Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 29.488319] IPVS: Creating netns size=2712 id=1 [ 29.493204] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.181' (ECDSA) to the list of known hosts. 2020/10/08 13:38:41 parsed 1 programs 2020/10/08 13:38:41 executed programs: 0 [ 36.840306] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 36.854111] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 36.868308] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 36.878809] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 36.888424] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 36.889638] IPVS: Creating netns size=2712 id=2 [ 36.889743] IPVS: ftp: loaded support on port[0] = 21 [ 36.908645] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 36.969305] IPVS: Creating netns size=2712 id=3 [ 36.974112] IPVS: ftp: loaded support on port[0] = 21 [ 37.092958] chnl_net:caif_netlink_parms(): no params data found [ 37.124196] IPVS: Creating netns size=2712 id=4 [ 37.133146] IPVS: ftp: loaded support on port[0] = 21 [ 37.291531] chnl_net:caif_netlink_parms(): no params data found [ 37.339318] IPVS: Creating netns size=2712 id=5 [ 37.344501] IPVS: ftp: loaded support on port[0] = 21 [ 37.389155] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.399244] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.411746] device bridge_slave_0 entered promiscuous mode [ 37.422721] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.431844] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.441795] device bridge_slave_1 entered promiscuous mode [ 37.512930] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.537950] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.633981] IPVS: Creating netns size=2712 id=6 [ 37.640946] IPVS: ftp: loaded support on port[0] = 21 [ 37.802427] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.810285] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.819659] device bridge_slave_0 entered promiscuous mode [ 37.842007] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 37.850752] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.857744] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.866621] device bridge_slave_1 entered promiscuous mode [ 37.887124] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 37.912538] chnl_net:caif_netlink_parms(): no params data found [ 37.933678] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.979053] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 37.992204] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 38.037509] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 38.082503] IPVS: Creating netns size=2712 id=7 [ 38.092382] IPVS: ftp: loaded support on port[0] = 21 [ 38.284404] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 38.330070] chnl_net:caif_netlink_parms(): no params data found [ 38.349423] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 38.476216] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 38.527470] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 38.616037] bridge0: port 1(bridge_slave_0) entered blocking state [ 38.623389] bridge0: port 1(bridge_slave_0) entered disabled state [ 38.635464] device bridge_slave_0 entered promiscuous mode [ 38.668914] chnl_net:caif_netlink_parms(): no params data found [ 38.682534] bridge0: port 2(bridge_slave_1) entered blocking state [ 38.690200] bridge0: port 2(bridge_slave_1) entered disabled state [ 38.700468] device bridge_slave_1 entered promiscuous mode [ 38.768558] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 38.809533] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 38.817941] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 38.869170] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.113404] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.120472] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.129874] device bridge_slave_0 entered promiscuous mode [ 39.164635] chnl_net:caif_netlink_parms(): no params data found [ 39.197988] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.204774] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.214186] device bridge_slave_1 entered promiscuous mode [ 39.280372] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 39.312170] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.329489] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 39.380655] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.484810] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.491440] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.501163] device bridge_slave_0 entered promiscuous mode [ 39.543698] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.550722] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.560133] device bridge_slave_1 entered promiscuous mode [ 39.598309] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 39.606119] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 39.613764] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 39.707352] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.767147] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.777425] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.785077] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.793723] device bridge_slave_0 entered promiscuous mode [ 39.844975] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.851386] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.860516] device bridge_slave_1 entered promiscuous mode [ 39.951930] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 39.962608] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 39.972418] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.993449] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 40.021344] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 40.187794] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 40.202800] ------------[ cut here ]------------ [ 40.208571] WARNING: CPU: 0 PID: 5906 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 40.216436] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 40.223577] Kernel panic - not syncing: panic_on_warn set ... [ 40.223577] [ 40.231373] CPU: 0 PID: 5906 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 [ 40.240928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.250357] 0000000000000000 ffff8801294aefc8 ffffffff82e18b12 ffffffff85e81040 [ 40.258445] ffff8801294af0a0 ffffffff85f2bc00 ffffffff8191bd7b 0000000000000009 [ 40.267509] ffff8801294af090 ffffffff8160d884 0000000041b58ab3 ffffffff86b4158a [ 40.276951] Call Trace: [ 40.279622] [] dump_stack+0x136/0x1d4 [ 40.285078] [] ? sysfs_warn_dup+0x7b/0xa0 [ 40.291758] [] panic+0x1af/0x348 [ 40.297837] [] ? to_vmem_altmap+0x125/0x125 [ 40.304797] [] ? sysfs_warn_dup+0x7b/0xa0 [ 40.312339] [] __warn+0x18d/0x1b0 [ 40.317437] [] warn_slowpath_fmt+0x92/0xb0 [ 40.323778] [] ? __warn+0x1b0/0x1b0 [ 40.329059] [] ? kernfs_path_from_node+0x4a/0x60 [ 40.335450] [] sysfs_warn_dup+0x7b/0xa0 [ 40.341061] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 40.348155] [] sysfs_create_link+0x43/0xb0 [ 40.354760] [] device_add+0x677/0x1350 [ 40.360281] [] ? device_private_init+0x180/0x180 [ 40.366929] [] ? kfree_const+0x1d/0x20 [ 40.372450] [] ? kobject_set_name_vargs+0xb4/0x130 [ 40.379139] [] device_create_groups_vargs+0x1c8/0x220 [ 40.386064] [] device_create+0x88/0xa0 [ 40.394648] [] ? device_create_vargs+0x20/0x20 [ 40.400921] [] ? macvlan_set_mac_address+0x150/0x150 [ 40.407772] [] macvtap_device_event+0x1c4/0x2a0 [ 40.414182] [] notifier_call_chain+0x8b/0x170 [ 40.420525] [] raw_notifier_call_chain+0x11/0x20 [ 40.426934] [] call_netdevice_notifiers_info+0x47/0x80 [ 40.433851] [] register_netdevice+0x8e8/0xd00 [ 40.440024] [] ? netdev_change_features+0x80/0x80 [ 40.446515] [] ? dev_get_nest_level+0x10c/0x1a0 [ 40.457132] [] macvlan_common_newlink+0x8b9/0x1090 [ 40.463816] [] macvtap_newlink+0xbf/0x110 [ 40.469649] [] ? __netlink_ns_capable+0xc7/0xf0 [ 40.476732] [] rtnl_newlink+0xd4b/0x1230 [ 40.483094] [] ? rtnl_link_ops_get+0x5d/0x90 [ 40.489285] [] ? rtnl_newlink+0x319/0x1230 [ 40.495166] [] ? cpuacct_charge+0x16c/0x300 [ 40.501133] [] ? rtnl_setlink+0x2f0/0x2f0 [ 40.507977] [] ? cpuacct_charge+0x189/0x300 [ 40.514580] [] ? cpuacct_css_alloc+0x160/0x160 [ 40.520807] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 40.528035] [] ? __netlink_ns_capable+0xc7/0xf0 [ 40.534346] [] rtnetlink_rcv_msg+0x222/0x680 [ 40.540508] [] ? rtnetlink_rcv+0x30/0x30 [ 40.546199] [] ? mutex_lock_nested+0x5fd/0xb30 [ 40.552426] [] ? rtnetlink_rcv+0x16/0x30 [ 40.558119] [] ? netlink_seq_start+0xe0/0xe0 [ 40.564241] [] netlink_rcv_skb+0x242/0x350 [ 40.570256] [] ? rtnetlink_rcv+0x30/0x30 [ 40.576140] [] rtnetlink_rcv+0x25/0x30 [ 40.581656] [] netlink_unicast+0x3da/0x560 [ 40.587921] [] ? netlink_sendskb+0x40/0x40 [ 40.594162] [] netlink_sendmsg+0x9bb/0xb40 [ 40.601089] [] ? nlmsg_notify+0xf0/0xf0 [ 40.606825] [] ? __might_fault+0xf1/0x1b0 [ 40.613043] [] ? security_socket_sendmsg+0x6a/0xa0 [ 40.619611] [] ? nlmsg_notify+0xf0/0xf0 [ 40.625353] [] sock_sendmsg+0xb5/0xf0 [ 40.630780] [] SyS_sendto+0x1ca/0x290 [ 40.636558] [] ? SyS_getpeername+0x240/0x240 [ 40.642603] [] ? kmem_cache_free+0x312/0x430 [ 40.648655] [] ? mntput_no_expire+0xce/0x600 [ 40.654703] [] ? mnt_get_count+0x1c0/0x1c0 [ 40.660564] [] ? mntput+0x52/0x70 [ 40.665653] [] ? task_work_run+0x14a/0x200 [ 40.671562] [] ? trace_hardirqs_off+0xd/0x10 [ 40.677630] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 40.684198] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 40.690772] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 40.698419] Kernel Offset: disabled