[ 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: [ 36.642274] IPVS: Creating netns size=2712 id=1 [ 36.647203] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.1.47' (ECDSA) to the list of known hosts. 2020/04/19 11:19:37 parsed 1 programs 2020/04/19 11:19:37 executed programs: 0 [ 45.296290] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 45.309478] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 45.318997] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 45.327645] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 45.335442] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 45.343268] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 45.361554] IPVS: Creating netns size=2712 id=2 [ 45.366488] IPVS: ftp: loaded support on port[0] = 21 [ 45.443914] IPVS: Creating netns size=2712 id=3 [ 45.449857] IPVS: ftp: loaded support on port[0] = 21 [ 45.603165] chnl_net:caif_netlink_parms(): no params data found [ 45.639729] IPVS: Creating netns size=2712 id=4 [ 45.644565] IPVS: ftp: loaded support on port[0] = 21 [ 45.867880] chnl_net:caif_netlink_parms(): no params data found [ 45.879244] IPVS: Creating netns size=2712 id=5 [ 45.884112] IPVS: ftp: loaded support on port[0] = 21 [ 46.081933] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.088962] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.098767] device bridge_slave_0 entered promiscuous mode [ 46.123156] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.130380] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.140029] device bridge_slave_1 entered promiscuous mode [ 46.202138] chnl_net:caif_netlink_parms(): no params data found [ 46.253926] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.268670] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.351431] IPVS: Creating netns size=2712 id=6 [ 46.364140] IPVS: ftp: loaded support on port[0] = 21 [ 46.504364] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 46.513415] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.520920] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.530502] device bridge_slave_0 entered promiscuous mode [ 46.573701] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 46.581952] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.588816] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.598310] device bridge_slave_1 entered promiscuous mode [ 46.669798] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.680036] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.758178] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.771917] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.883057] IPVS: Creating netns size=2712 id=7 [ 46.888609] IPVS: ftp: loaded support on port[0] = 21 [ 46.977462] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.983977] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.993893] device bridge_slave_0 entered promiscuous mode [ 47.002095] chnl_net:caif_netlink_parms(): no params data found [ 47.032018] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.039294] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.048968] device bridge_slave_1 entered promiscuous mode [ 47.056807] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.153930] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.277667] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.347112] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.464261] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.472624] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.634560] chnl_net:caif_netlink_parms(): no params data found [ 47.783729] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.842605] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.850003] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.859903] device bridge_slave_0 entered promiscuous mode [ 47.868243] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.929669] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.936909] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.947538] device bridge_slave_1 entered promiscuous mode [ 48.003020] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.051408] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.123728] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.133375] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.358772] chnl_net:caif_netlink_parms(): no params data found [ 48.428021] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 48.455206] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.516552] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.570141] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.577486] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.587966] device bridge_slave_0 entered promiscuous mode [ 48.634204] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.643868] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.673365] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.680648] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.690599] device bridge_slave_1 entered promiscuous mode [ 48.853018] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.875722] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.883323] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.916419] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 49.021076] bridge0: port 1(bridge_slave_0) entered blocking state [ 49.028237] bridge0: port 1(bridge_slave_0) entered disabled state [ 49.038324] device bridge_slave_0 entered promiscuous mode [ 49.118883] bridge0: port 2(bridge_slave_1) entered blocking state [ 49.126125] bridge0: port 2(bridge_slave_1) entered disabled state [ 49.135975] device bridge_slave_1 entered promiscuous mode [ 49.278660] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 49.359496] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 49.383875] 8021q: adding VLAN 0 to HW filter on device bond0 [ 49.400714] ------------[ cut here ]------------ [ 49.405678] WARNING: CPU: 0 PID: 5908 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 49.413704] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 49.421635] Kernel panic - not syncing: panic_on_warn set ... [ 49.421635] [ 49.429063] CPU: 0 PID: 5908 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 49.436683] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.448753] 0000000000000000 ffff8800b992efc8 ffffffff82c65932 ffffffff85c81040 [ 49.456966] ffff8800b992f0a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009 [ 49.465076] ffff8800b992f090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a [ 49.473342] Call Trace: [ 49.475919] [] dump_stack+0x136/0x1d4 [ 49.481369] [] ? sysfs_warn_dup+0x7b/0xa0 [ 49.487147] [] panic+0x1af/0x348 [ 49.492140] [] ? to_vmem_altmap+0x125/0x125 [ 49.498596] [] ? sysfs_warn_dup+0x7b/0xa0 [ 49.504374] [] __warn+0x18d/0x1b0 [ 49.509508] [] warn_slowpath_fmt+0x92/0xb0 [ 49.515418] [] ? __warn+0x1b0/0x1b0 [ 49.520673] [] ? kernfs_path_from_node+0x4a/0x60 [ 49.527057] [] sysfs_warn_dup+0x7b/0xa0 [ 49.532758] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 49.539745] [] sysfs_create_link+0x43/0xb0 [ 49.545618] [] device_add+0x677/0x1350 [ 49.551158] [] ? device_private_init+0x180/0x180 [ 49.557541] [] ? kfree_const+0x1d/0x20 [ 49.563065] [] ? kobject_set_name_vargs+0xb4/0x130 [ 49.569646] [] device_create_groups_vargs+0x1c8/0x220 [ 49.576473] [] device_create+0x88/0xa0 [ 49.582000] [] ? device_create_vargs+0x20/0x20 [ 49.588208] [] ? macvlan_set_mac_address+0x150/0x150 [ 49.594937] [] macvtap_device_event+0x1c4/0x2a0 [ 49.601250] [] notifier_call_chain+0x8b/0x170 [ 49.607395] [] raw_notifier_call_chain+0x11/0x20 [ 49.613778] [] call_netdevice_notifiers_info+0x47/0x80 [ 49.620688] [] register_netdevice+0x8e8/0xd00 [ 49.626807] [] ? netdev_change_features+0x80/0x80 [ 49.633293] [] ? dev_get_nest_level+0x10c/0x1a0 [ 49.639588] [] macvlan_common_newlink+0x8b9/0x1090 [ 49.646141] [] macvtap_newlink+0xbf/0x110 [ 49.651912] [] ? __netlink_ns_capable+0xc7/0xf0 [ 49.658206] [] rtnl_newlink+0xd4b/0x1230 [ 49.663900] [] ? rtnl_link_ops_get+0x5d/0x90 [ 49.669955] [] ? rtnl_newlink+0x319/0x1230 [ 49.675816] [] ? load_balance+0xc07/0x1ef0 [ 49.683074] [] ? rtnl_setlink+0x2f0/0x2f0 [ 49.688857] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 49.695682] [] ? __lock_acquire+0x15c3/0x5990 [ 49.701973] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 49.709021] [] ? __netlink_ns_capable+0xc7/0xf0 [ 49.715534] [] rtnetlink_rcv_msg+0x222/0x680 [ 49.721572] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 49.728388] [] ? rtnetlink_rcv+0x30/0x30 [ 49.734071] [] ? mutex_lock_nested+0x5fd/0xb30 [ 49.740288] [] ? rtnetlink_rcv+0x16/0x30 [ 49.745977] [] ? netlink_seq_start+0xe0/0xe0 [ 49.752615] [] netlink_rcv_skb+0x242/0x350 [ 49.758478] [] ? rtnetlink_rcv+0x30/0x30 [ 49.764160] [] rtnetlink_rcv+0x25/0x30 [ 49.769669] [] netlink_unicast+0x3da/0x560 [ 49.775541] [] ? netlink_sendskb+0x40/0x40 [ 49.781495] [] netlink_sendmsg+0x9bb/0xb40 [ 49.787361] [] ? nlmsg_notify+0xf0/0xf0 [ 49.792971] [] ? __might_fault+0xf1/0x1b0 [ 49.798753] [] ? nlmsg_notify+0xf0/0xf0 [ 49.804361] [] sock_sendmsg+0xb5/0xf0 [ 49.809802] [] SyS_sendto+0x1ca/0x290 [ 49.815224] [] ? SyS_getpeername+0x240/0x240 [ 49.821254] [] ? mntput_no_expire+0xce/0x600 [ 49.827301] [] ? mnt_get_count+0x1c0/0x1c0 [ 49.833157] [] ? mntput+0x52/0x70 [ 49.838451] [] ? task_work_run+0x14a/0x200 [ 49.844352] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 49.851346] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 49.857900] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 49.865910] Kernel Offset: disabled