Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 33.211023] IPVS: Creating netns size=2712 id=1 [ 33.215771] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.226' (ECDSA) to the list of known hosts. 2020/08/11 18:36:08 parsed 1 programs 2020/08/11 18:36:08 executed programs: 0 [ 41.203026] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 41.242422] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 41.257942] IPVS: Creating netns size=2712 id=2 [ 41.263974] IPVS: ftp: loaded support on port[0] = 21 [ 41.266460] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 41.271756] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 41.276769] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 41.282547] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 41.365055] IPVS: Creating netns size=2712 id=3 [ 41.370884] IPVS: ftp: loaded support on port[0] = 21 [ 41.508516] chnl_net:caif_netlink_parms(): no params data found [ 41.549900] IPVS: Creating netns size=2712 id=4 [ 41.554726] IPVS: ftp: loaded support on port[0] = 21 [ 41.692987] chnl_net:caif_netlink_parms(): no params data found [ 41.820688] IPVS: Creating netns size=2712 id=5 [ 41.825783] IPVS: ftp: loaded support on port[0] = 21 [ 41.845644] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.852654] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.862091] device bridge_slave_0 entered promiscuous mode [ 41.876578] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.883062] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.892446] device bridge_slave_1 entered promiscuous mode [ 41.999870] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.047044] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.083809] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.090281] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.099893] device bridge_slave_0 entered promiscuous mode [ 42.189786] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.196263] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.205559] device bridge_slave_1 entered promiscuous mode [ 42.299001] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.320557] IPVS: Creating netns size=2712 id=6 [ 42.325378] IPVS: ftp: loaded support on port[0] = 21 [ 42.366976] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.394584] chnl_net:caif_netlink_parms(): no params data found [ 42.409451] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 42.446159] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 42.550092] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.561540] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.728931] chnl_net:caif_netlink_parms(): no params data found [ 42.751880] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 42.780343] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 42.821002] IPVS: Creating netns size=2712 id=7 [ 42.826143] IPVS: ftp: loaded support on port[0] = 21 [ 42.870325] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.961016] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.988967] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.995354] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.004843] device bridge_slave_0 entered promiscuous mode [ 43.054243] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.060692] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.070710] device bridge_slave_1 entered promiscuous mode [ 43.258653] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.267219] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.320685] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.329125] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.386070] chnl_net:caif_netlink_parms(): no params data found [ 43.427525] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.433950] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.443389] device bridge_slave_0 entered promiscuous mode [ 43.451528] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.458448] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.467051] device bridge_slave_1 entered promiscuous mode [ 43.733358] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.839281] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.859751] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.924508] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.099467] chnl_net:caif_netlink_parms(): no params data found [ 44.114721] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.121315] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.130543] device bridge_slave_0 entered promiscuous mode [ 44.171149] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.178127] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.186723] device bridge_slave_1 entered promiscuous mode [ 44.216184] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.240916] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.300784] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.317648] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.345121] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.354969] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.404174] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.553673] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.642732] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.686403] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.704973] ------------[ cut here ]------------ [ 44.709815] WARNING: CPU: 1 PID: 5892 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 44.718157] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 44.725154] Kernel panic - not syncing: panic_on_warn set ... [ 44.725154] [ 44.732489] CPU: 1 PID: 5892 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 44.740029] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.749355] 0000000000000000 ffff8800b1d76fc8 ffffffff82c65e52 ffffffff85c81040 [ 44.757381] ffff8800b1d770a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 44.765421] ffff8800b1d77090 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a [ 44.773400] Call Trace: [ 44.775960] [] dump_stack+0x136/0x1d4 [ 44.781382] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.787148] [] panic+0x1af/0x348 [ 44.792132] [] ? to_vmem_altmap+0x125/0x125 [ 44.798072] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.803851] [] __warn+0x18d/0x1b0 [ 44.808931] [] warn_slowpath_fmt+0x92/0xb0 [ 44.814821] [] ? __warn+0x1b0/0x1b0 [ 44.820069] [] ? kernfs_path_from_node+0x4a/0x60 [ 44.826473] [] sysfs_warn_dup+0x7b/0xa0 [ 44.832102] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 44.839084] [] sysfs_create_link+0x43/0xb0 [ 44.844936] [] device_add+0x677/0x1350 [ 44.850444] [] ? device_private_init+0x180/0x180 [ 44.856824] [] ? kfree_const+0x1d/0x20 [ 44.862393] [] ? kobject_set_name_vargs+0xb4/0x130 [ 44.868939] [] device_create_groups_vargs+0x1c8/0x220 [ 44.875760] [] device_create+0x88/0xa0 [ 44.881280] [] ? device_create_vargs+0x20/0x20 [ 44.887500] [] ? macvlan_set_mac_address+0x150/0x150 [ 44.894267] [] macvtap_device_event+0x1c4/0x2a0 [ 44.900560] [] notifier_call_chain+0x8b/0x170 [ 44.906680] [] raw_notifier_call_chain+0x11/0x20 [ 44.913098] [] call_netdevice_notifiers_info+0x47/0x80 [ 44.919994] [] register_netdevice+0x8e8/0xd00 [ 44.926108] [] ? netdev_change_features+0x80/0x80 [ 44.932570] [] ? dev_get_nest_level+0x10c/0x1a0 [ 44.938899] [] macvlan_common_newlink+0x8b9/0x1090 [ 44.945493] [] macvtap_newlink+0xbf/0x110 [ 44.951268] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.957596] [] rtnl_newlink+0xd4b/0x1230 [ 44.963275] [] ? rtnl_link_ops_get+0x5d/0x90 [ 44.969336] [] ? rtnl_newlink+0x319/0x1230 [ 44.975326] [] ? find_next_bit+0x15/0x20 [ 44.981011] [] ? rtnl_setlink+0x2f0/0x2f0 [ 44.986784] [] ? cpuacct_css_alloc+0x160/0x160 [ 44.992991] [] ? update_blocked_averages+0x8f7/0x1540 [ 44.999801] [] ? find_busiest_group+0x2510/0x2510 [ 45.006264] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 45.013266] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.019555] [] rtnetlink_rcv_msg+0x222/0x680 [ 45.025585] [] ? rtnetlink_rcv+0x30/0x30 [ 45.031270] [] ? mutex_lock_nested+0x5fd/0xb30 [ 45.037479] [] ? rtnetlink_rcv+0x16/0x30 [ 45.043258] [] ? netlink_seq_start+0xe0/0xe0 [ 45.049288] [] netlink_rcv_skb+0x242/0x350 [ 45.055146] [] ? rtnetlink_rcv+0x30/0x30 [ 45.060842] [] rtnetlink_rcv+0x25/0x30 [ 45.066350] [] netlink_unicast+0x3da/0x560 [ 45.072204] [] ? netlink_sendskb+0x40/0x40 [ 45.078075] [] netlink_sendmsg+0x9bb/0xb40 [ 45.083931] [] ? nlmsg_notify+0xf0/0xf0 [ 45.089532] [] ? __might_fault+0xf1/0x1b0 [ 45.095301] [] ? security_socket_sendmsg+0x6a/0xa0 [ 45.101870] [] ? nlmsg_notify+0xf0/0xf0 [ 45.107470] [] sock_sendmsg+0xb5/0xf0 [ 45.112892] [] SyS_sendto+0x1ca/0x290 [ 45.118311] [] ? SyS_getpeername+0x240/0x240 [ 45.124338] [] ? kmem_cache_free+0x312/0x430 [ 45.130366] [] ? mntput_no_expire+0xce/0x600 [ 45.136393] [] ? mnt_get_count+0x1c0/0x1c0 [ 45.142250] [] ? mntput+0x52/0x70 [ 45.147324] [] ? task_work_run+0x14a/0x200 [ 45.153179] [] ? trace_hardirqs_off+0xd/0x10 [ 45.159210] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 45.165762] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 45.172316] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 45.180001] Kernel Offset: disabled