[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 33.123262] IPVS: Creating netns size=2712 id=1 [ 33.128077] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. 2020/07/24 08:41:31 parsed 1 programs 2020/07/24 08:41:31 executed programs: 0 [ 41.323706] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 41.346635] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 41.367951] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 41.369256] IPVS: Creating netns size=2712 id=2 [ 41.369431] IPVS: ftp: loaded support on port[0] = 21 [ 41.386316] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 41.401888] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 41.410577] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 41.473181] IPVS: Creating netns size=2712 id=3 [ 41.477994] IPVS: ftp: loaded support on port[0] = 21 [ 41.615529] chnl_net:caif_netlink_parms(): no params data found [ 41.646724] IPVS: Creating netns size=2712 id=4 [ 41.651850] IPVS: ftp: loaded support on port[0] = 21 [ 41.840186] chnl_net:caif_netlink_parms(): no params data found [ 41.854373] IPVS: Creating netns size=2712 id=5 [ 41.867844] IPVS: ftp: loaded support on port[0] = 21 [ 42.049401] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.057258] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.067423] device bridge_slave_0 entered promiscuous mode [ 42.097294] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.104404] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.113705] device bridge_slave_1 entered promiscuous mode [ 42.170809] IPVS: Creating netns size=2712 id=6 [ 42.175614] IPVS: ftp: loaded support on port[0] = 21 [ 42.202254] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.243791] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.262024] chnl_net:caif_netlink_parms(): no params data found [ 42.436571] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.444714] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.453974] device bridge_slave_0 entered promiscuous mode [ 42.496352] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.503145] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.512437] device bridge_slave_1 entered promiscuous mode [ 42.587418] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 42.603713] chnl_net:caif_netlink_parms(): no params data found [ 42.637200] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 42.663050] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.671962] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.673926] IPVS: Creating netns size=2712 id=7 [ 42.674043] IPVS: ftp: loaded support on port[0] = 21 [ 42.709006] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.724167] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.993715] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.011632] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.017975] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.026840] device bridge_slave_0 entered promiscuous mode [ 43.043092] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.073866] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.080301] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.088668] device bridge_slave_1 entered promiscuous mode [ 43.171011] chnl_net:caif_netlink_parms(): no params data found [ 43.293259] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.313751] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.320972] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.327318] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.336476] device bridge_slave_0 entered promiscuous mode [ 43.365004] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.402091] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.409985] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.416321] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.425157] device bridge_slave_1 entered promiscuous mode [ 43.588041] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.660867] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.749082] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.820331] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.886710] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.895354] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.903431] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.911164] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.920149] device bridge_slave_0 entered promiscuous mode [ 43.991747] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.998197] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.008195] device bridge_slave_1 entered promiscuous mode [ 44.116314] chnl_net:caif_netlink_parms(): no params data found [ 44.184705] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.196870] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.244996] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.254314] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.344325] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.357620] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.390950] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.662831] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.670574] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.683567] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.690597] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.699864] device bridge_slave_0 entered promiscuous mode [ 44.716989] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.724788] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.747101] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.755287] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.763123] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.772125] device bridge_slave_1 entered promiscuous mode [ 44.887146] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.929504] ------------[ cut here ]------------ [ 44.934251] WARNING: CPU: 0 PID: 5911 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 44.942059] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 44.949686] Kernel panic - not syncing: panic_on_warn set ... [ 44.949686] [ 44.957024] CPU: 0 PID: 5911 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0 [ 44.964523] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.973853] 0000000000000000 ffff8800ba32efc8 ffffffff82c65e52 ffffffff85c81040 [ 44.981863] ffff8800ba32f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 44.989863] ffff8800ba32f090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3a9a [ 44.997866] Call Trace: [ 45.000428] [] dump_stack+0x136/0x1d4 [ 45.005850] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.011628] [] panic+0x1af/0x348 [ 45.016612] [] ? to_vmem_altmap+0x125/0x125 [ 45.022551] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.028323] [] __warn+0x18d/0x1b0 [ 45.033402] [] warn_slowpath_fmt+0x92/0xb0 [ 45.039262] [] ? __warn+0x1b0/0x1b0 [ 45.044519] [] ? kernfs_path_from_node+0x4a/0x60 [ 45.050894] [] sysfs_warn_dup+0x7b/0xa0 [ 45.056483] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 45.063465] [] sysfs_create_link+0x43/0xb0 [ 45.069335] [] device_add+0x677/0x1350 [ 45.074841] [] ? device_private_init+0x180/0x180 [ 45.081229] [] ? kfree_const+0x1d/0x20 [ 45.086745] [] ? kobject_set_name_vargs+0xb4/0x130 [ 45.093301] [] device_create_groups_vargs+0x1c8/0x220 [ 45.100115] [] device_create+0x88/0xa0 [ 45.105619] [] ? device_create_vargs+0x20/0x20 [ 45.111820] [] ? macvlan_set_mac_address+0x150/0x150 [ 45.118564] [] macvtap_device_event+0x1c4/0x2a0 [ 45.124869] [] notifier_call_chain+0x8b/0x170 [ 45.130994] [] raw_notifier_call_chain+0x11/0x20 [ 45.137378] [] call_netdevice_notifiers_info+0x47/0x80 [ 45.144273] [] register_netdevice+0x8e8/0xd00 [ 45.150400] [] ? netdev_change_features+0x80/0x80 [ 45.156863] [] ? dev_get_nest_level+0x10c/0x1a0 [ 45.163151] [] macvlan_common_newlink+0x8b9/0x1090 [ 45.169698] [] macvtap_newlink+0xbf/0x110 [ 45.175475] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.181763] [] rtnl_newlink+0xd4b/0x1230 [ 45.187441] [] ? rtnl_link_ops_get+0x5d/0x90 [ 45.193469] [] ? rtnl_newlink+0x319/0x1230 [ 45.199324] [] ? schedule_preempt_disabled+0x13/0x20 [ 45.206041] [] ? rtnl_setlink+0x2f0/0x2f0 [ 45.211818] [] ? netlink_sendmsg+0x9bb/0xb40 [ 45.217844] [] ? sock_sendmsg+0xb5/0xf0 [ 45.223436] [] ? SyS_sendto+0x1ca/0x290 [ 45.229044] [] ? entry_SYSCALL_64_fastpath+0x23/0xc1 [ 45.235775] [] ? debug_check_no_obj_freed+0x154/0x780 [ 45.242584] [] ? debug_check_no_obj_freed+0x48b/0x780 [ 45.249393] [] ? mark_held_locks+0xc8/0x120 [ 45.255331] [] ? free_pages_prepare+0x7b6/0xf00 [ 45.261618] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.267916] [] rtnetlink_rcv_msg+0x222/0x680 [ 45.273944] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 45.280751] [] ? rtnetlink_rcv+0x30/0x30 [ 45.286442] [] ? mutex_lock_nested+0x5fd/0xb30 [ 45.292643] [] ? rtnetlink_rcv+0x16/0x30 [ 45.298325] [] ? netlink_seq_start+0xe0/0xe0 [ 45.304355] [] netlink_rcv_skb+0x242/0x350 [ 45.310207] [] ? rtnetlink_rcv+0x30/0x30 [ 45.315884] [] rtnetlink_rcv+0x25/0x30 [ 45.321388] [] netlink_unicast+0x3da/0x560 [ 45.327239] [] ? netlink_sendskb+0x40/0x40 [ 45.333090] [] netlink_sendmsg+0x9bb/0xb40 [ 45.338942] [] ? nlmsg_notify+0xf0/0xf0 [ 45.344538] [] ? __might_fault+0xf1/0x1b0 [ 45.350304] [] ? nlmsg_notify+0xf0/0xf0 [ 45.355900] [] sock_sendmsg+0xb5/0xf0 [ 45.361318] [] SyS_sendto+0x1ca/0x290 [ 45.366735] [] ? SyS_getpeername+0x240/0x240 [ 45.372761] [] ? mntput_no_expire+0xce/0x600 [ 45.378786] [] ? mnt_get_count+0x1c0/0x1c0 [ 45.384636] [] ? mntput+0x52/0x70 [ 45.389709] [] ? task_work_run+0x14a/0x200 [ 45.395562] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 45.402381] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 45.408943] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 45.416561] Kernel Offset: disabled