[ 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: [ 35.080581] IPVS: Creating netns size=2712 id=1 [ 35.085387] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.104' (ECDSA) to the list of known hosts. 2020/07/31 01:25:41 parsed 1 programs 2020/07/31 01:25:41 executed programs: 0 [ 42.576799] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 42.594403] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 42.606835] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 42.614611] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 42.623002] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 42.631128] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 42.648035] IPVS: Creating netns size=2712 id=2 [ 42.652913] IPVS: ftp: loaded support on port[0] = 21 [ 42.724479] IPVS: Creating netns size=2712 id=3 [ 42.730327] IPVS: ftp: loaded support on port[0] = 21 [ 42.876465] chnl_net:caif_netlink_parms(): no params data found [ 42.891419] IPVS: Creating netns size=2712 id=4 [ 42.896830] IPVS: ftp: loaded support on port[0] = 21 [ 43.108271] IPVS: Creating netns size=2712 id=5 [ 43.110161] chnl_net:caif_netlink_parms(): no params data found [ 43.120564] IPVS: ftp: loaded support on port[0] = 21 [ 43.219346] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.225867] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.236124] device bridge_slave_0 entered promiscuous mode [ 43.307692] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.314265] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.323406] device bridge_slave_1 entered promiscuous mode [ 43.424891] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.444305] chnl_net:caif_netlink_parms(): no params data found [ 43.460987] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.530330] IPVS: Creating netns size=2712 id=6 [ 43.535159] IPVS: ftp: loaded support on port[0] = 21 [ 43.731643] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.738127] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.747596] device bridge_slave_0 entered promiscuous mode [ 43.786418] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.793370] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.803818] device bridge_slave_1 entered promiscuous mode [ 43.846190] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.888285] chnl_net:caif_netlink_parms(): no params data found [ 43.903788] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.941069] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.951260] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.966061] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.994941] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.020983] IPVS: Creating netns size=2712 id=7 [ 44.025806] IPVS: ftp: loaded support on port[0] = 21 [ 44.117918] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.124425] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.133578] device bridge_slave_0 entered promiscuous mode [ 44.192706] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.199244] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.209315] device bridge_slave_1 entered promiscuous mode [ 44.311198] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.332757] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.361802] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.396675] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.589148] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.626492] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.673692] chnl_net:caif_netlink_parms(): no params data found [ 44.796524] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.827040] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.833744] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.843002] device bridge_slave_0 entered promiscuous mode [ 44.850905] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.857314] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.867239] device bridge_slave_1 entered promiscuous mode [ 44.874347] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.965163] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.040184] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.060462] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.135305] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.335880] chnl_net:caif_netlink_parms(): no params data found [ 45.383958] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.464640] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.472427] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.480407] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.489886] device bridge_slave_0 entered promiscuous mode [ 45.549219] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.555599] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.565453] device bridge_slave_1 entered promiscuous mode [ 45.588368] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.649190] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.701439] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 45.756462] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.821448] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.859022] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.898554] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.937949] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 46.069855] ------------[ cut here ]------------ [ 46.074665] WARNING: CPU: 1 PID: 5895 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 46.082721] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 46.089854] Kernel panic - not syncing: panic_on_warn set ... [ 46.089854] [ 46.097200] CPU: 1 PID: 5895 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0 [ 46.104735] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.114119] 0000000000000000 ffff8800ba3e6fc8 ffffffff82c65e52 ffffffff85c81040 [ 46.122242] ffff8800ba3e70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 46.130348] ffff8800ba3e7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3a9a [ 46.138343] Call Trace: [ 46.140903] [] dump_stack+0x136/0x1d4 [ 46.146324] [] ? sysfs_warn_dup+0x7b/0xa0 [ 46.152095] [] panic+0x1af/0x348 [ 46.157090] [] ? to_vmem_altmap+0x125/0x125 [ 46.163032] [] ? sysfs_warn_dup+0x7b/0xa0 [ 46.168802] [] __warn+0x18d/0x1b0 [ 46.173874] [] warn_slowpath_fmt+0x92/0xb0 [ 46.179729] [] ? __warn+0x1b0/0x1b0 [ 46.184977] [] ? kernfs_path_from_node+0x4a/0x60 [ 46.191354] [] sysfs_warn_dup+0x7b/0xa0 [ 46.196963] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 46.203947] [] sysfs_create_link+0x43/0xb0 [ 46.209830] [] device_add+0x677/0x1350 [ 46.215337] [] ? device_private_init+0x180/0x180 [ 46.221713] [] ? kfree_const+0x1d/0x20 [ 46.227225] [] ? kobject_set_name_vargs+0xb4/0x130 [ 46.233804] [] device_create_groups_vargs+0x1c8/0x220 [ 46.240665] [] device_create+0x88/0xa0 [ 46.246173] [] ? device_create_vargs+0x20/0x20 [ 46.252376] [] ? macvlan_set_mac_address+0x150/0x150 [ 46.259119] [] macvtap_device_event+0x1c4/0x2a0 [ 46.265408] [] notifier_call_chain+0x8b/0x170 [ 46.271524] [] raw_notifier_call_chain+0x11/0x20 [ 46.277900] [] call_netdevice_notifiers_info+0x47/0x80 [ 46.284796] [] register_netdevice+0x8e8/0xd00 [ 46.290930] [] ? netdev_change_features+0x80/0x80 [ 46.297395] [] ? dev_get_nest_level+0x10c/0x1a0 [ 46.303684] [] macvlan_common_newlink+0x8b9/0x1090 [ 46.310238] [] macvtap_newlink+0xbf/0x110 [ 46.316013] [] ? __netlink_ns_capable+0xc7/0xf0 [ 46.322303] [] rtnl_newlink+0xd4b/0x1230 [ 46.328011] [] ? rtnl_link_ops_get+0x5d/0x90 [ 46.334049] [] ? rtnl_newlink+0x319/0x1230 [ 46.339906] [] ? __enqueue_entity+0x134/0x230 [ 46.346021] [] ? rtnl_setlink+0x2f0/0x2f0 [ 46.351815] [] ? __kernel_text_address+0x61/0xa0 [ 46.358208] [] ? print_context_stack+0x6f/0xc0 [ 46.364590] [] ? __module_text_address+0x13/0x150 [ 46.371105] [] ? __module_text_address+0x13/0x150 [ 46.377573] [] ? is_module_text_address+0x2a/0x50 [ 46.384041] [] ? __netlink_ns_capable+0xc7/0xf0 [ 46.390347] [] rtnetlink_rcv_msg+0x222/0x680 [ 46.396390] [] ? rtnetlink_rcv+0x30/0x30 [ 46.402100] [] ? mutex_lock_nested+0x5fd/0xb30 [ 46.408305] [] ? rtnetlink_rcv+0x16/0x30 [ 46.413999] [] ? netlink_seq_start+0xe0/0xe0 [ 46.420041] [] ? netlink_deliver_tap+0x73/0x850 [ 46.426381] [] netlink_rcv_skb+0x242/0x350 [ 46.432252] [] ? rtnetlink_rcv+0x30/0x30 [ 46.437940] [] rtnetlink_rcv+0x25/0x30 [ 46.443451] [] netlink_unicast+0x3da/0x560 [ 46.449364] [] ? netlink_sendskb+0x40/0x40 [ 46.455220] [] netlink_sendmsg+0x9bb/0xb40 [ 46.461076] [] ? nlmsg_notify+0xf0/0xf0 [ 46.466673] [] ? __might_fault+0xf1/0x1b0 [ 46.472460] [] ? security_socket_sendmsg+0x6a/0xa0 [ 46.479027] [] ? nlmsg_notify+0xf0/0xf0 [ 46.484621] [] sock_sendmsg+0xb5/0xf0 [ 46.490043] [] SyS_sendto+0x1ca/0x290 [ 46.495481] [] ? SyS_getpeername+0x240/0x240 [ 46.501525] [] ? kmem_cache_free+0x312/0x430 [ 46.507573] [] ? mntput_no_expire+0xce/0x600 [ 46.513603] [] ? mnt_get_count+0x1c0/0x1c0 [ 46.519459] [] ? mntput+0x52/0x70 [ 46.524533] [] ? task_work_run+0x14a/0x200 [ 46.530391] [] ? trace_hardirqs_off+0xd/0x10 [ 46.536575] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 46.543128] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 46.549681] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 46.557500] Kernel Offset: disabled