[ 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: [ 34.270601] IPVS: Creating netns size=2712 id=1 [ 34.275516] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.173' (ECDSA) to the list of known hosts. 2020/07/26 01:21:24 parsed 1 programs 2020/07/26 01:21:24 executed programs: 0 [ 42.324611] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 42.339534] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 42.348275] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 42.356417] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 42.364246] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 42.372129] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 42.388911] IPVS: Creating netns size=2712 id=2 [ 42.393756] IPVS: ftp: loaded support on port[0] = 21 [ 42.460887] IPVS: Creating netns size=2712 id=3 [ 42.465734] IPVS: ftp: loaded support on port[0] = 21 [ 42.598598] chnl_net:caif_netlink_parms(): no params data found [ 42.633913] IPVS: Creating netns size=2712 id=4 [ 42.638667] IPVS: ftp: loaded support on port[0] = 21 [ 42.795367] chnl_net:caif_netlink_parms(): no params data found [ 42.839520] IPVS: Creating netns size=2712 id=5 [ 42.852393] IPVS: ftp: loaded support on port[0] = 21 [ 42.921556] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.928092] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.937073] device bridge_slave_0 entered promiscuous mode [ 42.963994] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.971040] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.979421] device bridge_slave_1 entered promiscuous mode [ 43.082909] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.156957] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.176089] IPVS: Creating netns size=2712 id=6 [ 43.187991] IPVS: ftp: loaded support on port[0] = 21 [ 43.376127] chnl_net:caif_netlink_parms(): no params data found [ 43.392056] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.398436] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.407992] device bridge_slave_0 entered promiscuous mode [ 43.473807] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.480301] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.488703] device bridge_slave_1 entered promiscuous mode [ 43.521127] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.559237] chnl_net:caif_netlink_parms(): no params data found [ 43.573947] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.607240] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.618730] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.629753] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.644757] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.718435] IPVS: Creating netns size=2712 id=7 [ 43.724850] IPVS: ftp: loaded support on port[0] = 21 [ 43.784661] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.838919] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.025143] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.035054] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.046946] device bridge_slave_0 entered promiscuous mode [ 44.124465] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.131122] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.141614] device bridge_slave_1 entered promiscuous mode [ 44.165882] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.230650] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.311431] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.317834] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.327067] device bridge_slave_0 entered promiscuous mode [ 44.336859] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.373980] chnl_net:caif_netlink_parms(): no params data found [ 44.407225] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.413722] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.423047] device bridge_slave_1 entered promiscuous mode [ 44.432741] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.602466] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.616024] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.628183] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.641880] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.837552] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.870948] chnl_net:caif_netlink_parms(): no params data found [ 44.953305] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.017502] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.136746] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.197780] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.210930] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.217523] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.226955] device bridge_slave_0 entered promiscuous mode [ 45.234831] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.289975] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.296350] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.306314] device bridge_slave_1 entered promiscuous mode [ 45.313621] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.414210] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.422626] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.473107] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.481887] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.563193] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.569687] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.578233] device bridge_slave_0 entered promiscuous mode [ 45.628080] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.634953] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.644424] device bridge_slave_1 entered promiscuous mode [ 45.781129] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 45.852926] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.865054] 8021q: adding VLAN 0 to HW filter on device bond0 [ 45.901078] ------------[ cut here ]------------ [ 45.905848] WARNING: CPU: 0 PID: 5897 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 45.913706] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 45.920765] Kernel panic - not syncing: panic_on_warn set ... [ 45.920765] [ 45.928123] CPU: 0 PID: 5897 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0 [ 45.935638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.944965] 0000000000000000 ffff8800b9e3efc8 ffffffff82c65e52 ffffffff85c81040 [ 45.953007] ffff8800b9e3f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 45.961011] ffff8800b9e3f090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3a9a [ 45.969009] Call Trace: [ 45.971576] [] dump_stack+0x136/0x1d4 [ 45.976999] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.982788] [] panic+0x1af/0x348 [ 45.987774] [] ? to_vmem_altmap+0x125/0x125 [ 45.993728] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.999502] [] __warn+0x18d/0x1b0 [ 46.004601] [] warn_slowpath_fmt+0x92/0xb0 [ 46.010457] [] ? __warn+0x1b0/0x1b0 [ 46.015705] [] ? kernfs_path_from_node+0x4a/0x60 [ 46.022091] [] sysfs_warn_dup+0x7b/0xa0 [ 46.027683] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 46.034680] [] sysfs_create_link+0x43/0xb0 [ 46.040537] [] device_add+0x677/0x1350 [ 46.046043] [] ? device_private_init+0x180/0x180 [ 46.052430] [] ? kfree_const+0x1d/0x20 [ 46.057948] [] ? kobject_set_name_vargs+0xb4/0x130 [ 46.064498] [] device_create_groups_vargs+0x1c8/0x220 [ 46.071322] [] device_create+0x88/0xa0 [ 46.076827] [] ? device_create_vargs+0x20/0x20 [ 46.083027] [] ? macvlan_set_mac_address+0x150/0x150 [ 46.089764] [] macvtap_device_event+0x1c4/0x2a0 [ 46.096065] [] notifier_call_chain+0x8b/0x170 [ 46.102192] [] raw_notifier_call_chain+0x11/0x20 [ 46.108572] [] call_netdevice_notifiers_info+0x47/0x80 [ 46.115473] [] register_netdevice+0x8e8/0xd00 [ 46.121603] [] ? netdev_change_features+0x80/0x80 [ 46.128067] [] ? dev_get_nest_level+0x10c/0x1a0 [ 46.134377] [] macvlan_common_newlink+0x8b9/0x1090 [ 46.140926] [] macvtap_newlink+0xbf/0x110 [ 46.146692] [] ? __netlink_ns_capable+0xc7/0xf0 [ 46.152983] [] rtnl_newlink+0xd4b/0x1230 [ 46.158669] [] ? rtnl_link_ops_get+0x5d/0x90 [ 46.164703] [] ? rtnl_newlink+0x319/0x1230 [ 46.170576] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 46.177313] [] ? rtnl_setlink+0x2f0/0x2f0 [ 46.183095] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 46.189818] [] ? __lock_acquire+0x15c3/0x5990 [ 46.195948] [] ? cpuacct_charge+0x189/0x300 [ 46.201889] [] ? cpuacct_css_alloc+0x160/0x160 [ 46.208106] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 46.215108] [] ? __netlink_ns_capable+0xc7/0xf0 [ 46.221395] [] rtnetlink_rcv_msg+0x222/0x680 [ 46.227445] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 46.234260] [] ? rtnetlink_rcv+0x30/0x30 [ 46.239942] [] ? mutex_lock_nested+0x5fd/0xb30 [ 46.246142] [] ? rtnetlink_rcv+0x16/0x30 [ 46.251840] [] ? netlink_seq_start+0xe0/0xe0 [ 46.257877] [] netlink_rcv_skb+0x242/0x350 [ 46.263767] [] ? rtnetlink_rcv+0x30/0x30 [ 46.269476] [] rtnetlink_rcv+0x25/0x30 [ 46.274993] [] netlink_unicast+0x3da/0x560 [ 46.280855] [] ? netlink_sendskb+0x40/0x40 [ 46.286711] [] netlink_sendmsg+0x9bb/0xb40 [ 46.292566] [] ? nlmsg_notify+0xf0/0xf0 [ 46.298179] [] ? __might_fault+0xf1/0x1b0 [ 46.303956] [] ? nlmsg_notify+0xf0/0xf0 [ 46.309566] [] sock_sendmsg+0xb5/0xf0 [ 46.314988] [] SyS_sendto+0x1ca/0x290 [ 46.320409] [] ? SyS_getpeername+0x240/0x240 [ 46.326557] [] ? mntput_no_expire+0xce/0x600 [ 46.332585] [] ? mnt_get_count+0x1c0/0x1c0 [ 46.338444] [] ? mntput+0x52/0x70 [ 46.343528] [] ? task_work_run+0x14a/0x200 [ 46.349395] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 46.356205] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 46.362758] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 46.370418] Kernel Offset: disabled