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: [ 35.158715] IPVS: Creating netns size=2712 id=1 [ 35.163488] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. 2020/07/24 22:29:46 parsed 1 programs 2020/07/24 22:29:46 executed programs: 0 [ 43.407814] IPVS: Creating netns size=2712 id=2 [ 43.420090] IPVS: ftp: loaded support on port[0] = 21 [ 43.523698] IPVS: Creating netns size=2712 id=3 [ 43.530020] IPVS: ftp: loaded support on port[0] = 21 [ 43.697855] IPVS: Creating netns size=2712 id=4 [ 43.703036] IPVS: ftp: loaded support on port[0] = 21 [ 43.709616] chnl_net:caif_netlink_parms(): no params data found [ 43.933209] chnl_net:caif_netlink_parms(): no params data found [ 43.975679] IPVS: Creating netns size=2712 id=5 [ 43.980820] IPVS: ftp: loaded support on port[0] = 21 [ 44.138684] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.145221] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.155400] device bridge_slave_0 entered promiscuous mode [ 44.238352] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.244735] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.254258] device bridge_slave_1 entered promiscuous mode [ 44.349988] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.365174] chnl_net:caif_netlink_parms(): no params data found [ 44.384421] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.409682] IPVS: Creating netns size=2712 id=6 [ 44.414577] IPVS: ftp: loaded support on port[0] = 21 [ 44.548792] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.555303] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.566476] device bridge_slave_0 entered promiscuous mode [ 44.603079] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.609579] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.619722] device bridge_slave_1 entered promiscuous mode [ 44.767641] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.777053] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 44.799614] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.809669] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 44.815960] IPVS: Creating netns size=2712 id=7 [ 44.816089] IPVS: ftp: loaded support on port[0] = 21 [ 44.947081] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.004509] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.223071] chnl_net:caif_netlink_parms(): no params data found [ 45.306428] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.314495] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.323113] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.333887] device bridge_slave_0 entered promiscuous mode [ 45.349925] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.357548] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.364967] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.394907] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.401942] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.411691] device bridge_slave_1 entered promiscuous mode [ 45.559691] chnl_net:caif_netlink_parms(): no params data found [ 45.579451] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.648698] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.658615] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.719306] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.064005] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.071198] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.080787] device bridge_slave_0 entered promiscuous mode [ 46.143730] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.150778] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.160429] device bridge_slave_1 entered promiscuous mode [ 46.223887] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.300656] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.353585] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.391414] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.580323] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.587656] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.598379] device bridge_slave_0 entered promiscuous mode [ 46.609820] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 46.618997] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.626485] chnl_net:caif_netlink_parms(): no params data found [ 46.644022] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.651220] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.661000] device bridge_slave_1 entered promiscuous mode [ 46.690005] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.810329] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.819267] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.859787] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.868938] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.902849] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 47.088385] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.131357] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.241751] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.248749] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.259276] device bridge_slave_0 entered promiscuous mode [ 47.285256] ------------[ cut here ]------------ [ 47.290025] WARNING: CPU: 1 PID: 5892 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 47.298856] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 47.305925] Kernel panic - not syncing: panic_on_warn set ... [ 47.305925] [ 47.313635] CPU: 1 PID: 5892 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 47.321153] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.330499] 0000000000000000 ffff8800b39e6fc8 ffffffff82c65e52 ffffffff85c81040 [ 47.338620] ffff8800b39e70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 47.346602] ffff8800b39e7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3402 [ 47.354589] Call Trace: [ 47.357242] [] dump_stack+0x136/0x1d4 [ 47.362668] [] ? sysfs_warn_dup+0x7b/0xa0 [ 47.368436] [] panic+0x1af/0x348 [ 47.373434] [] ? to_vmem_altmap+0x125/0x125 [ 47.379471] [] ? sysfs_warn_dup+0x7b/0xa0 [ 47.385323] [] __warn+0x18d/0x1b0 [ 47.390405] [] warn_slowpath_fmt+0x92/0xb0 [ 47.396403] [] ? __warn+0x1b0/0x1b0 [ 47.401663] [] ? kernfs_path_from_node+0x4a/0x60 [ 47.408069] [] sysfs_warn_dup+0x7b/0xa0 [ 47.413678] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 47.420658] [] sysfs_create_link+0x43/0xb0 [ 47.426605] [] device_add+0x677/0x1350 [ 47.432125] [] ? device_private_init+0x180/0x180 [ 47.438592] [] ? kfree_const+0x1d/0x20 [ 47.444108] [] ? kobject_set_name_vargs+0xb4/0x130 [ 47.450762] [] device_create_groups_vargs+0x1c8/0x220 [ 47.457676] [] device_create+0x88/0xa0 [ 47.463190] [] ? device_create_vargs+0x20/0x20 [ 47.469412] [] ? macvlan_set_mac_address+0x150/0x150 [ 47.476151] [] macvtap_device_event+0x1c4/0x2a0 [ 47.482446] [] notifier_call_chain+0x8b/0x170 [ 47.488559] [] raw_notifier_call_chain+0x11/0x20 [ 47.495101] [] call_netdevice_notifiers_info+0x47/0x80 [ 47.501997] [] register_netdevice+0x8e8/0xd00 [ 47.508111] [] ? netdev_change_features+0x80/0x80 [ 47.514573] [] ? dev_get_nest_level+0x10c/0x1a0 [ 47.520909] [] macvlan_common_newlink+0x8b9/0x1090 [ 47.527603] [] macvtap_newlink+0xbf/0x110 [ 47.533510] [] ? __netlink_ns_capable+0xc7/0xf0 [ 47.539808] [] rtnl_newlink+0xd4b/0x1230 [ 47.545494] [] ? rtnl_link_ops_get+0x5d/0x90 [ 47.551524] [] ? rtnl_newlink+0x319/0x1230 [ 47.557382] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 47.564368] [] ? rtnl_setlink+0x2f0/0x2f0 [ 47.570176] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 47.576906] [] ? __lock_acquire+0x15c3/0x5990 [ 47.583022] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 47.590025] [] ? __netlink_ns_capable+0xc7/0xf0 [ 47.596406] [] rtnetlink_rcv_msg+0x222/0x680 [ 47.602519] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 47.609348] [] ? rtnetlink_rcv+0x30/0x30 [ 47.615313] [] ? mutex_lock_nested+0x5fd/0xb30 [ 47.621545] [] ? rtnetlink_rcv+0x16/0x30 [ 47.627250] [] ? netlink_seq_start+0xe0/0xe0 [ 47.633300] [] netlink_rcv_skb+0x242/0x350 [ 47.639851] [] ? rtnetlink_rcv+0x30/0x30 [ 47.645898] [] rtnetlink_rcv+0x25/0x30 [ 47.651431] [] netlink_unicast+0x3da/0x560 [ 47.657288] [] ? netlink_sendskb+0x40/0x40 [ 47.663146] [] netlink_sendmsg+0x9bb/0xb40 [ 47.669006] [] ? nlmsg_notify+0xf0/0xf0 [ 47.674801] [] ? __might_fault+0xf1/0x1b0 [ 47.680660] [] ? nlmsg_notify+0xf0/0xf0 [ 47.686278] [] sock_sendmsg+0xb5/0xf0 [ 47.691988] [] SyS_sendto+0x1ca/0x290 [ 47.698121] [] ? SyS_getpeername+0x240/0x240 [ 47.704160] [] ? mntput_no_expire+0xce/0x600 [ 47.710691] [] ? mnt_get_count+0x1c0/0x1c0 [ 47.716814] [] ? mntput+0x52/0x70 [ 47.723893] [] ? task_work_run+0x14a/0x200 [ 47.730997] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 47.738289] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 47.746210] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 47.754541] Kernel Offset: disabled