[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: [ 49.022826] IPVS: Creating netns size=2712 id=1 [ 49.027877] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.136' (ECDSA) to the list of known hosts. 2020/02/13 19:17:55 parsed 1 programs 2020/02/13 19:17:55 executed programs: 0 [ 56.760318] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 56.770361] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 56.780233] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 56.789448] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 56.797850] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 56.806381] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 56.823699] IPVS: Creating netns size=2712 id=2 [ 56.828644] IPVS: ftp: loaded support on port[0] = 21 [ 56.898746] IPVS: Creating netns size=2712 id=3 [ 56.903661] IPVS: ftp: loaded support on port[0] = 21 [ 57.035755] chnl_net:caif_netlink_parms(): no params data found [ 57.043158] IPVS: Creating netns size=2712 id=4 [ 57.043236] IPVS: ftp: loaded support on port[0] = 21 [ 57.260582] IPVS: Creating netns size=2712 id=5 [ 57.265854] IPVS: ftp: loaded support on port[0] = 21 [ 57.283277] chnl_net:caif_netlink_parms(): no params data found [ 57.390865] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.397794] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.406714] device bridge_slave_0 entered promiscuous mode [ 57.414616] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.421050] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.430048] device bridge_slave_1 entered promiscuous mode [ 57.575978] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.597007] IPVS: Creating netns size=2712 id=6 [ 57.602234] IPVS: ftp: loaded support on port[0] = 21 [ 57.623065] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.687082] chnl_net:caif_netlink_parms(): no params data found [ 57.875837] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.882457] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.891863] device bridge_slave_0 entered promiscuous mode [ 57.904983] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 57.931937] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.938528] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.947544] device bridge_slave_1 entered promiscuous mode [ 57.977152] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 58.020134] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.028289] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 58.045562] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 58.080180] IPVS: Creating netns size=2712 id=7 [ 58.085317] IPVS: ftp: loaded support on port[0] = 21 [ 58.095870] chnl_net:caif_netlink_parms(): no params data found [ 58.115831] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 58.299271] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 58.322569] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.329142] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.338418] device bridge_slave_0 entered promiscuous mode [ 58.376238] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 58.405941] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.412982] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.421944] device bridge_slave_1 entered promiscuous mode [ 58.607364] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 58.620319] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 58.717656] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.793145] chnl_net:caif_netlink_parms(): no params data found [ 58.808012] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 58.877221] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.884690] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.894032] device bridge_slave_0 entered promiscuous mode [ 59.025774] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.032305] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.041475] device bridge_slave_1 entered promiscuous mode [ 59.174107] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 59.186335] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.204910] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 59.234020] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.242955] chnl_net:caif_netlink_parms(): no params data found [ 59.257394] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 59.294833] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 59.434560] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 59.567557] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 59.602869] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.609298] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.618442] device bridge_slave_0 entered promiscuous mode [ 59.635806] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 59.652647] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.659300] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.668446] device bridge_slave_1 entered promiscuous mode [ 59.714787] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 59.723226] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 59.829480] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.911953] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.920128] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.926787] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.935646] device bridge_slave_0 entered promiscuous mode [ 59.988719] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.995714] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.004658] device bridge_slave_1 entered promiscuous mode [ 60.097637] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 60.137140] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 60.146041] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 60.187341] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 60.325793] ------------[ cut here ]------------ [ 60.330607] WARNING: CPU: 1 PID: 7055 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 60.338522] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 60.345567] Kernel panic - not syncing: panic_on_warn set ... [ 60.345567] [ 60.352970] CPU: 1 PID: 7055 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0 [ 60.360536] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.369880] 1ffffffff0d95756 ffff8800b6fa6fb0 ffffffff82c74fc6 ffffffff85c81040 [ 60.378039] ffff8800b6fa7088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b6fa7078 [ 60.386157] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 60.394406] Call Trace: [ 60.397116] [] dump_stack+0xe6/0x120 [ 60.402468] [] ? sysfs_warn_dup+0x7b/0xa0 [ 60.408391] [] panic+0x1af/0x348 [ 60.413402] [] ? set_ti_thread_flag+0xf/0xf [ 60.419363] [] ? sysfs_warn_dup+0x7b/0xa0 [ 60.425157] [] __warn+0x18d/0x1b0 [ 60.430249] [] warn_slowpath_fmt+0x92/0xb0 [ 60.436121] [] ? __warn+0x1b0/0x1b0 [ 60.441389] [] ? kernfs_path_from_node+0x4a/0x60 [ 60.447903] [] sysfs_warn_dup+0x7b/0xa0 [ 60.453505] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 60.460556] [] sysfs_create_link+0x43/0xb0 [ 60.466439] [] device_add+0x689/0x1360 [ 60.471959] [] ? device_private_init+0x180/0x180 [ 60.478348] [] ? kfree_const+0x1d/0x20 [ 60.483917] [] ? kobject_set_name_vargs+0xb4/0x130 [ 60.490487] [] device_create_groups_vargs+0x1c8/0x220 [ 60.497359] [] device_create+0x88/0xa0 [ 60.502941] [] ? device_create_vargs+0x20/0x20 [ 60.509162] [] ? macvlan_set_mac_address+0x150/0x150 [ 60.515896] [] macvtap_device_event+0x1c4/0x2a0 [ 60.522313] [] notifier_call_chain+0x8b/0x170 [ 60.528619] [] raw_notifier_call_chain+0x11/0x20 [ 60.535041] [] call_netdevice_notifiers_info+0x47/0x80 [ 60.541957] [] register_netdevice+0x88a/0xce0 [ 60.548094] [] ? netdev_change_features+0x80/0x80 [ 60.554577] [] ? kmem_cache_alloc_trace+0x34f/0x6b0 [ 60.561230] [] ? dev_get_nest_level+0x10c/0x1a0 [ 60.567639] [] macvlan_common_newlink+0x8b9/0x1090 [ 60.574330] [] macvtap_newlink+0xbf/0x110 [ 60.580233] [] ? __netlink_ns_capable+0xc7/0xf0 [ 60.586549] [] rtnl_newlink+0xd4b/0x1230 [ 60.592323] [] ? rtnl_link_ops_get+0x5d/0x90 [ 60.598375] [] ? rtnl_newlink+0x319/0x1230 [ 60.604250] [] ? rtnl_setlink+0x2f0/0x2f0 [ 60.610039] [] ? sched_clock_cpu+0x152/0x1e0 [ 60.616091] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 60.623316] [] ? __netlink_ns_capable+0xc7/0xf0 [ 60.629620] [] rtnetlink_rcv_msg+0x222/0x680 [ 60.635667] [] ? memset+0x28/0x30 [ 60.640903] [] ? rtnetlink_rcv+0x30/0x30 [ 60.646605] [] ? mutex_lock_nested+0x638/0xb30 [ 60.652993] [] ? rtnetlink_rcv+0x16/0x30 [ 60.658713] [] ? netlink_lookup+0xd4/0x630 [ 60.664650] [] netlink_rcv_skb+0x242/0x350 [ 60.670665] [] ? rtnetlink_rcv+0x30/0x30 [ 60.676411] [] rtnetlink_rcv+0x25/0x30 [ 60.681935] [] netlink_unicast+0x455/0x660 [ 60.687837] [] ? netlink_unicast+0x3b5/0x660 [ 60.693886] [] ? netlink_attachskb+0x730/0x730 [ 60.700116] [] netlink_sendmsg+0x893/0xb40 [ 60.705997] [] ? netlink_unicast+0x660/0x660 [ 60.712095] [] ? __might_fault+0xf1/0x1b0 [ 60.718038] [] ? security_socket_sendmsg+0x6a/0xa0 [ 60.724610] [] ? netlink_unicast+0x660/0x660 [ 60.730658] [] sock_sendmsg+0xb5/0xf0 [ 60.736104] [] SYSC_sendto+0x1c9/0x300 [ 60.741656] [] ? SYSC_connect+0x2a0/0x2a0 [ 60.747554] [] ? mnt_get_count+0x1c0/0x1c0 [ 60.753427] [] ? mntput_no_expire+0xb1/0x600 [ 60.759463] [] ? mntput_no_expire+0xce/0x600 [ 60.765510] [] ? mnt_get_count+0x1c0/0x1c0 [ 60.771389] [] ? mntput+0x52/0x70 [ 60.776707] [] ? ___might_sleep+0x331/0x440 [ 60.782668] [] ? trace_hardirqs_off+0xd/0x10 [ 60.788884] [] ? exit_to_usermode_loop+0xcb/0x1c0 [ 60.795482] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 60.802075] [] SyS_sendto+0x9/0x10 [ 60.807258] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 60.815275] Kernel Offset: disabled