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: [ 28.655178] sshd (5674) used greatest stack depth: 24768 bytes left [ 35.390135] IPVS: Creating netns size=2712 id=1 [ 35.395724] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.1.44' (ECDSA) to the list of known hosts. 2020/06/07 10:02:17 parsed 1 programs 2020/06/07 10:02:17 executed programs: 0 [ 43.489568] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 43.502198] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 43.511427] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 43.520270] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 43.528686] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 43.536943] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 43.555820] IPVS: Creating netns size=2712 id=2 [ 43.561042] IPVS: ftp: loaded support on port[0] = 21 [ 43.639080] IPVS: Creating netns size=2712 id=3 [ 43.645038] IPVS: ftp: loaded support on port[0] = 21 [ 43.796722] chnl_net:caif_netlink_parms(): no params data found [ 43.844090] IPVS: Creating netns size=2712 id=4 [ 43.848977] IPVS: ftp: loaded support on port[0] = 21 [ 44.060956] chnl_net:caif_netlink_parms(): no params data found [ 44.069507] IPVS: Creating netns size=2712 id=5 [ 44.084087] IPVS: ftp: loaded support on port[0] = 21 [ 44.312165] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.319186] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.328674] device bridge_slave_0 entered promiscuous mode [ 44.337826] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.344849] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.355195] device bridge_slave_1 entered promiscuous mode [ 44.445097] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.454031] chnl_net:caif_netlink_parms(): no params data found [ 44.490530] IPVS: Creating netns size=2712 id=6 [ 44.496439] IPVS: ftp: loaded support on port[0] = 21 [ 44.539501] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.562557] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.569233] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.578860] device bridge_slave_0 entered promiscuous mode [ 44.624555] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.630935] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.640863] device bridge_slave_1 entered promiscuous mode [ 44.770431] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.907229] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.992532] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.027328] chnl_net:caif_netlink_parms(): no params data found [ 45.065047] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.073926] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.107650] IPVS: Creating netns size=2712 id=7 [ 45.113151] IPVS: ftp: loaded support on port[0] = 21 [ 45.133919] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.226633] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.233368] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.242152] device bridge_slave_0 entered promiscuous mode [ 45.330973] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.337611] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.347475] device bridge_slave_1 entered promiscuous mode [ 45.434663] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.445466] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.469393] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.484256] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 45.495106] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.539224] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.902642] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.909038] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.919399] device bridge_slave_0 entered promiscuous mode [ 45.927748] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.964700] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.971169] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.980718] device bridge_slave_1 entered promiscuous mode [ 45.988119] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.010956] chnl_net:caif_netlink_parms(): no params data found [ 46.070169] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.126833] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.165794] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.262635] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.456861] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.465869] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.604687] chnl_net:caif_netlink_parms(): no params data found [ 46.879407] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.886557] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.896256] device bridge_slave_0 entered promiscuous mode [ 46.915327] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.955167] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.962073] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.970832] device bridge_slave_1 entered promiscuous mode [ 47.018251] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.077142] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 47.142530] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.155625] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.179103] ------------[ cut here ]------------ [ 47.183913] WARNING: CPU: 0 PID: 5869 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 47.192726] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 47.199763] Kernel panic - not syncing: panic_on_warn set ... [ 47.199763] [ 47.207123] CPU: 0 PID: 5869 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0 [ 47.214649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.224441] 0000000000000000 ffff8800b1cf6fc8 ffffffff82c65e52 ffffffff85c81040 [ 47.232490] ffff8800b1cf70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 47.240755] ffff8800b1cf7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f05e2 [ 47.248872] Call Trace: [ 47.251442] [] dump_stack+0x136/0x1d4 [ 47.256882] [] ? sysfs_warn_dup+0x7b/0xa0 [ 47.262659] [] panic+0x1af/0x348 [ 47.267647] [] ? to_vmem_altmap+0x125/0x125 [ 47.273608] [] ? sysfs_warn_dup+0x7b/0xa0 [ 47.279378] [] __warn+0x18d/0x1b0 [ 47.284476] [] warn_slowpath_fmt+0x92/0xb0 [ 47.290335] [] ? __warn+0x1b0/0x1b0 [ 47.295596] [] ? kernfs_path_from_node+0x4a/0x60 [ 47.301991] [] sysfs_warn_dup+0x7b/0xa0 [ 47.308821] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 47.316264] [] sysfs_create_link+0x43/0xb0 [ 47.322138] [] device_add+0x677/0x1350 [ 47.327747] [] ? device_private_init+0x180/0x180 [ 47.334128] [] ? kfree_const+0x1d/0x20 [ 47.339640] [] ? kobject_set_name_vargs+0xb4/0x130 [ 47.346322] [] device_create_groups_vargs+0x1c8/0x220 [ 47.353152] [] device_create+0x88/0xa0 [ 47.358845] [] ? device_create_vargs+0x20/0x20 [ 47.365060] [] ? macvlan_set_mac_address+0x150/0x150 [ 47.371901] [] macvtap_device_event+0x1c4/0x2a0 [ 47.378307] [] notifier_call_chain+0x8b/0x170 [ 47.384571] [] raw_notifier_call_chain+0x11/0x20 [ 47.390968] [] call_netdevice_notifiers_info+0x47/0x80 [ 47.397892] [] register_netdevice+0x8e8/0xd00 [ 47.404020] [] ? netdev_change_features+0x80/0x80 [ 47.410507] [] ? dev_get_nest_level+0x10c/0x1a0 [ 47.416993] [] macvlan_common_newlink+0x8b9/0x1090 [ 47.423546] [] macvtap_newlink+0xbf/0x110 [ 47.429634] [] ? __netlink_ns_capable+0xc7/0xf0 [ 47.435959] [] rtnl_newlink+0xd4b/0x1230 [ 47.441748] [] ? rtnl_link_ops_get+0x5d/0x90 [ 47.448235] [] ? rtnl_newlink+0x319/0x1230 [ 47.454126] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 47.460853] [] ? rtnl_setlink+0x2f0/0x2f0 [ 47.466644] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 47.473384] [] ? __lock_acquire+0x15c3/0x5990 [ 47.479525] [] ? cpuacct_charge+0x189/0x300 [ 47.485580] [] ? cpuacct_css_alloc+0x160/0x160 [ 47.491799] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 47.498906] [] ? __netlink_ns_capable+0xc7/0xf0 [ 47.505211] [] rtnetlink_rcv_msg+0x222/0x680 [ 47.511443] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 47.518282] [] ? rtnetlink_rcv+0x30/0x30 [ 47.523970] [] ? mutex_lock_nested+0x5fd/0xb30 [ 47.530315] [] ? rtnetlink_rcv+0x16/0x30 [ 47.536578] [] ? netlink_seq_start+0xe0/0xe0 [ 47.542724] [] netlink_rcv_skb+0x242/0x350 [ 47.548589] [] ? rtnetlink_rcv+0x30/0x30 [ 47.554376] [] rtnetlink_rcv+0x25/0x30 [ 47.559900] [] netlink_unicast+0x3da/0x560 [ 47.565863] [] ? netlink_sendskb+0x40/0x40 [ 47.571808] [] netlink_sendmsg+0x9bb/0xb40 [ 47.577690] [] ? nlmsg_notify+0xf0/0xf0 [ 47.583292] [] ? __might_fault+0xf1/0x1b0 [ 47.589081] [] ? nlmsg_notify+0xf0/0xf0 [ 47.594803] [] sock_sendmsg+0xb5/0xf0 [ 47.600228] [] SyS_sendto+0x1ca/0x290 [ 47.605742] [] ? SyS_getpeername+0x240/0x240 [ 47.611789] [] ? mntput_no_expire+0xce/0x600 [ 47.618082] [] ? mnt_get_count+0x1c0/0x1c0 [ 47.623987] [] ? mntput+0x52/0x70 [ 47.629063] [] ? task_work_run+0x14a/0x200 [ 47.634927] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 47.641741] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 47.648293] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 47.656452] Kernel Offset: disabled