[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 53.493202][ T27] audit: type=1800 audit(1582000397.146:25): pid=8732 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 53.512727][ T27] audit: type=1800 audit(1582000397.146:26): pid=8732 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 53.561932][ T27] audit: type=1800 audit(1582000397.146:27): pid=8732 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 '10.128.0.78' (ECDSA) to the list of known hosts. syzkaller login: [ 61.579670][ T8886] IPVS: ftp: loaded support on port[0] = 21 [ 61.621053][ T8886] chnl_net:caif_netlink_parms(): no params data found [ 61.654100][ T8886] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.661667][ T8886] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.670608][ T8886] device bridge_slave_0 entered promiscuous mode [ 61.678855][ T8886] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.686195][ T8886] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.693835][ T8886] device bridge_slave_1 entered promiscuous mode [ 61.709961][ T8886] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 61.720971][ T8886] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 61.738830][ T8886] team0: Port device team_slave_0 added [ 61.746353][ T8886] team0: Port device team_slave_1 added [ 61.759592][ T8886] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 61.766690][ T8886] 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. [ 61.793199][ T8886] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 61.805864][ T8886] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 61.813007][ T8886] 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. [ 61.839944][ T8886] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 61.901333][ T8886] device hsr_slave_0 entered promiscuous mode [ 61.949365][ T8886] device hsr_slave_1 entered promiscuous mode [ 62.041023][ T8886] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 62.081511][ T8886] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 62.141201][ T8886] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 62.181228][ T8886] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 62.232802][ T8886] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.239983][ T8886] bridge0: port 2(bridge_slave_1) entered forwarding state [ 62.247610][ T8886] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.255129][ T8886] bridge0: port 1(bridge_slave_0) entered forwarding state [ 62.292716][ T8886] 8021q: adding VLAN 0 to HW filter on device bond0 [ 62.305655][ T2819] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 62.316006][ T2819] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.324527][ T2819] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.332510][ T2819] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 62.345355][ T8886] 8021q: adding VLAN 0 to HW filter on device team0 [ 62.356550][ T2714] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 62.365600][ T2714] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.372813][ T2714] bridge0: port 1(bridge_slave_0) entered forwarding state [ 62.383796][ T2819] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 62.393820][ T2819] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.401023][ T2819] bridge0: port 2(bridge_slave_1) entered forwarding state [ 62.420100][ T2819] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 62.428804][ T2819] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 62.440790][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 62.448617][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 62.461743][ T2714] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 62.471873][ T8886] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 62.489748][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 62.497320][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 62.508873][ T8886] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 62.525877][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 62.542552][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 62.551663][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 62.560244][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 62.570791][ T8886] device veth0_vlan entered promiscuous mode [ 62.581745][ T8886] device veth1_vlan entered promiscuous mode [ 62.601745][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 62.610355][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 62.618618][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 62.629918][ T8886] device veth0_macvtap entered promiscuous mode [ 62.640187][ T8886] device veth1_macvtap entered promiscuous mode [ 62.655333][ T8886] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 62.662956][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 62.672258][ T2824] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 62.685855][ T8886] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 62.693863][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 62.702991][ T2701] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 62.879469][ C1] ================================================================== [ 62.887967][ C1] BUG: KASAN: use-after-free in find_match+0xb5/0xa10 [ 62.894945][ C1] Read of size 8 at addr ffff8880a458c320 by task ksoftirqd/1/16 [ 62.902743][ C1] [ 62.905057][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.6.0-rc2-syzkaller #0 [ 62.913295][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.923512][ C1] Call Trace: [ 62.926795][ C1] dump_stack+0x1fb/0x318 [ 62.931193][ C1] print_address_description+0x74/0x5c0 [ 62.936859][ C1] ? vprintk_default+0x28/0x30 [ 62.941615][ C1] ? vprintk_func+0x158/0x170 [ 62.946386][ C1] ? printk+0x62/0x8d [ 62.950358][ C1] __kasan_report+0x149/0x1c0 [ 62.955022][ C1] ? find_match+0xb5/0xa10 [ 62.959488][ C1] kasan_report+0x26/0x50 [ 62.963872][ C1] __asan_report_load8_noabort+0x14/0x20 [ 62.969508][ C1] find_match+0xb5/0xa10 [ 62.973750][ C1] __find_rr_leaf+0x1f6/0xb50 [ 62.978444][ C1] fib6_table_lookup+0x44f/0xb00 [ 62.983403][ C1] ip6_pol_route+0x187/0x1910 [ 62.988159][ C1] ip6_pol_route_input+0x54/0x80 [ 62.993189][ C1] ? ip6_route_input_lookup+0xd0/0xd0 [ 62.998594][ C1] fib6_rule_lookup+0x1e3/0x640 [ 63.003490][ C1] ip6_route_input+0x792/0xb20 [ 63.008311][ C1] ip6_rcv_finish_core+0x1f5/0x400 [ 63.013639][ C1] ip6_rcv_finish+0x138/0x260 [ 63.018318][ C1] ipv6_rcv+0xb0/0xe0 [ 63.022407][ C1] ? ip6_rcv_finish_core+0x400/0x400 [ 63.027701][ C1] __netif_receive_skb+0x136/0x370 [ 63.033070][ C1] process_backlog+0x4e8/0x980 [ 63.037846][ C1] net_rx_action+0x5ef/0x10c0 [ 63.042538][ C1] __do_softirq+0x283/0x7bd [ 63.047068][ C1] ? run_ksoftirqd+0x64/0xf0 [ 63.051795][ C1] run_ksoftirqd+0x64/0xf0 [ 63.056398][ C1] ? ksoftirqd_should_run+0x20/0x20 [ 63.061682][ C1] smpboot_thread_fn+0x5a0/0x990 [ 63.066642][ C1] kthread+0x332/0x350 [ 63.070700][ C1] ? cpu_report_death+0x120/0x120 [ 63.075714][ C1] ? kthread_blkcg+0xe0/0xe0 [ 63.080302][ C1] ret_from_fork+0x24/0x30 [ 63.084720][ C1] [ 63.087230][ C1] Allocated by task 8886: [ 63.091547][ C1] __kasan_kmalloc+0x118/0x1c0 [ 63.096581][ C1] kasan_kmalloc+0x9/0x10 [ 63.100910][ C1] __kmalloc_node+0x4d/0x60 [ 63.105459][ C1] kvmalloc_node+0x85/0x110 [ 63.109947][ C1] alloc_netdev_mqs+0x8e/0xd40 [ 63.114689][ C1] vti6_init_net+0x112/0x320 [ 63.119275][ C1] ops_init+0x355/0x430 [ 63.123442][ C1] setup_net+0x1eb/0x7f0 [ 63.127664][ C1] copy_net_ns+0x334/0x540 [ 63.132260][ C1] create_new_namespaces+0x4d7/0x9c0 [ 63.137691][ C1] unshare_nsproxy_namespaces+0x12a/0x190 [ 63.143396][ C1] ksys_unshare+0x478/0xa00 [ 63.147876][ C1] __x64_sys_unshare+0x38/0x40 [ 63.152637][ C1] do_syscall_64+0xf7/0x1c0 [ 63.157130][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.163099][ C1] [ 63.165456][ C1] Freed by task 8886: [ 63.169462][ C1] __kasan_slab_free+0x12e/0x1e0 [ 63.174567][ C1] kasan_slab_free+0xe/0x10 [ 63.180014][ C1] kfree+0x10d/0x220 [ 63.184017][ C1] netdev_name_node_alt_destroy+0x35c/0x380 [ 63.189901][ C1] rtnl_linkprop+0x42d/0x680 [ 63.194483][ C1] rtnl_dellinkprop+0x2a/0x40 [ 63.199144][ C1] rtnetlink_rcv_msg+0x889/0xd40 [ 63.204067][ C1] netlink_rcv_skb+0x19e/0x3e0 [ 63.208832][ C1] rtnetlink_rcv+0x1c/0x20 [ 63.213240][ C1] netlink_unicast+0x766/0x920 [ 63.217998][ C1] netlink_sendmsg+0xa2b/0xd40 [ 63.223027][ C1] ____sys_sendmsg+0x4f7/0x7f0 [ 63.227786][ C1] __sys_sendmsg+0x1ed/0x290 [ 63.232360][ C1] __x64_sys_sendmsg+0x7f/0x90 [ 63.237136][ C1] do_syscall_64+0xf7/0x1c0 [ 63.241631][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.247499][ C1] [ 63.249814][ C1] The buggy address belongs to the object at ffff8880a458c000 [ 63.249814][ C1] which belongs to the cache kmalloc-4k of size 4096 [ 63.264282][ C1] The buggy address is located 800 bytes inside of [ 63.264282][ C1] 4096-byte region [ffff8880a458c000, ffff8880a458d000) [ 63.277663][ C1] The buggy address belongs to the page: [ 63.283403][ C1] page:ffffea0002916300 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 [ 63.294325][ C1] flags: 0xfffe0000010200(slab|head) [ 63.299607][ C1] raw: 00fffe0000010200 ffffea000242a408 ffffea00025e8408 ffff8880aa402000 [ 63.308185][ C1] raw: 0000000000000000 ffff8880a458c000 0000000100000001 0000000000000000 [ 63.316755][ C1] page dumped because: kasan: bad access detected [ 63.323157][ C1] [ 63.325462][ C1] Memory state around the buggy address: [ 63.331313][ C1] ffff8880a458c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.339601][ C1] ffff8880a458c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.347668][ C1] >ffff8880a458c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.355719][ C1] ^ [ 63.360812][ C1] ffff8880a458c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.368862][ C1] ffff8880a458c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.377020][ C1] ================================================================== [ 63.385069][ C1] Disabling lock debugging due to kernel taint [ 63.391346][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 63.397931][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Tainted: G B 5.6.0-rc2-syzkaller #0 [ 63.407543][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.417587][ C1] Call Trace: [ 63.420869][ C1] dump_stack+0x1fb/0x318 [ 63.425312][ C1] panic+0x264/0x7a9 [ 63.429358][ C1] ? __kasan_report+0x193/0x1c0 [ 63.434259][ C1] ? trace_hardirqs_on+0x34/0x80 [ 63.439199][ C1] ? _raw_spin_unlock_irqrestore+0xa8/0xe0 [ 63.445203][ C1] __kasan_report+0x1b9/0x1c0 [ 63.449878][ C1] ? find_match+0xb5/0xa10 [ 63.454345][ C1] kasan_report+0x26/0x50 [ 63.458684][ C1] __asan_report_load8_noabort+0x14/0x20 [ 63.464492][ C1] find_match+0xb5/0xa10 [ 63.468755][ C1] __find_rr_leaf+0x1f6/0xb50 [ 63.473429][ C1] fib6_table_lookup+0x44f/0xb00 [ 63.478389][ C1] ip6_pol_route+0x187/0x1910 [ 63.483081][ C1] ip6_pol_route_input+0x54/0x80 [ 63.488056][ C1] ? ip6_route_input_lookup+0xd0/0xd0 [ 63.493521][ C1] fib6_rule_lookup+0x1e3/0x640 [ 63.498360][ C1] ip6_route_input+0x792/0xb20 [ 63.503113][ C1] ip6_rcv_finish_core+0x1f5/0x400 [ 63.508507][ C1] ip6_rcv_finish+0x138/0x260 [ 63.513226][ C1] ipv6_rcv+0xb0/0xe0 [ 63.517235][ C1] ? ip6_rcv_finish_core+0x400/0x400 [ 63.522504][ C1] __netif_receive_skb+0x136/0x370 [ 63.527645][ C1] process_backlog+0x4e8/0x980 [ 63.532406][ C1] net_rx_action+0x5ef/0x10c0 [ 63.537067][ C1] __do_softirq+0x283/0x7bd [ 63.541554][ C1] ? run_ksoftirqd+0x64/0xf0 [ 63.546189][ C1] run_ksoftirqd+0x64/0xf0 [ 63.550643][ C1] ? ksoftirqd_should_run+0x20/0x20 [ 63.555997][ C1] smpboot_thread_fn+0x5a0/0x990 [ 63.560936][ C1] kthread+0x332/0x350 [ 63.564993][ C1] ? cpu_report_death+0x120/0x120 [ 63.570091][ C1] ? kthread_blkcg+0xe0/0xe0 [ 63.574713][ C1] ret_from_fork+0x24/0x30 [ 63.580930][ C1] Kernel Offset: disabled [ 63.585347][ C1] Rebooting in 86400 seconds..