[ 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: [ 36.212555] IPVS: Creating netns size=2712 id=1 [ 36.217578] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. 2020/05/11 07:16:30 parsed 1 programs 2020/05/11 07:16:30 executed programs: 0 [ 44.301790] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 44.325540] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 44.334900] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 44.343121] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 44.356484] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 44.366730] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 44.367429] IPVS: Creating netns size=2712 id=2 [ 44.367556] IPVS: ftp: loaded support on port[0] = 21 [ 44.454767] IPVS: Creating netns size=2712 id=3 [ 44.459603] IPVS: ftp: loaded support on port[0] = 21 [ 44.626030] chnl_net:caif_netlink_parms(): no params data found [ 44.636703] IPVS: Creating netns size=2712 id=4 [ 44.641548] IPVS: ftp: loaded support on port[0] = 21 [ 44.842216] chnl_net:caif_netlink_parms(): no params data found [ 44.892621] IPVS: Creating netns size=2712 id=5 [ 44.904500] IPVS: ftp: loaded support on port[0] = 21 [ 45.019742] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.027303] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.037468] device bridge_slave_0 entered promiscuous mode [ 45.067958] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.075407] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.085249] device bridge_slave_1 entered promiscuous mode [ 45.196456] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.296742] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.305306] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.311795] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.320986] device bridge_slave_0 entered promiscuous mode [ 45.351840] IPVS: Creating netns size=2712 id=6 [ 45.357883] IPVS: ftp: loaded support on port[0] = 21 [ 45.377016] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.384097] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.393827] device bridge_slave_1 entered promiscuous mode [ 45.468449] chnl_net:caif_netlink_parms(): no params data found [ 45.535244] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.624185] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.665769] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.787894] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.798274] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.828515] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.934857] IPVS: Creating netns size=2712 id=7 [ 45.940538] IPVS: ftp: loaded support on port[0] = 21 [ 46.007504] chnl_net:caif_netlink_parms(): no params data found [ 46.034197] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.078312] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.101279] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.172273] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.179736] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.187350] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.197142] device bridge_slave_0 entered promiscuous mode [ 46.280348] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.287764] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.299332] device bridge_slave_1 entered promiscuous mode [ 46.502288] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.520168] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.527737] chnl_net:caif_netlink_parms(): no params data found [ 46.556992] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.598290] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.887870] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.896022] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.906211] device bridge_slave_0 entered promiscuous mode [ 46.975897] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.982454] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.991233] device bridge_slave_1 entered promiscuous mode [ 47.078761] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.141027] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.183036] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.227869] chnl_net:caif_netlink_parms(): no params data found [ 47.260707] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.469806] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.536073] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.543439] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.552811] device bridge_slave_0 entered promiscuous mode [ 47.560280] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.608071] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.615251] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.626230] device bridge_slave_1 entered promiscuous mode [ 47.668867] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 47.772910] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.784168] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.795172] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 47.824826] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.833171] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.014755] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.021299] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.032065] device bridge_slave_0 entered promiscuous mode [ 48.055019] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.061472] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.073842] device bridge_slave_1 entered promiscuous mode [ 48.124421] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.217241] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.265439] ------------[ cut here ]------------ [ 48.270367] WARNING: CPU: 0 PID: 5866 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 48.279119] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 48.286758] Kernel panic - not syncing: panic_on_warn set ... [ 48.286758] [ 48.294111] CPU: 0 PID: 5866 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 48.301617] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.310986] 0000000000000000 ffff8800ba32efc8 ffffffff82c65932 ffffffff85c81040 [ 48.319025] ffff8800ba32f0a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009 [ 48.327050] ffff8800ba32f090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a [ 48.336130] Call Trace: [ 48.338693] [] dump_stack+0x136/0x1d4 [ 48.344137] [] ? sysfs_warn_dup+0x7b/0xa0 [ 48.349913] [] panic+0x1af/0x348 [ 48.354902] [] ? to_vmem_altmap+0x125/0x125 [ 48.360960] [] ? sysfs_warn_dup+0x7b/0xa0 [ 48.366737] [] __warn+0x18d/0x1b0 [ 48.371832] [] warn_slowpath_fmt+0x92/0xb0 [ 48.377752] [] ? __warn+0x1b0/0x1b0 [ 48.383010] [] ? kernfs_path_from_node+0x4a/0x60 [ 48.389562] [] sysfs_warn_dup+0x7b/0xa0 [ 48.395160] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 48.402237] [] sysfs_create_link+0x43/0xb0 [ 48.408100] [] device_add+0x677/0x1350 [ 48.413628] [] ? device_private_init+0x180/0x180 [ 48.420007] [] ? kfree_const+0x1d/0x20 [ 48.425519] [] ? kobject_set_name_vargs+0xb4/0x130 [ 48.432093] [] device_create_groups_vargs+0x1c8/0x220 [ 48.438921] [] device_create+0x88/0xa0 [ 48.444434] [] ? device_create_vargs+0x20/0x20 [ 48.450638] [] ? macvlan_set_mac_address+0x150/0x150 [ 48.457455] [] macvtap_device_event+0x1c4/0x2a0 [ 48.463765] [] notifier_call_chain+0x8b/0x170 [ 48.470164] [] raw_notifier_call_chain+0x11/0x20 [ 48.476543] [] call_netdevice_notifiers_info+0x47/0x80 [ 48.483462] [] register_netdevice+0x8e8/0xd00 [ 48.489704] [] ? netdev_change_features+0x80/0x80 [ 48.496174] [] ? dev_get_nest_level+0x10c/0x1a0 [ 48.502493] [] macvlan_common_newlink+0x8b9/0x1090 [ 48.509081] [] macvtap_newlink+0xbf/0x110 [ 48.514860] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.521251] [] rtnl_newlink+0xd4b/0x1230 [ 48.526980] [] ? rtnl_link_ops_get+0x5d/0x90 [ 48.533011] [] ? rtnl_newlink+0x319/0x1230 [ 48.538872] [] ? find_next_bit+0x15/0x20 [ 48.544655] [] ? rtnl_setlink+0x2f0/0x2f0 [ 48.550427] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 48.557157] [] ? __lock_acquire+0x15c3/0x5990 [ 48.563276] [] ? update_blocked_averages+0x8f7/0x1540 [ 48.570368] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 48.577358] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.583649] [] rtnetlink_rcv_msg+0x222/0x680 [ 48.589698] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 48.596603] [] ? rtnetlink_rcv+0x30/0x30 [ 48.602735] [] ? mutex_lock_nested+0x5fd/0xb30 [ 48.608965] [] ? rtnetlink_rcv+0x16/0x30 [ 48.614822] [] ? netlink_seq_start+0xe0/0xe0 [ 48.620893] [] netlink_rcv_skb+0x242/0x350 [ 48.626780] [] ? rtnetlink_rcv+0x30/0x30 [ 48.632473] [] rtnetlink_rcv+0x25/0x30 [ 48.637995] [] netlink_unicast+0x3da/0x560 [ 48.643942] [] ? netlink_sendskb+0x40/0x40 [ 48.649806] [] netlink_sendmsg+0x9bb/0xb40 [ 48.655665] [] ? nlmsg_notify+0xf0/0xf0 [ 48.661264] [] ? __might_fault+0xf1/0x1b0 [ 48.667052] [] ? nlmsg_notify+0xf0/0xf0 [ 48.672796] [] sock_sendmsg+0xb5/0xf0 [ 48.678227] [] SyS_sendto+0x1ca/0x290 [ 48.683689] [] ? SyS_getpeername+0x240/0x240 [ 48.689732] [] ? mntput_no_expire+0xce/0x600 [ 48.695779] [] ? mnt_get_count+0x1c0/0x1c0 [ 48.701639] [] ? mntput+0x52/0x70 [ 48.706985] [] ? task_work_run+0x14a/0x200 [ 48.713033] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 48.719943] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 48.726767] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 48.734171] Kernel Offset: disabled