[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.943022] audit_printk_skb: 24 callbacks suppressed [ 35.948212] audit: type=1800 audit(1581512560.440:29): pid=6843 uid=0 auid=4294967295 ses=4294967295 subj=_ op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 35.971347] audit: type=1800 audit(1581512560.470:30): pid=6843 uid=0 auid=4294967295 ses=4294967295 subj=_ op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 47.711550] IPVS: Creating netns size=2712 id=1 [ 47.716443] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.145' (ECDSA) to the list of known hosts. 2020/02/12 13:02:59 parsed 1 programs 2020/02/12 13:02:59 executed programs: 0 [ 55.442422] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 55.451294] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 55.460241] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 55.468135] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 55.476244] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 55.485112] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 55.503319] IPVS: Creating netns size=2712 id=2 [ 55.508095] IPVS: ftp: loaded support on port[0] = 21 [ 55.578847] IPVS: Creating netns size=2712 id=3 [ 55.583701] IPVS: ftp: loaded support on port[0] = 21 [ 55.716515] chnl_net:caif_netlink_parms(): no params data found [ 55.725159] IPVS: Creating netns size=2712 id=4 [ 55.730128] IPVS: ftp: loaded support on port[0] = 21 [ 55.920693] chnl_net:caif_netlink_parms(): no params data found [ 55.959779] IPVS: Creating netns size=2712 id=5 [ 55.964616] IPVS: ftp: loaded support on port[0] = 21 [ 56.049412] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.055839] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.064839] device bridge_slave_0 entered promiscuous mode [ 56.085414] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.092017] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.100946] device bridge_slave_1 entered promiscuous mode [ 56.240076] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.264522] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.315436] IPVS: Creating netns size=2712 id=6 [ 56.320787] IPVS: ftp: loaded support on port[0] = 21 [ 56.346829] chnl_net:caif_netlink_parms(): no params data found [ 56.422300] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.428876] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.437565] device bridge_slave_0 entered promiscuous mode [ 56.499540] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.506029] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.515171] device bridge_slave_1 entered promiscuous mode [ 56.593129] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 56.670071] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 56.702916] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.730477] IPVS: Creating netns size=2712 id=7 [ 56.735332] IPVS: ftp: loaded support on port[0] = 21 [ 56.761819] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.773700] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.797604] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.909230] chnl_net:caif_netlink_parms(): no params data found [ 57.125149] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 57.132273] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.138860] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.147778] device bridge_slave_0 entered promiscuous mode [ 57.174971] chnl_net:caif_netlink_parms(): no params data found [ 57.210519] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 57.217898] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.224653] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.233902] device bridge_slave_1 entered promiscuous mode [ 57.316057] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 57.334939] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.343929] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 57.397527] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.576688] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.583193] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.592104] device bridge_slave_0 entered promiscuous mode [ 57.632049] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.638985] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.650709] device bridge_slave_1 entered promiscuous mode [ 57.687652] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 57.776268] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 57.815634] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.833884] chnl_net:caif_netlink_parms(): no params data found [ 57.857940] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.975586] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.052354] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 58.134662] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.141281] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.150443] device bridge_slave_0 entered promiscuous mode [ 58.207775] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.214423] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.223144] device bridge_slave_1 entered promiscuous mode [ 58.368452] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 58.377397] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 58.385029] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 58.426101] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 58.438587] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.482900] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 58.597522] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 58.691892] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.698858] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.707530] device bridge_slave_0 entered promiscuous mode [ 58.758758] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.765140] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.774373] device bridge_slave_1 entered promiscuous mode [ 58.782420] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 58.834414] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 58.844809] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 58.852662] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.912194] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 58.948779] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.010269] ------------[ cut here ]------------ [ 59.015059] WARNING: CPU: 1 PID: 7101 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 59.022929] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 59.030056] Kernel panic - not syncing: panic_on_warn set ... [ 59.030056] [ 59.037408] CPU: 1 PID: 7101 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 59.045049] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.054382] 1ffffffff0d95756 ffff8800b77befb0 ffffffff82c74fc6 ffffffff85c81040 [ 59.062542] ffff8800b77bf088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b77bf078 [ 59.070635] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 59.078718] Call Trace: [ 59.081304] [] dump_stack+0xe6/0x120 [ 59.086665] [] ? sysfs_warn_dup+0x7b/0xa0 [ 59.092471] [] panic+0x1af/0x348 [ 59.097469] [] ? set_ti_thread_flag+0xf/0xf [ 59.103431] [] ? sysfs_warn_dup+0x7b/0xa0 [ 59.109280] [] __warn+0x18d/0x1b0 [ 59.114383] [] warn_slowpath_fmt+0x92/0xb0 [ 59.120247] [] ? __warn+0x1b0/0x1b0 [ 59.125557] [] ? kernfs_path_from_node+0x4a/0x60 [ 59.131984] [] sysfs_warn_dup+0x7b/0xa0 [ 59.137585] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 59.144599] [] sysfs_create_link+0x43/0xb0 [ 59.150465] [] device_add+0x689/0x1360 [ 59.155992] [] ? device_private_init+0x180/0x180 [ 59.162378] [] ? kfree_const+0x1d/0x20 [ 59.167905] [] ? kobject_set_name_vargs+0xb4/0x130 [ 59.174591] [] device_create_groups_vargs+0x1c8/0x220 [ 59.181406] [] device_create+0x88/0xa0 [ 59.186972] [] ? device_create_vargs+0x20/0x20 [ 59.193275] [] ? macvlan_set_mac_address+0x150/0x150 [ 59.200003] [] macvtap_device_event+0x1c4/0x2a0 [ 59.206297] [] notifier_call_chain+0x8b/0x170 [ 59.212423] [] raw_notifier_call_chain+0x11/0x20 [ 59.218824] [] call_netdevice_notifiers_info+0x47/0x80 [ 59.225731] [] register_netdevice+0x88a/0xce0 [ 59.231853] [] ? netdev_change_features+0x80/0x80 [ 59.238333] [] ? kmem_cache_alloc_trace+0x34f/0x6b0 [ 59.245022] [] ? dev_get_nest_level+0x10c/0x1a0 [ 59.251337] [] macvlan_common_newlink+0x8b9/0x1090 [ 59.257968] [] macvtap_newlink+0xbf/0x110 [ 59.265147] [] ? __netlink_ns_capable+0xc7/0xf0 [ 59.271490] [] rtnl_newlink+0xd4b/0x1230 [ 59.277186] [] ? rtnl_link_ops_get+0x5d/0x90 [ 59.283226] [] ? rtnl_newlink+0x319/0x1230 [ 59.289143] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 59.296834] [] ? rtnl_setlink+0x2f0/0x2f0 [ 59.302619] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 59.309614] [] ? set_next_entity+0x8f/0x410 [ 59.315579] [] ? __netlink_ns_capable+0xc7/0xf0 [ 59.322133] [] rtnetlink_rcv_msg+0x222/0x680 [ 59.328180] [] ? memset+0x28/0x30 [ 59.333268] [] ? rtnetlink_rcv+0x30/0x30 [ 59.339216] [] ? mutex_lock_nested+0x638/0xb30 [ 59.345429] [] ? rtnetlink_rcv+0x16/0x30 [ 59.351151] [] ? netlink_lookup+0xd4/0x630 [ 59.357022] [] netlink_rcv_skb+0x242/0x350 [ 59.364009] [] ? rtnetlink_rcv+0x30/0x30 [ 59.369719] [] rtnetlink_rcv+0x25/0x30 [ 59.375279] [] netlink_unicast+0x455/0x660 [ 59.381261] [] ? netlink_unicast+0x3b5/0x660 [ 59.387355] [] ? netlink_attachskb+0x730/0x730 [ 59.393657] [] netlink_sendmsg+0x893/0xb40 [ 59.399526] [] ? netlink_unicast+0x660/0x660 [ 59.405622] [] ? __might_fault+0xf1/0x1b0 [ 59.411404] [] ? security_socket_sendmsg+0x6a/0xa0 [ 59.417989] [] ? netlink_unicast+0x660/0x660 [ 59.424032] [] sock_sendmsg+0xb5/0xf0 [ 59.429465] [] SYSC_sendto+0x1c9/0x300 [ 59.435160] [] ? SYSC_connect+0x2a0/0x2a0 [ 59.440942] [] ? mnt_get_count+0x1c0/0x1c0 [ 59.446948] [] ? mntput_no_expire+0xb1/0x600 [ 59.452991] [] ? mntput_no_expire+0xce/0x600 [ 59.459030] [] ? mnt_get_count+0x1c0/0x1c0 [ 59.465045] [] ? mntput+0x52/0x70 [ 59.470172] [] ? ___might_sleep+0x331/0x440 [ 59.476136] [] ? trace_hardirqs_off+0xd/0x10 [ 59.482179] [] ? exit_to_usermode_loop+0xcb/0x1c0 [ 59.488653] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 59.495402] [] SyS_sendto+0x9/0x10 [ 59.500825] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 59.509529] Kernel Offset: disabled