Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 33.929189] IPVS: Creating netns size=2712 id=1 [ 33.934191] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.85' (ECDSA) to the list of known hosts. 2020/04/22 18:11:33 parsed 1 programs 2020/04/22 18:11:33 executed programs: 0 [ 41.963517] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 41.981302] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 41.989649] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 41.998491] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 42.013235] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 42.021727] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 42.030660] IPVS: Creating netns size=2712 id=2 [ 42.035419] IPVS: ftp: loaded support on port[0] = 21 [ 42.108678] IPVS: Creating netns size=2712 id=3 [ 42.113585] IPVS: ftp: loaded support on port[0] = 21 [ 42.250937] chnl_net:caif_netlink_parms(): no params data found [ 42.288949] IPVS: Creating netns size=2712 id=4 [ 42.295692] IPVS: ftp: loaded support on port[0] = 21 [ 42.456496] chnl_net:caif_netlink_parms(): no params data found [ 42.526928] IPVS: Creating netns size=2712 id=5 [ 42.533374] IPVS: ftp: loaded support on port[0] = 21 [ 42.628842] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.635878] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.645421] device bridge_slave_0 entered promiscuous mode [ 42.681470] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.687898] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.697072] device bridge_slave_1 entered promiscuous mode [ 42.807019] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.846506] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.928051] IPVS: Creating netns size=2712 id=6 [ 42.929045] chnl_net:caif_netlink_parms(): no params data found [ 42.941299] IPVS: ftp: loaded support on port[0] = 21 [ 42.946883] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.947418] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.952568] device bridge_slave_0 entered promiscuous mode [ 43.023681] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.030867] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.040310] device bridge_slave_1 entered promiscuous mode [ 43.261639] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.277012] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.287729] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.307748] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.376092] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.418740] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.434136] chnl_net:caif_netlink_parms(): no params data found [ 43.462990] IPVS: Creating netns size=2712 id=7 [ 43.468128] IPVS: ftp: loaded support on port[0] = 21 [ 43.558498] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.565503] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.574915] device bridge_slave_0 entered promiscuous mode [ 43.642506] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.649109] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.658053] device bridge_slave_1 entered promiscuous mode [ 43.714914] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.729639] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.760238] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.768539] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.782058] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.835111] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.027764] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.081531] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.278540] chnl_net:caif_netlink_parms(): no params data found [ 44.326638] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.333153] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.342936] device bridge_slave_0 entered promiscuous mode [ 44.386632] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.394161] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.403540] device bridge_slave_1 entered promiscuous mode [ 44.450723] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.495311] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.507568] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.537418] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.621409] chnl_net:caif_netlink_parms(): no params data found [ 44.881576] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.945117] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.050939] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.057456] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.067047] device bridge_slave_0 entered promiscuous mode [ 45.075040] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.105061] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.111625] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.120918] device bridge_slave_1 entered promiscuous mode [ 45.127696] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.151240] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 45.219984] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 45.334969] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.357752] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.365056] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.374180] device bridge_slave_0 entered promiscuous mode [ 45.384418] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.408943] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.415301] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.424629] device bridge_slave_1 entered promiscuous mode [ 45.432754] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.512687] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.553426] ------------[ cut here ]------------ [ 45.558306] WARNING: CPU: 0 PID: 5878 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 45.566072] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 45.573235] Kernel panic - not syncing: panic_on_warn set ... [ 45.573235] [ 45.580698] CPU: 0 PID: 5878 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 [ 45.588290] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.597652] 0000000000000000 ffff8800b202efc8 ffffffff82c65932 ffffffff85c81040 [ 45.605687] ffff8800b202f0a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009 [ 45.614128] ffff8800b202f090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a [ 45.622389] Call Trace: [ 45.624978] [] dump_stack+0x136/0x1d4 [ 45.630415] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.636278] [] panic+0x1af/0x348 [ 45.641270] [] ? to_vmem_altmap+0x125/0x125 [ 45.647211] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.652992] [] __warn+0x18d/0x1b0 [ 45.658636] [] warn_slowpath_fmt+0x92/0xb0 [ 45.664801] [] ? __warn+0x1b0/0x1b0 [ 45.670257] [] ? kernfs_path_from_node+0x4a/0x60 [ 45.676836] [] sysfs_warn_dup+0x7b/0xa0 [ 45.682449] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 45.689477] [] sysfs_create_link+0x43/0xb0 [ 45.695354] [] device_add+0x677/0x1350 [ 45.700967] [] ? device_private_init+0x180/0x180 [ 45.707363] [] ? kfree_const+0x1d/0x20 [ 45.713036] [] ? kobject_set_name_vargs+0xb4/0x130 [ 45.719698] [] device_create_groups_vargs+0x1c8/0x220 [ 45.726530] [] device_create+0x88/0xa0 [ 45.732058] [] ? device_create_vargs+0x20/0x20 [ 45.738266] [] ? macvlan_set_mac_address+0x150/0x150 [ 45.745003] [] macvtap_device_event+0x1c4/0x2a0 [ 45.751305] [] notifier_call_chain+0x8b/0x170 [ 45.757420] [] raw_notifier_call_chain+0x11/0x20 [ 45.763830] [] call_netdevice_notifiers_info+0x47/0x80 [ 45.770744] [] register_netdevice+0x8e8/0xd00 [ 45.776933] [] ? netdev_change_features+0x80/0x80 [ 45.783416] [] ? dev_get_nest_level+0x10c/0x1a0 [ 45.789726] [] macvlan_common_newlink+0x8b9/0x1090 [ 45.796274] [] macvtap_newlink+0xbf/0x110 [ 45.802044] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.808350] [] rtnl_newlink+0xd4b/0x1230 [ 45.814040] [] ? rtnl_link_ops_get+0x5d/0x90 [ 45.820077] [] ? rtnl_newlink+0x319/0x1230 [ 45.825953] [] ? __enqueue_entity+0x134/0x230 [ 45.832176] [] ? rtnl_setlink+0x2f0/0x2f0 [ 45.838046] [] ? __kernel_text_address+0x61/0xa0 [ 45.844425] [] ? print_context_stack+0x6f/0xc0 [ 45.850641] [] ? __module_text_address+0x13/0x150 [ 45.857449] [] ? __module_text_address+0x13/0x150 [ 45.863941] [] ? is_module_text_address+0x2a/0x50 [ 45.870407] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.876881] [] rtnetlink_rcv_msg+0x222/0x680 [ 45.882935] [] ? rtnetlink_rcv+0x30/0x30 [ 45.888847] [] ? mutex_lock_nested+0x5fd/0xb30 [ 45.895081] [] ? rtnetlink_rcv+0x16/0x30 [ 45.900795] [] ? netlink_seq_start+0xe0/0xe0 [ 45.906823] [] ? netlink_deliver_tap+0x73/0x850 [ 45.913123] [] netlink_rcv_skb+0x242/0x350 [ 45.918977] [] ? rtnetlink_rcv+0x30/0x30 [ 45.924656] [] rtnetlink_rcv+0x25/0x30 [ 45.930300] [] netlink_unicast+0x3da/0x560 [ 45.936350] [] ? netlink_sendskb+0x40/0x40 [ 45.942207] [] netlink_sendmsg+0x9bb/0xb40 [ 45.948063] [] ? nlmsg_notify+0xf0/0xf0 [ 45.953661] [] ? __might_fault+0xf1/0x1b0 [ 45.959573] [] ? security_socket_sendmsg+0x6a/0xa0 [ 45.966147] [] ? nlmsg_notify+0xf0/0xf0 [ 45.971753] [] sock_sendmsg+0xb5/0xf0 [ 45.977222] [] SyS_sendto+0x1ca/0x290 [ 45.982937] [] ? SyS_getpeername+0x240/0x240 [ 45.989259] [] ? kmem_cache_free+0x312/0x430 [ 45.995313] [] ? mntput_no_expire+0xce/0x600 [ 46.001603] [] ? mnt_get_count+0x1c0/0x1c0 [ 46.007473] [] ? mntput+0x52/0x70 [ 46.012555] [] ? task_work_run+0x14a/0x200 [ 46.018514] [] ? trace_hardirqs_off+0xd/0x10 [ 46.024589] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 46.031153] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 46.037920] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 46.045881] Kernel Offset: disabled