[ 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: [ 32.313843] IPVS: Creating netns size=2712 id=1 [ 32.318799] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. 2020/08/02 03:39:10 parsed 1 programs 2020/08/02 03:39:10 executed programs: 0 [ 40.412848] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 40.423217] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 40.434820] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 40.442617] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 40.451088] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 40.459510] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 40.477337] IPVS: Creating netns size=2712 id=2 [ 40.482058] IPVS: ftp: loaded support on port[0] = 21 [ 40.560486] IPVS: Creating netns size=2712 id=3 [ 40.565308] IPVS: ftp: loaded support on port[0] = 21 [ 40.728434] IPVS: Creating netns size=2712 id=4 [ 40.733365] IPVS: ftp: loaded support on port[0] = 21 [ 40.749756] chnl_net:caif_netlink_parms(): no params data found [ 40.968221] IPVS: Creating netns size=2712 id=5 [ 40.973323] IPVS: ftp: loaded support on port[0] = 21 [ 41.000017] chnl_net:caif_netlink_parms(): no params data found [ 41.140549] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.147251] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.157367] device bridge_slave_0 entered promiscuous mode [ 41.204508] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.211104] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.220484] device bridge_slave_1 entered promiscuous mode [ 41.333999] IPVS: Creating netns size=2712 id=6 [ 41.339257] IPVS: ftp: loaded support on port[0] = 21 [ 41.377140] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.406767] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.440745] chnl_net:caif_netlink_parms(): no params data found [ 41.662558] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.671426] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.682083] device bridge_slave_0 entered promiscuous mode [ 41.723509] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.730527] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.739850] device bridge_slave_1 entered promiscuous mode [ 41.824271] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.866838] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.882247] chnl_net:caif_netlink_parms(): no params data found [ 41.909616] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.911780] IPVS: Creating netns size=2712 id=7 [ 41.911899] IPVS: ftp: loaded support on port[0] = 21 [ 41.928309] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 41.948284] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.956635] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.230394] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 42.238170] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.244525] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.253620] device bridge_slave_0 entered promiscuous mode [ 42.375047] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 42.382097] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.389837] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.399611] device bridge_slave_1 entered promiscuous mode [ 42.509937] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.531406] chnl_net:caif_netlink_parms(): no params data found [ 42.550251] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.559773] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.592311] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.801564] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.807998] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.817770] device bridge_slave_0 entered promiscuous mode [ 42.858952] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 42.866359] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.875181] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.884081] device bridge_slave_1 entered promiscuous mode [ 42.928343] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.100400] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.178347] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.291443] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.300737] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.332942] chnl_net:caif_netlink_parms(): no params data found [ 43.458167] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.465275] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.469339] device bridge_slave_0 entered promiscuous mode [ 43.471838] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.471914] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.477145] device bridge_slave_1 entered promiscuous mode [ 43.635788] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.680743] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.689079] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.697217] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.748709] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.831704] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.841855] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.126067] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.135855] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.142378] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.152094] device bridge_slave_0 entered promiscuous mode [ 44.160110] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.166586] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.176421] device bridge_slave_1 entered promiscuous mode [ 44.195354] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.273663] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.305641] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.330511] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.347589] ------------[ cut here ]------------ [ 44.352338] WARNING: CPU: 1 PID: 5881 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 44.360835] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 44.368274] Kernel panic - not syncing: panic_on_warn set ... [ 44.368274] [ 44.375818] CPU: 1 PID: 5881 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 44.383317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.392641] 0000000000000000 ffff8801296eefc8 ffffffff82c65e52 ffffffff85c81040 [ 44.400629] ffff8801296ef0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 44.408604] ffff8801296ef090 ffffffff8160d884 0000000041b58ab3 ffffffff868f8c5a [ 44.416579] Call Trace: [ 44.419138] [] dump_stack+0x136/0x1d4 [ 44.424566] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.430334] [] panic+0x1af/0x348 [ 44.435320] [] ? to_vmem_altmap+0x125/0x125 [ 44.441260] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.447027] [] __warn+0x18d/0x1b0 [ 44.452098] [] warn_slowpath_fmt+0x92/0xb0 [ 44.457952] [] ? __warn+0x1b0/0x1b0 [ 44.463198] [] ? kernfs_path_from_node+0x4a/0x60 [ 44.469572] [] sysfs_warn_dup+0x7b/0xa0 [ 44.475165] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 44.482146] [] sysfs_create_link+0x43/0xb0 [ 44.487999] [] device_add+0x677/0x1350 [ 44.493511] [] ? device_private_init+0x180/0x180 [ 44.499889] [] ? kfree_const+0x1d/0x20 [ 44.505396] [] ? kobject_set_name_vargs+0xb4/0x130 [ 44.511941] [] device_create_groups_vargs+0x1c8/0x220 [ 44.518802] [] device_create+0x88/0xa0 [ 44.524306] [] ? device_create_vargs+0x20/0x20 [ 44.530544] [] ? macvlan_set_mac_address+0x150/0x150 [ 44.537265] [] macvtap_device_event+0x1c4/0x2a0 [ 44.543557] [] notifier_call_chain+0x8b/0x170 [ 44.549674] [] raw_notifier_call_chain+0x11/0x20 [ 44.556060] [] call_netdevice_notifiers_info+0x47/0x80 [ 44.563046] [] register_netdevice+0x8e8/0xd00 [ 44.569165] [] ? netdev_change_features+0x80/0x80 [ 44.575628] [] ? dev_get_nest_level+0x10c/0x1a0 [ 44.581918] [] macvlan_common_newlink+0x8b9/0x1090 [ 44.588543] [] macvtap_newlink+0xbf/0x110 [ 44.594323] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.600611] [] rtnl_newlink+0xd4b/0x1230 [ 44.606290] [] ? rtnl_link_ops_get+0x5d/0x90 [ 44.612316] [] ? rtnl_newlink+0x319/0x1230 [ 44.618175] [] ? find_next_bit+0x15/0x20 [ 44.623861] [] ? rtnl_setlink+0x2f0/0x2f0 [ 44.629631] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 44.636353] [] ? __lock_acquire+0x15c3/0x5990 [ 44.642467] [] ? update_blocked_averages+0x8f7/0x1540 [ 44.649275] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 44.656266] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.662555] [] rtnetlink_rcv_msg+0x222/0x680 [ 44.668582] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 44.675390] [] ? rtnetlink_rcv+0x30/0x30 [ 44.681070] [] ? mutex_lock_nested+0x5fd/0xb30 [ 44.687277] [] ? rtnetlink_rcv+0x16/0x30 [ 44.692957] [] ? netlink_seq_start+0xe0/0xe0 [ 44.698990] [] netlink_rcv_skb+0x242/0x350 [ 44.704841] [] ? rtnetlink_rcv+0x30/0x30 [ 44.710519] [] rtnetlink_rcv+0x25/0x30 [ 44.716026] [] netlink_unicast+0x3da/0x560 [ 44.721879] [] ? netlink_sendskb+0x40/0x40 [ 44.727731] [] netlink_sendmsg+0x9bb/0xb40 [ 44.733588] [] ? nlmsg_notify+0xf0/0xf0 [ 44.739184] [] ? __might_fault+0xf1/0x1b0 [ 44.744951] [] ? nlmsg_notify+0xf0/0xf0 [ 44.750544] [] sock_sendmsg+0xb5/0xf0 [ 44.755960] [] SyS_sendto+0x1ca/0x290 [ 44.761376] [] ? SyS_getpeername+0x240/0x240 [ 44.767576] [] ? mntput_no_expire+0xce/0x600 [ 44.773606] [] ? mnt_get_count+0x1c0/0x1c0 [ 44.779462] [] ? mntput+0x52/0x70 [ 44.784532] [] ? task_work_run+0x14a/0x200 [ 44.790383] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 44.797193] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 44.803747] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 44.811689] Kernel Offset: disabled