[ 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: [ 34.812193] IPVS: Creating netns size=2712 id=1 [ 34.818045] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts. 2020/08/29 02:46:37 parsed 1 programs 2020/08/29 02:46:37 executed programs: 0 [ 42.433294] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 42.453297] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 42.464723] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 42.486426] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 42.488060] IPVS: Creating netns size=2712 id=2 [ 42.488185] IPVS: ftp: loaded support on port[0] = 21 [ 42.505518] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 42.520021] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 42.590617] IPVS: Creating netns size=2712 id=3 [ 42.595444] IPVS: ftp: loaded support on port[0] = 21 [ 42.755667] chnl_net:caif_netlink_parms(): no params data found [ 42.773011] IPVS: Creating netns size=2712 id=4 [ 42.778165] IPVS: ftp: loaded support on port[0] = 21 [ 42.977171] chnl_net:caif_netlink_parms(): no params data found [ 43.016920] IPVS: Creating netns size=2712 id=5 [ 43.023348] IPVS: ftp: loaded support on port[0] = 21 [ 43.247418] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.255713] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.266017] device bridge_slave_0 entered promiscuous mode [ 43.293888] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.300390] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.310694] device bridge_slave_1 entered promiscuous mode [ 43.391093] IPVS: Creating netns size=2712 id=6 [ 43.395911] IPVS: ftp: loaded support on port[0] = 21 [ 43.420523] chnl_net:caif_netlink_parms(): no params data found [ 43.474092] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.480754] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.490486] device bridge_slave_0 entered promiscuous mode [ 43.499024] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.505384] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.515076] device bridge_slave_1 entered promiscuous mode [ 43.524497] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.596631] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.622403] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.749415] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.914393] chnl_net:caif_netlink_parms(): no params data found [ 43.995176] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 44.016578] IPVS: Creating netns size=2712 id=7 [ 44.023991] IPVS: ftp: loaded support on port[0] = 21 [ 44.049126] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 44.112977] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.157327] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.186648] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.193324] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.202399] device bridge_slave_0 entered promiscuous mode [ 44.234462] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.264311] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.271391] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.281040] device bridge_slave_1 entered promiscuous mode [ 44.315499] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.371824] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.446324] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.482541] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.490740] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.537626] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.663384] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.757072] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.764370] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.773751] device bridge_slave_0 entered promiscuous mode [ 44.820541] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.826952] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.836811] device bridge_slave_1 entered promiscuous mode [ 45.000922] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.008846] chnl_net:caif_netlink_parms(): no params data found [ 45.052343] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.061059] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.192701] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.280222] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.288349] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.471235] chnl_net:caif_netlink_parms(): no params data found [ 45.689910] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.764931] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 45.773148] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.796932] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 45.804375] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.811287] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.822254] device bridge_slave_0 entered promiscuous mode [ 45.894539] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.901244] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.910857] device bridge_slave_1 entered promiscuous mode [ 45.970020] ------------[ cut here ]------------ [ 45.974776] WARNING: CPU: 0 PID: 5899 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 45.983465] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 45.990889] Kernel panic - not syncing: panic_on_warn set ... [ 45.990889] [ 45.998227] CPU: 0 PID: 5899 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0 [ 46.005729] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.015093] 0000000000000000 ffff88012a886fc8 ffffffff82c65e52 ffffffff85c81040 [ 46.023351] ffff88012a8870a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 46.031628] ffff88012a887090 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a [ 46.039616] Call Trace: [ 46.042177] [] dump_stack+0x136/0x1d4 [ 46.047601] [] ? sysfs_warn_dup+0x7b/0xa0 [ 46.053412] [] panic+0x1af/0x348 [ 46.058501] [] ? to_vmem_altmap+0x125/0x125 [ 46.064441] [] ? sysfs_warn_dup+0x7b/0xa0 [ 46.070208] [] __warn+0x18d/0x1b0 [ 46.075294] [] warn_slowpath_fmt+0x92/0xb0 [ 46.081168] [] ? __warn+0x1b0/0x1b0 [ 46.086410] [] ? kernfs_path_from_node+0x4a/0x60 [ 46.092780] [] sysfs_warn_dup+0x7b/0xa0 [ 46.098391] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 46.105371] [] sysfs_create_link+0x43/0xb0 [ 46.111226] [] device_add+0x677/0x1350 [ 46.116734] [] ? device_private_init+0x180/0x180 [ 46.123107] [] ? kfree_const+0x1d/0x20 [ 46.128614] [] ? kobject_set_name_vargs+0xb4/0x130 [ 46.135162] [] device_create_groups_vargs+0x1c8/0x220 [ 46.141970] [] device_create+0x88/0xa0 [ 46.147475] [] ? device_create_vargs+0x20/0x20 [ 46.153689] [] ? macvlan_set_mac_address+0x150/0x150 [ 46.160407] [] macvtap_device_event+0x1c4/0x2a0 [ 46.166693] [] notifier_call_chain+0x8b/0x170 [ 46.172806] [] raw_notifier_call_chain+0x11/0x20 [ 46.179195] [] call_netdevice_notifiers_info+0x47/0x80 [ 46.186090] [] register_netdevice+0x8e8/0xd00 [ 46.192217] [] ? netdev_change_features+0x80/0x80 [ 46.198675] [] ? dev_get_nest_level+0x10c/0x1a0 [ 46.204960] [] macvlan_common_newlink+0x8b9/0x1090 [ 46.211507] [] macvtap_newlink+0xbf/0x110 [ 46.217295] [] ? __netlink_ns_capable+0xc7/0xf0 [ 46.223697] [] rtnl_newlink+0xd4b/0x1230 [ 46.229376] [] ? rtnl_link_ops_get+0x5d/0x90 [ 46.235401] [] ? rtnl_newlink+0x319/0x1230 [ 46.241253] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 46.247974] [] ? rtnl_setlink+0x2f0/0x2f0 [ 46.253738] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 46.260466] [] ? __lock_acquire+0x15c3/0x5990 [ 46.266580] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 46.273564] [] ? __netlink_ns_capable+0xc7/0xf0 [ 46.279868] [] rtnetlink_rcv_msg+0x222/0x680 [ 46.285894] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 46.292717] [] ? rtnetlink_rcv+0x30/0x30 [ 46.298414] [] ? mutex_lock_nested+0x5fd/0xb30 [ 46.304612] [] ? rtnetlink_rcv+0x16/0x30 [ 46.310915] [] ? netlink_seq_start+0xe0/0xe0 [ 46.316939] [] netlink_rcv_skb+0x242/0x350 [ 46.322789] [] ? rtnetlink_rcv+0x30/0x30 [ 46.328570] [] rtnetlink_rcv+0x25/0x30 [ 46.334087] [] netlink_unicast+0x3da/0x560 [ 46.339955] [] ? netlink_sendskb+0x40/0x40 [ 46.345819] [] netlink_sendmsg+0x9bb/0xb40 [ 46.351669] [] ? nlmsg_notify+0xf0/0xf0 [ 46.357262] [] ? __might_fault+0xf1/0x1b0 [ 46.363027] [] ? nlmsg_notify+0xf0/0xf0 [ 46.368619] [] sock_sendmsg+0xb5/0xf0 [ 46.374037] [] SyS_sendto+0x1ca/0x290 [ 46.379455] [] ? SyS_getpeername+0x240/0x240 [ 46.385481] [] ? mntput_no_expire+0xce/0x600 [ 46.391519] [] ? mnt_get_count+0x1c0/0x1c0 [ 46.397371] [] ? mntput+0x52/0x70 [ 46.402442] [] ? task_work_run+0x14a/0x200 [ 46.408295] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 46.415102] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 46.421650] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 46.429476] Kernel Offset: disabled