[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 syzkaller login: [ 46.522740] IPVS: Creating netns size=2712 id=1 [ 46.527526] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.1.0' (ECDSA) to the list of known hosts. 2020/02/07 17:29:51 parsed 1 programs 2020/02/07 17:29:51 executed programs: 0 [ 54.300872] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 54.312291] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 54.320916] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 54.329513] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 54.337740] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 54.346820] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 54.358289] IPVS: Creating netns size=2712 id=2 [ 54.363028] IPVS: ftp: loaded support on port[0] = 21 [ 54.431741] IPVS: Creating netns size=2712 id=3 [ 54.436566] IPVS: ftp: loaded support on port[0] = 21 [ 54.560763] chnl_net:caif_netlink_parms(): no params data found [ 54.585714] IPVS: Creating netns size=2712 id=4 [ 54.591150] IPVS: ftp: loaded support on port[0] = 21 [ 54.780458] IPVS: Creating netns size=2712 id=5 [ 54.785401] IPVS: ftp: loaded support on port[0] = 21 [ 54.820027] chnl_net:caif_netlink_parms(): no params data found [ 54.920095] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.926536] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.935407] device bridge_slave_0 entered promiscuous mode [ 54.988709] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.995065] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.003905] device bridge_slave_1 entered promiscuous mode [ 55.118024] chnl_net:caif_netlink_parms(): no params data found [ 55.119755] IPVS: Creating netns size=2712 id=6 [ 55.119872] IPVS: ftp: loaded support on port[0] = 21 [ 55.144114] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 55.196803] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.205852] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.212378] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.221059] device bridge_slave_0 entered promiscuous mode [ 55.273354] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.279998] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.288905] device bridge_slave_1 entered promiscuous mode [ 55.431912] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 55.509877] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.555891] IPVS: Creating netns size=2712 id=7 [ 55.567353] IPVS: ftp: loaded support on port[0] = 21 [ 55.581562] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 55.591426] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 55.647848] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 55.655907] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 55.754544] chnl_net:caif_netlink_parms(): no params data found [ 55.925736] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 55.933420] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.940118] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.950490] device bridge_slave_0 entered promiscuous mode [ 55.963729] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 55.971277] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 55.996786] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.003239] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.012040] device bridge_slave_1 entered promiscuous mode [ 56.042335] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.156316] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.187250] chnl_net:caif_netlink_parms(): no params data found [ 56.204358] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.286598] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 56.324032] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 56.535786] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.542825] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.551977] device bridge_slave_0 entered promiscuous mode [ 56.575323] chnl_net:caif_netlink_parms(): no params data found [ 56.590735] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.602402] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.611487] device bridge_slave_1 entered promiscuous mode [ 56.743863] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.800518] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.818981] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.899675] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.997793] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.004171] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.013176] device bridge_slave_0 entered promiscuous mode [ 57.020869] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 57.060438] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.066808] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.077816] device bridge_slave_1 entered promiscuous mode [ 57.084742] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 57.187744] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.194143] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.203011] device bridge_slave_0 entered promiscuous mode [ 57.260797] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.267257] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.276023] device bridge_slave_1 entered promiscuous mode [ 57.284978] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.315131] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 57.355862] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.383428] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 57.438873] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 57.448474] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.513750] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.622285] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 57.747968] ------------[ cut here ]------------ [ 57.752726] WARNING: CPU: 1 PID: 6973 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 57.761194] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 57.768213] Kernel panic - not syncing: panic_on_warn set ... [ 57.768213] [ 57.775560] CPU: 1 PID: 6973 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 57.783096] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.792432] 1ffffffff0d95756 ffff8800b50aefb0 ffffffff82c74fc6 ffffffff85c81040 [ 57.800478] ffff8800b50af088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b50af078 [ 57.808507] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 57.816505] Call Trace: [ 57.819078] [] dump_stack+0xe6/0x120 [ 57.824419] [] ? sysfs_warn_dup+0x7b/0xa0 [ 57.830193] [] panic+0x1af/0x348 [ 57.835184] [] ? set_ti_thread_flag+0xf/0xf [ 57.841130] [] ? sysfs_warn_dup+0x7b/0xa0 [ 57.846948] [] __warn+0x18d/0x1b0 [ 57.852035] [] warn_slowpath_fmt+0x92/0xb0 [ 57.858003] [] ? __warn+0x1b0/0x1b0 [ 57.863332] [] ? kernfs_path_from_node+0x4a/0x60 [ 57.869746] [] sysfs_warn_dup+0x7b/0xa0 [ 57.875802] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 57.882793] [] sysfs_create_link+0x43/0xb0 [ 57.888667] [] device_add+0x689/0x1360 [ 57.894190] [] ? device_private_init+0x180/0x180 [ 57.900618] [] ? kfree_const+0x1d/0x20 [ 57.906132] [] ? kobject_set_name_vargs+0xb4/0x130 [ 57.912685] [] device_create_groups_vargs+0x1c8/0x220 [ 57.919506] [] device_create+0x88/0xa0 [ 57.925059] [] ? device_create_vargs+0x20/0x20 [ 57.931381] [] ? macvlan_set_mac_address+0x150/0x150 [ 57.938110] [] macvtap_device_event+0x1c4/0x2a0 [ 57.944407] [] notifier_call_chain+0x8b/0x170 [ 57.950525] [] raw_notifier_call_chain+0x11/0x20 [ 57.956945] [] call_netdevice_notifiers_info+0x47/0x80 [ 57.963856] [] register_netdevice+0x88a/0xce0 [ 57.970018] [] ? netdev_change_features+0x80/0x80 [ 57.976484] [] ? kmem_cache_alloc_trace+0x34f/0x6b0 [ 57.983127] [] ? dev_get_nest_level+0x10c/0x1a0 [ 57.989432] [] macvlan_common_newlink+0x8b9/0x1090 [ 57.996001] [] macvtap_newlink+0xbf/0x110 [ 58.001810] [] ? __netlink_ns_capable+0xc7/0xf0 [ 58.008149] [] rtnl_newlink+0xd4b/0x1230 [ 58.013995] [] ? rtnl_link_ops_get+0x5d/0x90 [ 58.020034] [] ? rtnl_newlink+0x319/0x1230 [ 58.026087] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 58.033088] [] ? rtnl_setlink+0x2f0/0x2f0 [ 58.038865] [] ? sched_clock_cpu+0x152/0x1e0 [ 58.044897] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 58.051890] [] ? set_next_entity+0x8f/0x410 [ 58.057840] [] ? __netlink_ns_capable+0xc7/0xf0 [ 58.064142] [] rtnetlink_rcv_msg+0x222/0x680 [ 58.070176] [] ? memset+0x28/0x30 [ 58.075254] [] ? rtnetlink_rcv+0x30/0x30 [ 58.080941] [] ? mutex_lock_nested+0x638/0xb30 [ 58.087153] [] ? rtnetlink_rcv+0x16/0x30 [ 58.092859] [] ? netlink_lookup+0xd4/0x630 [ 58.098718] [] netlink_rcv_skb+0x242/0x350 [ 58.104578] [] ? rtnetlink_rcv+0x30/0x30 [ 58.110262] [] rtnetlink_rcv+0x25/0x30 [ 58.115860] [] netlink_unicast+0x455/0x660 [ 58.121734] [] ? netlink_unicast+0x3b5/0x660 [ 58.127770] [] ? netlink_attachskb+0x730/0x730 [ 58.133974] [] netlink_sendmsg+0x893/0xb40 [ 58.139829] [] ? netlink_unicast+0x660/0x660 [ 58.145861] [] ? __might_fault+0xf1/0x1b0 [ 58.151651] [] ? security_socket_sendmsg+0x6a/0xa0 [ 58.158202] [] ? netlink_unicast+0x660/0x660 [ 58.164236] [] sock_sendmsg+0xb5/0xf0 [ 58.169834] [] SYSC_sendto+0x1c9/0x300 [ 58.175344] [] ? SYSC_connect+0x2a0/0x2a0 [ 58.181119] [] ? mnt_get_count+0x1c0/0x1c0 [ 58.186990] [] ? mntput_no_expire+0xb1/0x600 [ 58.193027] [] ? mntput_no_expire+0xce/0x600 [ 58.199122] [] ? mnt_get_count+0x1c0/0x1c0 [ 58.204985] [] ? mntput+0x52/0x70 [ 58.210066] [] ? ___might_sleep+0x331/0x440 [ 58.216010] [] ? trace_hardirqs_off+0xd/0x10 [ 58.222097] [] ? exit_to_usermode_loop+0xcb/0x1c0 [ 58.228617] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 58.235171] [] SyS_sendto+0x9/0x10 [ 58.240336] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 58.248033] Kernel Offset: disabled