[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 35.545398] IPVS: Creating netns size=2712 id=1 [ 35.550294] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.201' (ECDSA) to the list of known hosts. 2020/06/10 14:49:31 parsed 1 programs 2020/06/10 14:49:31 executed programs: 0 [ 43.960423] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 43.972867] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 43.983545] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 43.992549] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 44.001572] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 44.009674] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 44.029221] IPVS: Creating netns size=2712 id=2 [ 44.034193] IPVS: ftp: loaded support on port[0] = 21 [ 44.112403] IPVS: Creating netns size=2712 id=3 [ 44.118579] IPVS: ftp: loaded support on port[0] = 21 [ 44.274412] chnl_net:caif_netlink_parms(): no params data found [ 44.321582] IPVS: Creating netns size=2712 id=4 [ 44.326856] IPVS: ftp: loaded support on port[0] = 21 [ 44.527937] IPVS: Creating netns size=2712 id=5 [ 44.542776] IPVS: ftp: loaded support on port[0] = 21 [ 44.563777] chnl_net:caif_netlink_parms(): no params data found [ 44.692125] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.699388] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.709552] device bridge_slave_0 entered promiscuous mode [ 44.730344] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.736989] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.747156] device bridge_slave_1 entered promiscuous mode [ 44.904410] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.930062] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.933649] IPVS: Creating netns size=2712 id=6 [ 44.933773] IPVS: ftp: loaded support on port[0] = 21 [ 45.034205] chnl_net:caif_netlink_parms(): no params data found [ 45.152445] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.163511] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.173083] device bridge_slave_0 entered promiscuous mode [ 45.251744] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.258410] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.267869] device bridge_slave_1 entered promiscuous mode [ 45.391400] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.416431] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.428257] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.465023] IPVS: Creating netns size=2712 id=7 [ 45.465283] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.466253] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.467317] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.493735] IPVS: ftp: loaded support on port[0] = 21 [ 45.566215] chnl_net:caif_netlink_parms(): no params data found [ 45.681216] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.690657] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.947534] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.954654] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.963478] device bridge_slave_0 entered promiscuous mode [ 46.027791] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.034322] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.043115] device bridge_slave_1 entered promiscuous mode [ 46.071158] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.133031] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.140996] chnl_net:caif_netlink_parms(): no params data found [ 46.230828] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.302112] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.500588] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.507904] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.516300] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.525880] device bridge_slave_0 entered promiscuous mode [ 46.581883] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.613162] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.620227] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.633322] device bridge_slave_1 entered promiscuous mode [ 46.746169] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.811090] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.876995] chnl_net:caif_netlink_parms(): no params data found [ 46.925533] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 46.952419] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.988525] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.166858] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.173369] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.183714] device bridge_slave_0 entered promiscuous mode [ 47.246785] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.254888] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.264823] device bridge_slave_1 entered promiscuous mode [ 47.278682] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.319072] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.327104] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.336204] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.437321] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.506393] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.661228] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.669772] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.677943] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.686013] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.695939] device bridge_slave_0 entered promiscuous mode [ 47.704288] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.710748] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.720247] device bridge_slave_1 entered promiscuous mode [ 47.896386] 8021q: adding VLAN 0 to HW filter on device bond0 [ 47.905553] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.958576] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.053624] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.082423] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 48.092241] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 48.112685] ------------[ cut here ]------------ [ 48.118151] WARNING: CPU: 0 PID: 5867 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 48.127502] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 48.134545] Kernel panic - not syncing: panic_on_warn set ... [ 48.134545] [ 48.141935] CPU: 0 PID: 5867 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0 [ 48.150524] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.159853] 0000000000000000 ffff8800b3b86fc8 ffffffff82c65e52 ffffffff85c81040 [ 48.169763] ffff8800b3b870a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 48.177841] ffff8800b3b87090 ffffffff8160d884 0000000041b58ab3 ffffffff868f05e2 [ 48.185871] Call Trace: [ 48.188436] [] dump_stack+0x136/0x1d4 [ 48.194053] [] ? sysfs_warn_dup+0x7b/0xa0 [ 48.199931] [] panic+0x1af/0x348 [ 48.204920] [] ? to_vmem_altmap+0x125/0x125 [ 48.210861] [] ? sysfs_warn_dup+0x7b/0xa0 [ 48.216643] [] __warn+0x18d/0x1b0 [ 48.221718] [] warn_slowpath_fmt+0x92/0xb0 [ 48.227574] [] ? __warn+0x1b0/0x1b0 [ 48.232962] [] ? kernfs_path_from_node+0x4a/0x60 [ 48.239347] [] sysfs_warn_dup+0x7b/0xa0 [ 48.244956] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 48.252031] [] sysfs_create_link+0x43/0xb0 [ 48.257902] [] device_add+0x677/0x1350 [ 48.263414] [] ? device_private_init+0x180/0x180 [ 48.269814] [] ? kfree_const+0x1d/0x20 [ 48.275332] [] ? kobject_set_name_vargs+0xb4/0x130 [ 48.281886] [] device_create_groups_vargs+0x1c8/0x220 [ 48.290961] [] device_create+0x88/0xa0 [ 48.296472] [] ? device_create_vargs+0x20/0x20 [ 48.302676] [] ? macvlan_set_mac_address+0x150/0x150 [ 48.309416] [] macvtap_device_event+0x1c4/0x2a0 [ 48.315708] [] notifier_call_chain+0x8b/0x170 [ 48.321824] [] raw_notifier_call_chain+0x11/0x20 [ 48.328201] [] call_netdevice_notifiers_info+0x47/0x80 [ 48.335103] [] register_netdevice+0x8e8/0xd00 [ 48.341235] [] ? netdev_change_features+0x80/0x80 [ 48.348062] [] ? dev_get_nest_level+0x10c/0x1a0 [ 48.354383] [] macvlan_common_newlink+0x8b9/0x1090 [ 48.361022] [] macvtap_newlink+0xbf/0x110 [ 48.366792] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.373101] [] rtnl_newlink+0xd4b/0x1230 [ 48.378784] [] ? rtnl_link_ops_get+0x5d/0x90 [ 48.384839] [] ? rtnl_newlink+0x319/0x1230 [ 48.390794] [] ? load_balance+0xc07/0x1ef0 [ 48.396647] [] ? rtnl_setlink+0x2f0/0x2f0 [ 48.402437] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 48.409268] [] ? __lock_acquire+0x15c3/0x5990 [ 48.415390] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 48.422439] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.428742] [] rtnetlink_rcv_msg+0x222/0x680 [ 48.434779] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 48.441598] [] ? rtnetlink_rcv+0x30/0x30 [ 48.447386] [] ? mutex_lock_nested+0x5fd/0xb30 [ 48.453608] [] ? rtnetlink_rcv+0x16/0x30 [ 48.459320] [] ? netlink_seq_start+0xe0/0xe0 [ 48.465440] [] netlink_rcv_skb+0x242/0x350 [ 48.471317] [] ? rtnetlink_rcv+0x30/0x30 [ 48.477188] [] rtnetlink_rcv+0x25/0x30 [ 48.482808] [] netlink_unicast+0x3da/0x560 [ 48.488683] [] ? netlink_sendskb+0x40/0x40 [ 48.494540] [] netlink_sendmsg+0x9bb/0xb40 [ 48.500402] [] ? nlmsg_notify+0xf0/0xf0 [ 48.506096] [] ? __might_fault+0xf1/0x1b0 [ 48.511897] [] ? nlmsg_notify+0xf0/0xf0 [ 48.517881] [] sock_sendmsg+0xb5/0xf0 [ 48.524543] [] SyS_sendto+0x1ca/0x290 [ 48.529995] [] ? SyS_getpeername+0x240/0x240 [ 48.536033] [] ? mntput_no_expire+0xce/0x600 [ 48.542147] [] ? mnt_get_count+0x1c0/0x1c0 [ 48.548000] [] ? mntput+0x52/0x70 [ 48.553094] [] ? task_work_run+0x14a/0x200 [ 48.558958] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 48.565767] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 48.572414] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 48.580545] Kernel Offset: disabled