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: [ 29.396399] IPVS: Creating netns size=2712 id=1 [ 29.401293] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.89' (ECDSA) to the list of known hosts. 2020/10/04 23:30:20 parsed 1 programs 2020/10/04 23:30:20 executed programs: 0 [ 36.701379] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 36.712260] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 36.730686] IPVS: Creating netns size=2712 id=2 [ 36.735473] IPVS: ftp: loaded support on port[0] = 21 [ 36.764372] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 36.772903] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 36.780633] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 36.796480] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 36.850106] IPVS: Creating netns size=2712 id=3 [ 36.855021] IPVS: ftp: loaded support on port[0] = 21 [ 36.980486] chnl_net:caif_netlink_parms(): no params data found [ 36.982483] IPVS: Creating netns size=2712 id=4 [ 36.982592] IPVS: ftp: loaded support on port[0] = 21 [ 37.115101] IPVS: Creating netns size=2712 id=5 [ 37.120119] IPVS: ftp: loaded support on port[0] = 21 [ 37.261741] chnl_net:caif_netlink_parms(): no params data found [ 37.368914] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.375294] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.385071] device bridge_slave_0 entered promiscuous mode [ 37.403905] IPVS: Creating netns size=2712 id=6 [ 37.413362] IPVS: ftp: loaded support on port[0] = 21 [ 37.414184] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.414253] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.418119] device bridge_slave_1 entered promiscuous mode [ 37.531952] chnl_net:caif_netlink_parms(): no params data found [ 37.548902] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.578934] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.708379] chnl_net:caif_netlink_parms(): no params data found [ 37.834550] IPVS: Creating netns size=2712 id=7 [ 37.840266] IPVS: ftp: loaded support on port[0] = 21 [ 37.848233] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 37.859023] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.868951] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.880935] device bridge_slave_0 entered promiscuous mode [ 37.910499] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 37.923540] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.930374] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.938899] device bridge_slave_1 entered promiscuous mode [ 37.954624] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.999602] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 38.106859] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 38.163797] bridge0: port 1(bridge_slave_0) entered blocking state [ 38.171477] bridge0: port 1(bridge_slave_0) entered disabled state [ 38.181696] device bridge_slave_0 entered promiscuous mode [ 38.214077] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 38.241258] bridge0: port 2(bridge_slave_1) entered blocking state [ 38.248082] bridge0: port 2(bridge_slave_1) entered disabled state [ 38.256525] device bridge_slave_1 entered promiscuous mode [ 38.355891] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 38.363333] bridge0: port 1(bridge_slave_0) entered blocking state [ 38.370182] bridge0: port 1(bridge_slave_0) entered disabled state [ 38.378861] device bridge_slave_0 entered promiscuous mode [ 38.411138] chnl_net:caif_netlink_parms(): no params data found [ 38.442136] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 38.449487] bridge0: port 2(bridge_slave_1) entered blocking state [ 38.456048] bridge0: port 2(bridge_slave_1) entered disabled state [ 38.464938] device bridge_slave_1 entered promiscuous mode [ 38.473743] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 38.547772] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 38.629384] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 38.638558] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 38.661769] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 38.785284] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 38.906221] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 38.913610] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 39.032588] chnl_net:caif_netlink_parms(): no params data found [ 39.047017] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 39.072699] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.079245] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.088236] device bridge_slave_0 entered promiscuous mode [ 39.113053] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 39.146201] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.152596] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.161503] device bridge_slave_1 entered promiscuous mode [ 39.363489] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 39.372403] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 39.381721] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 39.400634] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 39.409217] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 39.417027] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 39.543189] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 39.595133] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 39.602818] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 39.795466] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.801867] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.811071] device bridge_slave_0 entered promiscuous mode [ 39.847697] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.854076] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.863105] device bridge_slave_1 entered promiscuous mode [ 39.888452] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 39.947863] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 39.958289] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 39.990843] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 40.041448] ------------[ cut here ]------------ [ 40.046469] WARNING: CPU: 1 PID: 5910 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 40.054252] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 40.061346] Kernel panic - not syncing: panic_on_warn set ... [ 40.061346] [ 40.068720] CPU: 1 PID: 5910 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 40.076231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.085591] 0000000000000000 ffff8800b9d16fc8 ffffffff82e18b12 ffffffff85e81040 [ 40.093628] ffff8800b9d170a0 ffffffff85f2bc00 ffffffff8191bd7b 0000000000000009 [ 40.101636] ffff8800b9d17090 ffffffff8160d884 0000000041b58ab3 ffffffff86b4158a [ 40.110374] Call Trace: [ 40.112935] [] dump_stack+0x136/0x1d4 [ 40.118371] [] ? sysfs_warn_dup+0x7b/0xa0 [ 40.124142] [] panic+0x1af/0x348 [ 40.129136] [] ? to_vmem_altmap+0x125/0x125 [ 40.135101] [] ? sysfs_warn_dup+0x7b/0xa0 [ 40.140887] [] __warn+0x18d/0x1b0 [ 40.145966] [] warn_slowpath_fmt+0x92/0xb0 [ 40.151821] [] ? __warn+0x1b0/0x1b0 [ 40.157074] [] ? kernfs_path_from_node+0x4a/0x60 [ 40.163472] [] sysfs_warn_dup+0x7b/0xa0 [ 40.169085] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 40.176096] [] sysfs_create_link+0x43/0xb0 [ 40.181979] [] device_add+0x677/0x1350 [ 40.187506] [] ? device_private_init+0x180/0x180 [ 40.193898] [] ? kfree_const+0x1d/0x20 [ 40.199511] [] ? kobject_set_name_vargs+0xb4/0x130 [ 40.206088] [] device_create_groups_vargs+0x1c8/0x220 [ 40.212914] [] device_create+0x88/0xa0 [ 40.218424] [] ? device_create_vargs+0x20/0x20 [ 40.224650] [] ? macvlan_set_mac_address+0x150/0x150 [ 40.231397] [] macvtap_device_event+0x1c4/0x2a0 [ 40.237705] [] notifier_call_chain+0x8b/0x170 [ 40.243837] [] raw_notifier_call_chain+0x11/0x20 [ 40.250230] [] call_netdevice_notifiers_info+0x47/0x80 [ 40.257144] [] register_netdevice+0x8e8/0xd00 [ 40.263270] [] ? netdev_change_features+0x80/0x80 [ 40.269734] [] ? dev_get_nest_level+0x10c/0x1a0 [ 40.276043] [] macvlan_common_newlink+0x8b9/0x1090 [ 40.282612] [] macvtap_newlink+0xbf/0x110 [ 40.288386] [] ? __netlink_ns_capable+0xc7/0xf0 [ 40.294692] [] rtnl_newlink+0xd4b/0x1230 [ 40.301078] [] ? rtnl_link_ops_get+0x5d/0x90 [ 40.307124] [] ? rtnl_newlink+0x319/0x1230 [ 40.312989] [] ? find_next_bit+0x15/0x20 [ 40.318703] [] ? rtnl_setlink+0x2f0/0x2f0 [ 40.324549] [] ? cpuacct_css_alloc+0x160/0x160 [ 40.330766] [] ? update_blocked_averages+0x8f7/0x1540 [ 40.338571] [] ? find_busiest_group+0x2510/0x2510 [ 40.345050] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 40.352040] [] ? __netlink_ns_capable+0xc7/0xf0 [ 40.358340] [] rtnetlink_rcv_msg+0x222/0x680 [ 40.364398] [] ? rtnetlink_rcv+0x30/0x30 [ 40.370102] [] ? mutex_lock_nested+0x5fd/0xb30 [ 40.376310] [] ? rtnetlink_rcv+0x16/0x30 [ 40.382013] [] ? netlink_seq_start+0xe0/0xe0 [ 40.388048] [] netlink_rcv_skb+0x242/0x350 [ 40.393906] [] ? rtnetlink_rcv+0x30/0x30 [ 40.399607] [] rtnetlink_rcv+0x25/0x30 [ 40.405207] [] netlink_unicast+0x3da/0x560 [ 40.411066] [] ? netlink_sendskb+0x40/0x40 [ 40.416927] [] netlink_sendmsg+0x9bb/0xb40 [ 40.422818] [] ? nlmsg_notify+0xf0/0xf0 [ 40.428866] [] ? __might_fault+0xf1/0x1b0 [ 40.434644] [] ? security_socket_sendmsg+0x6a/0xa0 [ 40.441212] [] ? nlmsg_notify+0xf0/0xf0 [ 40.446813] [] sock_sendmsg+0xb5/0xf0 [ 40.452246] [] SyS_sendto+0x1ca/0x290 [ 40.457680] [] ? SyS_getpeername+0x240/0x240 [ 40.463742] [] ? kmem_cache_free+0x312/0x430 [ 40.469780] [] ? mntput_no_expire+0xce/0x600 [ 40.475816] [] ? mnt_get_count+0x1c0/0x1c0 [ 40.481695] [] ? mntput+0x52/0x70 [ 40.486783] [] ? task_work_run+0x14a/0x200 [ 40.492676] [] ? trace_hardirqs_off+0xd/0x10 [ 40.498728] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 40.505295] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 40.511850] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 40.519542] Kernel Offset: disabled