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: [ 32.317492] IPVS: Creating netns size=2712 id=1 [ 32.322268] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.128' (ECDSA) to the list of known hosts. 2020/08/10 00:02:03 parsed 1 programs 2020/08/10 00:02:03 executed programs: 0 [ 40.182987] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 40.191058] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 40.199025] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 40.208250] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 40.220492] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 40.228725] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 40.245585] IPVS: Creating netns size=2712 id=2 [ 40.250468] IPVS: ftp: loaded support on port[0] = 21 [ 40.328776] IPVS: Creating netns size=2712 id=3 [ 40.333865] IPVS: ftp: loaded support on port[0] = 21 [ 40.501468] chnl_net:caif_netlink_parms(): no params data found [ 40.516118] IPVS: Creating netns size=2712 id=4 [ 40.520949] IPVS: ftp: loaded support on port[0] = 21 [ 40.746321] chnl_net:caif_netlink_parms(): no params data found [ 40.785289] IPVS: Creating netns size=2712 id=5 [ 40.792096] IPVS: ftp: loaded support on port[0] = 21 [ 40.874337] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.881354] bridge0: port 1(bridge_slave_0) entered disabled state [ 40.891752] device bridge_slave_0 entered promiscuous mode [ 40.922067] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.928712] bridge0: port 2(bridge_slave_1) entered disabled state [ 40.938410] device bridge_slave_1 entered promiscuous mode [ 41.033298] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.049330] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.236052] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.242489] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.253264] device bridge_slave_0 entered promiscuous mode [ 41.274923] IPVS: Creating netns size=2712 id=6 [ 41.280304] IPVS: ftp: loaded support on port[0] = 21 [ 41.298028] chnl_net:caif_netlink_parms(): no params data found [ 41.313317] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.320265] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.329923] device bridge_slave_1 entered promiscuous mode [ 41.467616] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.478676] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.508305] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.517141] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 41.528106] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.567219] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 41.851554] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 41.860077] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 41.890264] chnl_net:caif_netlink_parms(): no params data found [ 41.901738] IPVS: Creating netns size=2712 id=7 [ 41.922621] IPVS: ftp: loaded support on port[0] = 21 [ 41.954189] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.004623] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.054331] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.061355] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.070861] device bridge_slave_0 entered promiscuous mode [ 42.181691] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.188221] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.198570] device bridge_slave_1 entered promiscuous mode [ 42.347376] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.357510] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 42.364571] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 42.405739] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.568351] chnl_net:caif_netlink_parms(): no params data found [ 42.721615] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.728697] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.738259] device bridge_slave_0 entered promiscuous mode [ 42.811450] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.818666] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.828723] device bridge_slave_1 entered promiscuous mode [ 42.977548] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.999807] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.080418] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.114591] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.272076] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 43.326001] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.345558] chnl_net:caif_netlink_parms(): no params data found [ 43.386179] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.433939] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.440396] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.449772] device bridge_slave_0 entered promiscuous mode [ 43.509413] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.516879] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.528514] device bridge_slave_1 entered promiscuous mode [ 43.651093] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.682325] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.713924] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.731981] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.829186] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 43.919358] 8021q: adding VLAN 0 to HW filter on device bond0 [ 43.985178] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 44.013423] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.034520] ------------[ cut here ]------------ [ 44.039289] WARNING: CPU: 1 PID: 5880 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 44.047456] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 44.054516] Kernel panic - not syncing: panic_on_warn set ... [ 44.054516] [ 44.061861] CPU: 1 PID: 5880 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0 [ 44.069416] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.078746] 0000000000000000 ffff8800b25a6fc8 ffffffff82c65e52 ffffffff85c81040 [ 44.086725] ffff8800b25a70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 44.094709] ffff8800b25a7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a [ 44.102695] Call Trace: [ 44.105255] [] dump_stack+0x136/0x1d4 [ 44.110678] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.116445] [] panic+0x1af/0x348 [ 44.121428] [] ? to_vmem_altmap+0x125/0x125 [ 44.127369] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.133156] [] __warn+0x18d/0x1b0 [ 44.138230] [] warn_slowpath_fmt+0x92/0xb0 [ 44.144087] [] ? __warn+0x1b0/0x1b0 [ 44.149359] [] ? kernfs_path_from_node+0x4a/0x60 [ 44.155748] [] sysfs_warn_dup+0x7b/0xa0 [ 44.161341] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 44.168326] [] sysfs_create_link+0x43/0xb0 [ 44.175137] [] device_add+0x677/0x1350 [ 44.180658] [] ? device_private_init+0x180/0x180 [ 44.187035] [] ? kfree_const+0x1d/0x20 [ 44.192556] [] ? kobject_set_name_vargs+0xb4/0x130 [ 44.199107] [] device_create_groups_vargs+0x1c8/0x220 [ 44.205940] [] device_create+0x88/0xa0 [ 44.211452] [] ? device_create_vargs+0x20/0x20 [ 44.217668] [] ? macvlan_set_mac_address+0x150/0x150 [ 44.224405] [] macvtap_device_event+0x1c4/0x2a0 [ 44.230702] [] notifier_call_chain+0x8b/0x170 [ 44.236816] [] raw_notifier_call_chain+0x11/0x20 [ 44.243207] [] call_netdevice_notifiers_info+0x47/0x80 [ 44.250105] [] register_netdevice+0x8e8/0xd00 [ 44.256223] [] ? netdev_change_features+0x80/0x80 [ 44.262682] [] ? dev_get_nest_level+0x10c/0x1a0 [ 44.268973] [] macvlan_common_newlink+0x8b9/0x1090 [ 44.275525] [] macvtap_newlink+0xbf/0x110 [ 44.281292] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.287581] [] rtnl_newlink+0xd4b/0x1230 [ 44.293262] [] ? rtnl_link_ops_get+0x5d/0x90 [ 44.299289] [] ? rtnl_newlink+0x319/0x1230 [ 44.305147] [] ? load_balance+0x967/0x1ef0 [ 44.310998] [] ? rtnl_setlink+0x2f0/0x2f0 [ 44.316784] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 44.323528] [] ? __lock_acquire+0x15c3/0x5990 [ 44.329643] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 44.336627] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.342913] [] rtnetlink_rcv_msg+0x222/0x680 [ 44.348944] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 44.355830] [] ? rtnetlink_rcv+0x30/0x30 [ 44.361527] [] ? mutex_lock_nested+0x5fd/0xb30 [ 44.367736] [] ? rtnetlink_rcv+0x16/0x30 [ 44.373418] [] ? netlink_seq_start+0xe0/0xe0 [ 44.379447] [] netlink_rcv_skb+0x242/0x350 [ 44.385302] [] ? rtnetlink_rcv+0x30/0x30 [ 44.390979] [] rtnetlink_rcv+0x25/0x30 [ 44.396494] [] netlink_unicast+0x3da/0x560 [ 44.402346] [] ? netlink_sendskb+0x40/0x40 [ 44.408202] [] netlink_sendmsg+0x9bb/0xb40 [ 44.414060] [] ? nlmsg_notify+0xf0/0xf0 [ 44.419659] [] ? __might_fault+0xf1/0x1b0 [ 44.425443] [] ? nlmsg_notify+0xf0/0xf0 [ 44.431063] [] sock_sendmsg+0xb5/0xf0 [ 44.436495] [] SyS_sendto+0x1ca/0x290 [ 44.441917] [] ? SyS_getpeername+0x240/0x240 [ 44.447948] [] ? mntput_no_expire+0xce/0x600 [ 44.453981] [] ? mnt_get_count+0x1c0/0x1c0 [ 44.459843] [] ? mntput+0x52/0x70 [ 44.464918] [] ? task_work_run+0x14a/0x200 [ 44.470770] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 44.477579] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 44.484132] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 44.492071] Kernel Offset: disabled