace_hardirqs_on+0x34/0x80
[ 69.395960][ C0] __kasan_report+0x1b9/0x1c0
[ 69.400639][ C0] ? find_match+0xb5/0xa10
[ 69.405034][ C0] kasan_report+0x26/0x50
[ 69.410129][ C0] __asan_report_load8_noabort+0x14/0x20
[ 69.415745][ C0] find_match+0xb5/0xa10
[ 69.419979][ C0] __find_rr_leaf+0x1f6/0xb50
[ 69.424652][ C0] fib6_table_lookup+0x44f/0xb00
[ 69.429591][ C0] ip6_pol_route+0x187/0x1910
[ 69.434258][ C0] ? __flow_hash_from_keys+0x491/0x910
[ 69.439711][ C0] ip6_pol_route_input+0x54/0x80
[ 69.444636][ C0] ? ip6_route_input_lookup+0xd0/0xd0
[ 69.449990][ C0] fib6_rule_lookup+0x1e3/0x640
[ 69.454832][ C0] ip6_route_input+0x792/0xb20
[ 69.459598][ C0] ip6_rcv_finish_core+0x1f5/0x400
[ 69.464697][ C0] ip6_rcv_finish+0x138/0x260
[ 69.469358][ C0] ipv6_rcv+0xb0/0xe0
[ 69.475930][ C0] ? ip6_rcv_finish_core+0x400/0x400
[ 69.481285][ C0] __netif_receive_skb+0x136/0x370
[ 69.486390][ C0] process_backlog+0x4e8/0x980
[ 69.491142][ C0] net_rx_action+0x5ef/0x10c0
[ 69.495805][ C0] __do_softirq+0x283/0x7bd
[ 69.500289][ C0] ? do_softirq_own_stack+0x2a/0x40
[ 69.505480][ C0] do_softirq_own_stack+0x2a/0x40
[ 69.510491][ C0]
[ 69.513465][ C0] do_softirq+0xfd/0x190
[ 69.517697][ C0] ? local_bh_enable+0x9/0x30
[ 69.522348][ C0] __local_bh_enable_ip+0x194/0x240
[ 69.527557][ C0] local_bh_enable+0x1f/0x30
[ 69.532122][ C0] ip6_finish_output2+0x10ca/0x13e0
[ 69.537296][ C0] __ip6_finish_output+0x693/0x8c0
[ 69.542385][ C0] ip6_finish_output+0x52/0x1e0
[ 69.547207][ C0] ? ip6_output+0x2ad/0x3c0
[ 69.551695][ C0] ip6_output+0x2c2/0x3c0
[ 69.556002][ C0] ndisc_send_skb+0xa33/0xe20
[ 69.560662][ C0] ndisc_send_ns+0x5c6/0x7b0
[ 69.565228][ C0] addrconf_dad_work+0xaa7/0x1c20
[ 69.570226][ C0] process_one_work+0x7f5/0x10f0
[ 69.575138][ C0] worker_thread+0xbbc/0x1630
[ 69.579797][ C0] kthread+0x332/0x350
[ 69.583838][ C0] ? rcu_lock_release+0x30/0x30
[ 69.588660][ C0] ? kthread_blkcg+0xe0/0xe0
[ 69.593230][ C0] ret_from_fork+0x24/0x30
[ 69.598970][ C0] Kernel Offset: disabled
[ 69.603293][ C0] Rebooting in 86400 seconds..