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: [ 31.310056] IPVS: Creating netns size=2712 id=1 [ 31.314880] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.81' (ECDSA) to the list of known hosts. 2020/05/03 23:18:03 parsed 1 programs 2020/05/03 23:18:03 executed programs: 0 [ 38.912682] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 38.930395] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 38.941412] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 38.951198] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 38.959429] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 38.968525] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 38.986836] IPVS: Creating netns size=2712 id=2 [ 38.991738] IPVS: ftp: loaded support on port[0] = 21 [ 39.064845] IPVS: Creating netns size=2712 id=3 [ 39.070659] IPVS: ftp: loaded support on port[0] = 21 [ 39.206338] chnl_net:caif_netlink_parms(): no params data found [ 39.243095] IPVS: Creating netns size=2712 id=4 [ 39.250077] IPVS: ftp: loaded support on port[0] = 21 [ 39.436443] chnl_net:caif_netlink_parms(): no params data found [ 39.495885] IPVS: Creating netns size=2712 id=5 [ 39.501052] IPVS: ftp: loaded support on port[0] = 21 [ 39.535057] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.541493] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.551646] device bridge_slave_0 entered promiscuous mode [ 39.578226] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.584816] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.593423] device bridge_slave_1 entered promiscuous mode [ 39.742254] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.767861] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.839668] chnl_net:caif_netlink_parms(): no params data found [ 39.921214] IPVS: Creating netns size=2712 id=6 [ 39.927163] IPVS: ftp: loaded support on port[0] = 21 [ 39.945306] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.951688] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.961303] device bridge_slave_0 entered promiscuous mode [ 40.004750] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.011174] bridge0: port 2(bridge_slave_1) entered disabled state [ 40.021138] device bridge_slave_1 entered promiscuous mode [ 40.073110] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 40.127269] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 40.141936] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 40.157203] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 40.191768] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 40.206727] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 40.349996] IPVS: Creating netns size=2712 id=7 [ 40.359310] IPVS: ftp: loaded support on port[0] = 21 [ 40.424152] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 40.533277] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 40.551284] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.558402] bridge0: port 1(bridge_slave_0) entered disabled state [ 40.567856] device bridge_slave_0 entered promiscuous mode [ 40.635433] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.641800] bridge0: port 2(bridge_slave_1) entered disabled state [ 40.651376] device bridge_slave_1 entered promiscuous mode [ 40.720806] chnl_net:caif_netlink_parms(): no params data found [ 40.832733] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 40.840613] chnl_net:caif_netlink_parms(): no params data found [ 40.859720] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 40.879238] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 40.896831] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.153340] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 41.217381] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 41.350856] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 41.403585] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 41.500772] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.509477] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.519251] device bridge_slave_0 entered promiscuous mode [ 41.559574] chnl_net:caif_netlink_parms(): no params data found [ 41.596498] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.603091] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.611796] device bridge_slave_1 entered promiscuous mode [ 41.629435] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.636256] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.645551] device bridge_slave_0 entered promiscuous mode [ 41.654457] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 41.704241] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.710635] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.719966] device bridge_slave_1 entered promiscuous mode [ 41.814024] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 41.825279] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.856866] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.886474] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 41.896121] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.930089] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.261998] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.269179] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.278972] device bridge_slave_0 entered promiscuous mode [ 42.347656] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.356096] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.367457] device bridge_slave_1 entered promiscuous mode [ 42.456304] ------------[ cut here ]------------ [ 42.461095] WARNING: CPU: 1 PID: 5866 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 42.468917] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 42.476110] Kernel panic - not syncing: panic_on_warn set ... [ 42.476110] [ 42.483447] CPU: 1 PID: 5866 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 [ 42.490957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.500294] 0000000000000000 ffff8800afef6fc8 ffffffff82c65932 ffffffff85c81040 [ 42.508781] ffff8800afef70a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009 [ 42.516807] ffff8800afef7090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a [ 42.525022] Call Trace: [ 42.527598] [] dump_stack+0x136/0x1d4 [ 42.533027] [] ? sysfs_warn_dup+0x7b/0xa0 [ 42.538803] [] panic+0x1af/0x348 [ 42.543881] [] ? to_vmem_altmap+0x125/0x125 [ 42.549842] [] ? sysfs_warn_dup+0x7b/0xa0 [ 42.555759] [] __warn+0x18d/0x1b0 [ 42.560841] [] warn_slowpath_fmt+0x92/0xb0 [ 42.566877] [] ? __warn+0x1b0/0x1b0 [ 42.572334] [] ? kernfs_path_from_node+0x4a/0x60 [ 42.578721] [] sysfs_warn_dup+0x7b/0xa0 [ 42.584590] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 42.591586] [] sysfs_create_link+0x43/0xb0 [ 42.597479] [] device_add+0x677/0x1350 [ 42.603003] [] ? device_private_init+0x180/0x180 [ 42.609379] [] ? kfree_const+0x1d/0x20 [ 42.614889] [] ? kobject_set_name_vargs+0xb4/0x130 [ 42.621466] [] device_create_groups_vargs+0x1c8/0x220 [ 42.628372] [] device_create+0x88/0xa0 [ 42.633881] [] ? device_create_vargs+0x20/0x20 [ 42.640084] [] ? macvlan_set_mac_address+0x150/0x150 [ 42.646896] [] macvtap_device_event+0x1c4/0x2a0 [ 42.653188] [] notifier_call_chain+0x8b/0x170 [ 42.659406] [] raw_notifier_call_chain+0x11/0x20 [ 42.665808] [] call_netdevice_notifiers_info+0x47/0x80 [ 42.672903] [] register_netdevice+0x8e8/0xd00 [ 42.679019] [] ? netdev_change_features+0x80/0x80 [ 42.685488] [] ? dev_get_nest_level+0x10c/0x1a0 [ 42.691809] [] macvlan_common_newlink+0x8b9/0x1090 [ 42.698392] [] macvtap_newlink+0xbf/0x110 [ 42.704356] [] ? __netlink_ns_capable+0xc7/0xf0 [ 42.710672] [] rtnl_newlink+0xd4b/0x1230 [ 42.716519] [] ? rtnl_link_ops_get+0x5d/0x90 [ 42.722549] [] ? rtnl_newlink+0x319/0x1230 [ 42.728860] [] ? __enqueue_entity+0x134/0x230 [ 42.734989] [] ? rtnl_setlink+0x2f0/0x2f0 [ 42.740921] [] ? __kernel_text_address+0x61/0xa0 [ 42.747350] [] ? print_context_stack+0x6f/0xc0 [ 42.753601] [] ? __module_text_address+0x13/0x150 [ 42.760092] [] ? __module_text_address+0x13/0x150 [ 42.766659] [] ? is_module_text_address+0x2a/0x50 [ 42.773506] [] ? __netlink_ns_capable+0xc7/0xf0 [ 42.779823] [] rtnetlink_rcv_msg+0x222/0x680 [ 42.786115] [] ? rtnetlink_rcv+0x30/0x30 [ 42.791801] [] ? mutex_lock_nested+0x5fd/0xb30 [ 42.798014] [] ? rtnetlink_rcv+0x16/0x30 [ 42.803698] [] ? netlink_seq_start+0xe0/0xe0 [ 42.811127] [] ? netlink_deliver_tap+0x73/0x850 [ 42.817449] [] netlink_rcv_skb+0x242/0x350 [ 42.823403] [] ? rtnetlink_rcv+0x30/0x30 [ 42.829151] [] rtnetlink_rcv+0x25/0x30 [ 42.834687] [] netlink_unicast+0x3da/0x560 [ 42.840545] [] ? netlink_sendskb+0x40/0x40 [ 42.846845] [] netlink_sendmsg+0x9bb/0xb40 [ 42.852721] [] ? nlmsg_notify+0xf0/0xf0 [ 42.858331] [] ? __might_fault+0xf1/0x1b0 [ 42.864289] [] ? security_socket_sendmsg+0x6a/0xa0 [ 42.870868] [] ? nlmsg_notify+0xf0/0xf0 [ 42.876478] [] sock_sendmsg+0xb5/0xf0 [ 42.881915] [] SyS_sendto+0x1ca/0x290 [ 42.887342] [] ? SyS_getpeername+0x240/0x240 [ 42.893393] [] ? kmem_cache_free+0x312/0x430 [ 42.899424] [] ? mntput_no_expire+0xce/0x600 [ 42.905461] [] ? mnt_get_count+0x1c0/0x1c0 [ 42.911316] [] ? mntput+0x52/0x70 [ 42.916478] [] ? task_work_run+0x14a/0x200 [ 42.922513] [] ? trace_hardirqs_off+0xd/0x10 [ 42.928651] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 42.935211] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 42.941798] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 42.949782] Kernel Offset: disabled