[ 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: [ 33.474977] IPVS: Creating netns size=2712 id=1 [ 33.480158] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.94' (ECDSA) to the list of known hosts. 2020/09/08 05:17:40 parsed 1 programs 2020/09/08 05:17:40 executed programs: 0 [ 41.276307] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 41.288091] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 41.301785] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 41.310794] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 41.318481] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 41.332705] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 41.342443] IPVS: Creating netns size=2712 id=2 [ 41.347173] IPVS: ftp: loaded support on port[0] = 21 [ 41.416513] IPVS: Creating netns size=2712 id=3 [ 41.421415] IPVS: ftp: loaded support on port[0] = 21 [ 41.568577] IPVS: Creating netns size=2712 id=4 [ 41.574134] IPVS: ftp: loaded support on port[0] = 21 [ 41.592075] chnl_net:caif_netlink_parms(): no params data found [ 41.794927] chnl_net:caif_netlink_parms(): no params data found [ 41.805422] IPVS: Creating netns size=2712 id=5 [ 41.810513] IPVS: ftp: loaded support on port[0] = 21 [ 41.994664] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.001884] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.011433] device bridge_slave_0 entered promiscuous mode [ 42.047505] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.054253] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.063802] device bridge_slave_1 entered promiscuous mode [ 42.104463] chnl_net:caif_netlink_parms(): no params data found [ 42.147423] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.174264] IPVS: Creating netns size=2712 id=6 [ 42.178994] IPVS: ftp: loaded support on port[0] = 21 [ 42.199720] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.426215] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.433320] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.443798] device bridge_slave_0 entered promiscuous mode [ 42.452234] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.458619] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.467989] device bridge_slave_1 entered promiscuous mode [ 42.534995] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.583946] IPVS: Creating netns size=2712 id=7 [ 42.584398] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.597328] IPVS: ftp: loaded support on port[0] = 21 [ 42.676090] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 42.683871] chnl_net:caif_netlink_parms(): no params data found [ 42.762603] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 42.770905] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.800834] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.807239] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.817018] device bridge_slave_0 entered promiscuous mode [ 42.844488] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.895405] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.901822] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.911202] device bridge_slave_1 entered promiscuous mode [ 43.115916] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.124559] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.132585] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.161478] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.269078] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.281742] chnl_net:caif_netlink_parms(): no params data found [ 43.334502] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.545776] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.552548] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.562805] device bridge_slave_0 entered promiscuous mode [ 43.579971] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.640708] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.647086] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.656871] device bridge_slave_1 entered promiscuous mode [ 43.673559] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.681410] chnl_net:caif_netlink_parms(): no params data found [ 43.762207] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.794159] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.822659] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.887598] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.011432] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.061908] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.242395] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.249820] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.258521] device bridge_slave_0 entered promiscuous mode [ 44.297519] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.304628] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.311920] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.321894] device bridge_slave_1 entered promiscuous mode [ 44.358311] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.430630] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.470102] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.519326] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.525728] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.535291] device bridge_slave_0 entered promiscuous mode [ 44.544707] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.584077] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.590853] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.600519] device bridge_slave_1 entered promiscuous mode [ 44.693541] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.712098] ------------[ cut here ]------------ [ 44.716850] WARNING: CPU: 0 PID: 5902 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 44.725511] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 44.732543] Kernel panic - not syncing: panic_on_warn set ... [ 44.732543] [ 44.739891] CPU: 0 PID: 5902 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 44.747424] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.756759] 0000000000000000 ffff8800b2ae6eb0 ffffffff82c65e52 ffffffff85c81040 [ 44.764751] ffff8800b2ae6f88 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 44.772723] ffff8800b2ae6f78 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a [ 44.780722] Call Trace: [ 44.783280] [] dump_stack+0x136/0x1d4 [ 44.788706] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.794479] [] panic+0x1af/0x348 [ 44.799476] [] ? to_vmem_altmap+0x125/0x125 [ 44.805417] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.811183] [] __warn+0x18d/0x1b0 [ 44.816257] [] warn_slowpath_fmt+0x92/0xb0 [ 44.822112] [] ? __warn+0x1b0/0x1b0 [ 44.827357] [] ? kernfs_path_from_node+0x4a/0x60 [ 44.833741] [] sysfs_warn_dup+0x7b/0xa0 [ 44.839342] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 44.846333] [] sysfs_create_link+0x43/0xb0 [ 44.852200] [] device_add+0x677/0x1350 [ 44.857705] [] ? device_private_init+0x180/0x180 [ 44.864081] [] ? kfree_const+0x1d/0x20 [ 44.869588] [] ? kobject_set_name_vargs+0xb4/0x130 [ 44.876135] [] device_create_groups_vargs+0x1c8/0x220 [ 44.882943] [] device_create+0x88/0xa0 [ 44.888453] [] ? device_create_vargs+0x20/0x20 [ 44.894670] [] ? macvlan_set_mac_address+0x150/0x150 [ 44.901391] [] macvtap_device_event+0x1c4/0x2a0 [ 44.907679] [] notifier_call_chain+0x8b/0x170 [ 44.913802] [] raw_notifier_call_chain+0x11/0x20 [ 44.920188] [] call_netdevice_notifiers_info+0x47/0x80 [ 44.927082] [] register_netdevice+0x8e8/0xd00 [ 44.933202] [] ? netdev_change_features+0x80/0x80 [ 44.939664] [] ? dev_get_nest_level+0x10c/0x1a0 [ 44.945952] [] macvlan_common_newlink+0x8b9/0x1090 [ 44.952509] [] macvtap_newlink+0xbf/0x110 [ 44.958279] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.964568] [] rtnl_newlink+0xd4b/0x1230 [ 44.970247] [] ? rtnl_link_ops_get+0x5d/0x90 [ 44.976272] [] ? rtnl_newlink+0x319/0x1230 [ 44.982132] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 44.988859] [] ? rtnl_setlink+0x2f0/0x2f0 [ 44.994643] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 45.001378] [] ? __lock_acquire+0x1673/0x5990 [ 45.007501] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 45.014483] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.020785] [] rtnetlink_rcv_msg+0x222/0x680 [ 45.026821] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 45.033646] [] ? rtnetlink_rcv+0x30/0x30 [ 45.039342] [] ? mutex_lock_nested+0x5fd/0xb30 [ 45.045579] [] ? rtnetlink_rcv+0x16/0x30 [ 45.051267] [] ? netlink_seq_start+0xe0/0xe0 [ 45.057293] [] netlink_rcv_skb+0x242/0x350 [ 45.063149] [] ? rtnetlink_rcv+0x30/0x30 [ 45.068840] [] rtnetlink_rcv+0x25/0x30 [ 45.074364] [] netlink_unicast+0x3da/0x560 [ 45.080219] [] ? netlink_sendskb+0x40/0x40 [ 45.086072] [] netlink_sendmsg+0x9bb/0xb40 [ 45.091927] [] ? nlmsg_notify+0xf0/0xf0 [ 45.097522] [] ? __might_fault+0xf1/0x1b0 [ 45.103298] [] ? nlmsg_notify+0xf0/0xf0 [ 45.108897] [] sock_sendmsg+0xb5/0xf0 [ 45.114334] [] SyS_sendto+0x1ca/0x290 [ 45.119766] [] ? SyS_getpeername+0x240/0x240 [ 45.125802] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 45.132786] [] ? mnt_get_count+0x1c0/0x1c0 [ 45.138648] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 45.145389] [] ? __might_fault+0xc6/0x1b0 [ 45.151158] [] ? __might_fault+0xf1/0x1b0 [ 45.156925] [] compat_SyS_socketcall+0x1ea/0x2d0 [ 45.163297] [] ? compat_SyS_recvmmsg+0x120/0x120 [ 45.169675] [] ? do_fast_syscall_32+0xd2/0xa70 [ 45.175874] [] do_fast_syscall_32+0x324/0xa70 [ 45.181989] [] ? trace_hardirqs_off_thunk+0x1b/0x1d [ 45.188648] [] entry_SYSENTER_compat+0x54/0x63 [ 45.195890] Kernel Offset: disabled