[ 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: [ 36.624176] IPVS: Creating netns size=2712 id=1 [ 36.628974] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. 2020/10/02 19:42:23 parsed 1 programs 2020/10/02 19:42:23 executed programs: 0 [ 44.518199] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 44.530528] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 44.540798] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 44.551240] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 44.562351] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 44.571873] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 44.588350] IPVS: Creating netns size=2712 id=2 [ 44.593116] IPVS: ftp: loaded support on port[0] = 21 [ 44.674550] IPVS: Creating netns size=2712 id=3 [ 44.680633] IPVS: ftp: loaded support on port[0] = 21 [ 44.835213] chnl_net:caif_netlink_parms(): no params data found [ 44.876328] IPVS: Creating netns size=2712 id=4 [ 44.886689] IPVS: ftp: loaded support on port[0] = 21 [ 45.076321] chnl_net:caif_netlink_parms(): no params data found [ 45.148550] IPVS: Creating netns size=2712 id=5 [ 45.153384] IPVS: ftp: loaded support on port[0] = 21 [ 45.209524] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.217135] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.226127] device bridge_slave_0 entered promiscuous mode [ 45.245261] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.251799] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.261132] device bridge_slave_1 entered promiscuous mode [ 45.374164] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.411520] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.441749] IPVS: Creating netns size=2712 id=6 [ 45.447510] IPVS: ftp: loaded support on port[0] = 21 [ 45.618649] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.625046] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.635312] device bridge_slave_0 entered promiscuous mode [ 45.677858] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.684228] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.693817] device bridge_slave_1 entered promiscuous mode [ 45.833710] chnl_net:caif_netlink_parms(): no params data found [ 45.852336] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.863824] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.899390] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 46.009857] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 46.019026] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.073463] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.144433] chnl_net:caif_netlink_parms(): no params data found [ 46.157158] IPVS: Creating netns size=2712 id=7 [ 46.161991] IPVS: ftp: loaded support on port[0] = 21 [ 46.296256] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.354824] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.363708] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.372120] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.587806] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.594200] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.603601] device bridge_slave_0 entered promiscuous mode [ 46.667541] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.673927] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.684167] device bridge_slave_1 entered promiscuous mode [ 46.719018] chnl_net:caif_netlink_parms(): no params data found [ 46.780630] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.801824] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.811255] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.879145] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.001196] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.008725] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.019940] device bridge_slave_0 entered promiscuous mode [ 47.143817] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.151724] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.162121] device bridge_slave_1 entered promiscuous mode [ 47.422311] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.465453] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.516849] chnl_net:caif_netlink_parms(): no params data found [ 47.537044] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.599321] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.775656] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.782049] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.791945] device bridge_slave_0 entered promiscuous mode [ 47.844070] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.850604] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.862355] device bridge_slave_1 entered promiscuous mode [ 47.871430] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 47.879322] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.929082] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.997866] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.006601] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.017865] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 48.059052] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.133375] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.218756] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.225286] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.234327] device bridge_slave_0 entered promiscuous mode [ 48.289707] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.296226] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.306274] device bridge_slave_1 entered promiscuous mode [ 48.316514] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.387214] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.514755] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.562341] ------------[ cut here ]------------ [ 48.567701] WARNING: CPU: 1 PID: 5943 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 48.576047] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 48.583068] Kernel panic - not syncing: panic_on_warn set ... [ 48.583068] [ 48.590457] CPU: 1 PID: 5943 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 48.597978] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.607305] 0000000000000000 ffff8800b2636fc8 ffffffff82e18b12 ffffffff85e81040 [ 48.615313] ffff8800b26370a0 ffffffff85f2bc00 ffffffff8191bd7b 0000000000000009 [ 48.623331] ffff8800b2637090 ffffffff8160d884 0000000041b58ab3 ffffffff86b4158a [ 48.631311] Call Trace: [ 48.633890] [] dump_stack+0x136/0x1d4 [ 48.639311] [] ? sysfs_warn_dup+0x7b/0xa0 [ 48.645080] [] panic+0x1af/0x348 [ 48.650066] [] ? to_vmem_altmap+0x125/0x125 [ 48.656005] [] ? sysfs_warn_dup+0x7b/0xa0 [ 48.661774] [] __warn+0x18d/0x1b0 [ 48.666853] [] warn_slowpath_fmt+0x92/0xb0 [ 48.672708] [] ? __warn+0x1b0/0x1b0 [ 48.677957] [] ? kernfs_path_from_node+0x4a/0x60 [ 48.684347] [] sysfs_warn_dup+0x7b/0xa0 [ 48.689942] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 48.696924] [] sysfs_create_link+0x43/0xb0 [ 48.702973] [] device_add+0x677/0x1350 [ 48.708499] [] ? device_private_init+0x180/0x180 [ 48.714875] [] ? kfree_const+0x1d/0x20 [ 48.720380] [] ? kobject_set_name_vargs+0xb4/0x130 [ 48.726929] [] device_create_groups_vargs+0x1c8/0x220 [ 48.733753] [] device_create+0x88/0xa0 [ 48.739260] [] ? device_create_vargs+0x20/0x20 [ 48.745478] [] ? macvlan_set_mac_address+0x150/0x150 [ 48.752202] [] macvtap_device_event+0x1c4/0x2a0 [ 48.758490] [] notifier_call_chain+0x8b/0x170 [ 48.764605] [] raw_notifier_call_chain+0x11/0x20 [ 48.770987] [] call_netdevice_notifiers_info+0x47/0x80 [ 48.777887] [] register_netdevice+0x8e8/0xd00 [ 48.784003] [] ? netdev_change_features+0x80/0x80 [ 48.790463] [] ? dev_get_nest_level+0x10c/0x1a0 [ 48.796752] [] macvlan_common_newlink+0x8b9/0x1090 [ 48.803299] [] macvtap_newlink+0xbf/0x110 [ 48.809083] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.815388] [] rtnl_newlink+0xd4b/0x1230 [ 48.821068] [] ? rtnl_link_ops_get+0x5d/0x90 [ 48.827096] [] ? rtnl_newlink+0x319/0x1230 [ 48.832952] [] ? find_next_bit+0x15/0x20 [ 48.838648] [] ? rtnl_setlink+0x2f0/0x2f0 [ 48.844432] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 48.851156] [] ? __lock_acquire+0x15c3/0x5990 [ 48.857271] [] ? update_blocked_averages+0x8f7/0x1540 [ 48.864092] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 48.871077] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.877382] [] rtnetlink_rcv_msg+0x222/0x680 [ 48.883408] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 48.890216] [] ? rtnetlink_rcv+0x30/0x30 [ 48.895898] [] ? mutex_lock_nested+0x5fd/0xb30 [ 48.902915] [] ? rtnetlink_rcv+0x16/0x30 [ 48.908613] [] ? netlink_seq_start+0xe0/0xe0 [ 48.914648] [] netlink_rcv_skb+0x242/0x350 [ 48.920502] [] ? rtnetlink_rcv+0x30/0x30 [ 48.926182] [] rtnetlink_rcv+0x25/0x30 [ 48.931687] [] netlink_unicast+0x3da/0x560 [ 48.937556] [] ? netlink_sendskb+0x40/0x40 [ 48.943410] [] netlink_sendmsg+0x9bb/0xb40 [ 48.949266] [] ? nlmsg_notify+0xf0/0xf0 [ 48.954863] [] ? __might_fault+0xf1/0x1b0 [ 48.960632] [] ? nlmsg_notify+0xf0/0xf0 [ 48.966242] [] sock_sendmsg+0xb5/0xf0 [ 48.971686] [] SyS_sendto+0x1ca/0x290 [ 48.977106] [] ? SyS_getpeername+0x240/0x240 [ 48.983135] [] ? mntput_no_expire+0xce/0x600 [ 48.989163] [] ? mnt_get_count+0x1c0/0x1c0 [ 48.995019] [] ? mntput+0x52/0x70 [ 49.000133] [] ? task_work_run+0x14a/0x200 [ 49.006004] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 49.012815] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 49.019364] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 49.027456] Kernel Offset: disabled