[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 47.154773] IPVS: Creating netns size=2712 id=1 [ 47.159729] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.1.22' (ECDSA) to the list of known hosts. 2020/03/18 22:26:52 parsed 1 programs 2020/03/18 22:26:52 executed programs: 0 [ 54.909430] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 54.921452] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 54.929498] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 54.938121] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 54.946268] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 54.954115] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 54.972346] IPVS: Creating netns size=2712 id=2 [ 54.977912] IPVS: ftp: loaded support on port[0] = 21 [ 55.041516] IPVS: Creating netns size=2712 id=3 [ 55.046400] IPVS: ftp: loaded support on port[0] = 21 [ 55.175161] chnl_net:caif_netlink_parms(): no params data found [ 55.200921] IPVS: Creating netns size=2712 id=4 [ 55.205780] IPVS: ftp: loaded support on port[0] = 21 [ 55.380697] chnl_net:caif_netlink_parms(): no params data found [ 55.429401] IPVS: Creating netns size=2712 id=5 [ 55.436707] IPVS: ftp: loaded support on port[0] = 21 [ 55.622164] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.628605] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.638530] device bridge_slave_0 entered promiscuous mode [ 55.667022] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.673448] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.682515] device bridge_slave_1 entered promiscuous mode [ 55.711038] chnl_net:caif_netlink_parms(): no params data found [ 55.737770] IPVS: Creating netns size=2712 id=6 [ 55.743014] IPVS: ftp: loaded support on port[0] = 21 [ 55.816378] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 55.834849] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.841671] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.851650] device bridge_slave_0 entered promiscuous mode [ 55.880461] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.908833] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.915541] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.924356] device bridge_slave_1 entered promiscuous mode [ 56.053325] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.065835] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.239219] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 56.259229] IPVS: Creating netns size=2712 id=7 [ 56.264429] IPVS: ftp: loaded support on port[0] = 21 [ 56.308228] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.315172] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.325372] device bridge_slave_0 entered promiscuous mode [ 56.332481] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 56.375485] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.382138] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.391335] device bridge_slave_1 entered promiscuous mode [ 56.398525] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.474810] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.493935] chnl_net:caif_netlink_parms(): no params data found [ 56.596729] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.605312] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.682499] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.691166] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.755055] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 56.834002] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 56.855525] chnl_net:caif_netlink_parms(): no params data found [ 56.922020] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 56.968646] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 57.102337] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 57.202128] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 57.315518] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.322726] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.332203] device bridge_slave_0 entered promiscuous mode [ 57.365967] chnl_net:caif_netlink_parms(): no params data found [ 57.380588] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.387090] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.396116] device bridge_slave_1 entered promiscuous mode [ 57.425135] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 57.494101] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 57.608719] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.681123] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.689196] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.695707] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.704598] device bridge_slave_0 entered promiscuous mode [ 57.764122] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.771064] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.779716] device bridge_slave_1 entered promiscuous mode [ 57.896475] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.953710] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 58.068200] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 58.110436] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.116840] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.126649] device bridge_slave_0 entered promiscuous mode [ 58.134912] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.178743] ------------[ cut here ]------------ [ 58.183700] WARNING: CPU: 0 PID: 7021 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 58.191645] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 58.198769] Kernel panic - not syncing: panic_on_warn set ... [ 58.198769] [ 58.206124] CPU: 0 PID: 7021 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 58.213646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.222995] 1ffffffff0d95756 ffff8800b4baefb0 ffffffff82c74fc6 ffffffff85c81040 [ 58.231018] ffff8800b4baf088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b4baf078 [ 58.239050] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 58.247086] Call Trace: [ 58.249650] [] dump_stack+0xe6/0x120 [ 58.255013] [] ? sysfs_warn_dup+0x7b/0xa0 [ 58.260793] [] panic+0x1af/0x348 [ 58.265784] [] ? set_ti_thread_flag+0xf/0xf [ 58.271734] [] ? sysfs_warn_dup+0x7b/0xa0 [ 58.277520] [] __warn+0x18d/0x1b0 [ 58.282613] [] warn_slowpath_fmt+0x92/0xb0 [ 58.288494] [] ? __warn+0x1b0/0x1b0 [ 58.293865] [] ? kernfs_path_from_node+0x4a/0x60 [ 58.300385] [] sysfs_warn_dup+0x7b/0xa0 [ 58.306102] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 58.313099] [] sysfs_create_link+0x43/0xb0 [ 58.318960] [] device_add+0x689/0x1360 [ 58.324949] [] ? device_private_init+0x180/0x180 [ 58.331358] [] ? kfree_const+0x1d/0x20 [ 58.336895] [] ? kobject_set_name_vargs+0xb4/0x130 [ 58.343561] [] device_create_groups_vargs+0x1c8/0x220 [ 58.350389] [] device_create+0x88/0xa0 [ 58.356286] [] ? device_create_vargs+0x20/0x20 [ 58.362513] [] ? macvlan_set_mac_address+0x150/0x150 [ 58.369378] [] macvtap_device_event+0x1c4/0x2a0 [ 58.375682] [] notifier_call_chain+0x8b/0x170 [ 58.381807] [] raw_notifier_call_chain+0x11/0x20 [ 58.388188] [] call_netdevice_notifiers_info+0x47/0x80 [ 58.395104] [] register_netdevice+0x88a/0xce0 [ 58.401240] [] ? netdev_change_features+0x80/0x80 [ 58.407726] [] ? kmem_cache_alloc_trace+0x34f/0x6b0 [ 58.414492] [] ? dev_get_nest_level+0x10c/0x1a0 [ 58.420793] [] macvlan_common_newlink+0x8b9/0x1090 [ 58.427369] [] macvtap_newlink+0xbf/0x110 [ 58.433331] [] ? __netlink_ns_capable+0xc7/0xf0 [ 58.439759] [] rtnl_newlink+0xd4b/0x1230 [ 58.445581] [] ? rtnl_link_ops_get+0x5d/0x90 [ 58.451621] [] ? rtnl_newlink+0x319/0x1230 [ 58.457496] [] ? __module_text_address+0x13/0x150 [ 58.463979] [] ? is_module_text_address+0x2a/0x50 [ 58.470470] [] ? rtnl_setlink+0x2f0/0x2f0 [ 58.476245] [] ? __module_text_address+0x13/0x150 [ 58.482729] [] ? print_context_stack+0x7b/0xc0 [ 58.488940] [] ? dump_trace+0x127/0x320 [ 58.494547] [] ? __netlink_ns_capable+0xc7/0xf0 [ 58.501452] [] rtnetlink_rcv_msg+0x222/0x680 [ 58.507503] [] ? rtnetlink_rcv+0x30/0x30 [ 58.513221] [] ? mutex_lock_nested+0x638/0xb30 [ 58.519484] [] ? rtnetlink_rcv+0x16/0x30 [ 58.525175] [] ? netlink_lookup+0xd4/0x630 [ 58.531053] [] netlink_rcv_skb+0x242/0x350 [ 58.536935] [] ? rtnetlink_rcv+0x30/0x30 [ 58.542632] [] rtnetlink_rcv+0x25/0x30 [ 58.549063] [] netlink_unicast+0x455/0x660 [ 58.555056] [] ? netlink_unicast+0x3b5/0x660 [ 58.561235] [] ? netlink_attachskb+0x730/0x730 [ 58.567448] [] netlink_sendmsg+0x893/0xb40 [ 58.573402] [] ? netlink_unicast+0x660/0x660 [ 58.579527] [] ? __might_fault+0xf1/0x1b0 [ 58.585339] [] ? security_socket_sendmsg+0x6a/0xa0 [ 58.591893] [] ? netlink_unicast+0x660/0x660 [ 58.597924] [] sock_sendmsg+0xb5/0xf0 [ 58.603351] [] SYSC_sendto+0x1c9/0x300 [ 58.608879] [] ? SYSC_connect+0x2a0/0x2a0 [ 58.614662] [] ? mnt_get_count+0x1c0/0x1c0 [ 58.620536] [] ? mntput_no_expire+0xb1/0x600 [ 58.626572] [] ? mntput_no_expire+0xce/0x600 [ 58.632619] [] ? mnt_get_count+0x1c0/0x1c0 [ 58.638481] [] ? mntput+0x52/0x70 [ 58.643572] [] ? ___might_sleep+0x331/0x440 [ 58.649524] [] ? trace_hardirqs_off+0xd/0x10 [ 58.655560] [] ? exit_to_usermode_loop+0xcb/0x1c0 [ 58.662031] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 58.669201] [] SyS_sendto+0x9/0x10 [ 58.674366] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 58.682208] Kernel Offset: disabled