[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 37.573700] IPVS: Creating netns size=2712 id=1 [ 37.579421] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.176' (ECDSA) to the list of known hosts. 2020/09/23 11:00:03 parsed 1 programs 2020/09/23 11:00:03 executed programs: 0 [ 45.447449] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 45.480399] IPVS: Creating netns size=2712 id=2 [ 45.485248] IPVS: ftp: loaded support on port[0] = 21 [ 45.502531] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 45.511410] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 45.523166] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 45.544370] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 45.554073] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 45.643870] IPVS: Creating netns size=2712 id=3 [ 45.649728] IPVS: ftp: loaded support on port[0] = 21 [ 45.811843] chnl_net:caif_netlink_parms(): no params data found [ 45.829836] IPVS: Creating netns size=2712 id=4 [ 45.834710] IPVS: ftp: loaded support on port[0] = 21 [ 46.058640] chnl_net:caif_netlink_parms(): no params data found [ 46.074924] IPVS: Creating netns size=2712 id=5 [ 46.081820] IPVS: ftp: loaded support on port[0] = 21 [ 46.325409] chnl_net:caif_netlink_parms(): no params data found [ 46.354560] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.361706] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.371700] device bridge_slave_0 entered promiscuous mode [ 46.391226] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.397831] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.406664] device bridge_slave_1 entered promiscuous mode [ 46.435908] IPVS: Creating netns size=2712 id=6 [ 46.441582] IPVS: ftp: loaded support on port[0] = 21 [ 46.516254] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.584542] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.819634] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.825998] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.836504] device bridge_slave_0 entered promiscuous mode [ 46.858429] IPVS: Creating netns size=2712 id=7 [ 46.863273] IPVS: ftp: loaded support on port[0] = 21 [ 46.900715] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.913363] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.923214] device bridge_slave_1 entered promiscuous mode [ 46.967392] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 47.019538] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.027930] chnl_net:caif_netlink_parms(): no params data found [ 47.072252] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 47.083505] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.092649] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.099128] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.108556] device bridge_slave_0 entered promiscuous mode [ 47.116190] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.122555] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.131837] device bridge_slave_1 entered promiscuous mode [ 47.147296] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.230352] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.357364] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.428181] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.535631] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.604057] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.668323] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.676804] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.713673] chnl_net:caif_netlink_parms(): no params data found [ 47.902624] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.964975] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.972062] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.982499] device bridge_slave_0 entered promiscuous mode [ 47.990320] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.066402] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.072830] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.082429] device bridge_slave_1 entered promiscuous mode [ 48.112008] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.193722] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.239008] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.328718] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.367486] chnl_net:caif_netlink_parms(): no params data found [ 48.503475] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.542584] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.550041] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.559517] device bridge_slave_0 entered promiscuous mode [ 48.568143] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.574722] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.584058] device bridge_slave_1 entered promiscuous mode [ 48.591631] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.789408] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.853213] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.958867] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.968609] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 49.012264] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 49.248960] ------------[ cut here ]------------ [ 49.253735] WARNING: CPU: 1 PID: 5907 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 49.262835] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 49.269909] Kernel panic - not syncing: panic_on_warn set ... [ 49.269909] [ 49.277276] CPU: 1 PID: 5907 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 49.284787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.294124] 0000000000000000 ffff8800b2716ef0 ffffffff836c94e1 1ffffffff11345ba [ 49.302151] 0000000041b58ab3 ffffffff882802cf ffffffff836c9324 ffff8800b2716eb0 [ 49.310137] 0000000000000000 ffff8800b2716eb8 ffffffff81586869 0000000000000540 [ 49.318864] Call Trace: [ 49.321450] [] dump_stack+0x1bd/0x29c [ 49.326877] [] ? _atomic_dec_and_lock+0xc4/0xc4 [ 49.333188] [] ? wake_up_klogd+0x89/0xe0 [ 49.338873] [] ? sysfs_warn_dup+0x7b/0xa0 [ 49.344654] [] panic+0x1bb/0x44a [ 49.349661] [] ? copy_signal+0xb38/0xb38 [ 49.355344] [] __warn+0x194/0x1d0 [ 49.360417] [] warn_slowpath_fmt+0x92/0xb0 [ 49.366299] [] ? __warn+0x1d0/0x1d0 [ 49.371564] [] ? kernfs_path_from_node+0x4a/0x60 [ 49.377957] [] sysfs_warn_dup+0x7b/0xa0 [ 49.383554] [] sysfs_do_create_link_sd+0xeb/0x110 [ 49.390017] [] sysfs_create_link+0x3f/0xb0 [ 49.395894] [] device_add+0x47c/0x15d0 [ 49.401679] [] ? device_private_init+0x230/0x230 [ 49.408068] [] ? kfree_const+0x1d/0x20 [ 49.413580] [] device_create_groups_vargs+0x1c8/0x220 [ 49.420395] [] device_create+0x88/0xa0 [ 49.425909] [] ? device_create_vargs+0x20/0x20 [ 49.432126] [] ? macvlan_set_mac_address+0x1c0/0x1c0 [ 49.438875] [] macvtap_device_event+0x228/0x350 [ 49.445693] [] notifier_call_chain+0xac/0x280 [ 49.451838] [] raw_notifier_call_chain+0x11/0x20 [ 49.458236] [] call_netdevice_notifiers_info+0x4c/0x90 [ 49.465148] [] register_netdevice+0x9d7/0x1310 [ 49.471382] [] ? dev_get_nest_level+0x1a9/0x2d0 [ 49.477942] [] ? netdev_change_features+0x80/0x80 [ 49.484422] [] macvlan_common_newlink+0xa15/0x1720 [ 49.491015] [] ? macvlan_uninit+0x160/0x160 [ 49.496972] [] ? alloc_netdev_mqs+0xa36/0xfd0 [ 49.503116] [] macvtap_newlink+0x128/0x230 [ 49.508993] [] ? macvtap_get_socket+0xa0/0xa0 [ 49.515130] [] ? rtnl_create_link+0x169/0xad0 [ 49.521265] [] ? __netlink_ns_capable+0xe2/0x150 [ 49.527658] [] rtnl_newlink+0xe5e/0x1780 [ 49.533368] [] ? rtnl_link_ops_get+0x62/0xa0 [ 49.539403] [] ? rtnl_newlink+0x36c/0x1780 [ 49.545265] [] ? rtnl_setlink+0x360/0x360 [ 49.551048] [] ? debug_check_no_locks_freed+0x4c0/0x4c0 [ 49.558072] [] ? mark_held_locks+0xff/0x280 [ 49.564024] [] ? trace_hardirqs_on_caller+0x49c/0x6f0 [ 49.570851] [] ? __netlink_ns_capable+0xe2/0x150 [ 49.577323] [] ? rtnl_setlink+0x360/0x360 [ 49.583115] [] rtnetlink_rcv_msg+0x22b/0xc20 [ 49.589162] [] ? mutex_lock_nested+0x617/0xca0 [ 49.595399] [] ? rtnetlink_rcv+0x16/0x30 [ 49.601085] [] ? rtnl_link_unregister+0x210/0x210 [ 49.607908] [] ? mutex_trylock+0x6b0/0x6b0 [ 49.613775] [] netlink_rcv_skb+0x1bb/0x2c0 [ 49.619675] [] ? rtnl_link_unregister+0x210/0x210 [ 49.626145] [] rtnetlink_rcv+0x25/0x30 [ 49.631674] [] netlink_unicast+0x419/0x630 [ 49.637551] [] ? netlink_sendskb+0x40/0x40 [ 49.643425] [] netlink_sendmsg+0x9a3/0xeb0 [ 49.649311] [] ? nlmsg_notify+0x120/0x120 [ 49.655100] [] ? nlmsg_notify+0x120/0x120 [ 49.660880] [] sock_sendmsg+0xdd/0x160 [ 49.666416] [] SyS_sendto+0x1dd/0x2d0 [ 49.671847] [] ? SyS_getpeername+0x270/0x270 [ 49.678435] [] ? mntput_no_expire+0xfb/0x7a0 [ 49.684479] [] ? mnt_get_count+0x2e0/0x2e0 [ 49.690364] [] ? mntput+0x57/0x80 [ 49.695460] [] ? mem_cgroup_oom_synchronize+0xb00/0xb00 [ 49.702449] [] ? trace_hardirqs_on_caller+0x49c/0x6f0 [ 49.709288] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 49.715847] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 49.723585] Kernel Offset: disabled