[ 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: [ 35.788923] IPVS: Creating netns size=2712 id=1 [ 35.793874] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. 2020/07/22 02:30:23 parsed 1 programs 2020/07/22 02:30:23 executed programs: 0 [ 43.977147] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 43.993736] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 44.005254] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 44.013710] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 44.023373] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 44.033432] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 44.049467] IPVS: Creating netns size=2712 id=2 [ 44.054364] IPVS: ftp: loaded support on port[0] = 21 [ 44.131293] IPVS: Creating netns size=2712 id=3 [ 44.136157] IPVS: ftp: loaded support on port[0] = 21 [ 44.288363] chnl_net:caif_netlink_parms(): no params data found [ 44.321794] IPVS: Creating netns size=2712 id=4 [ 44.326748] IPVS: ftp: loaded support on port[0] = 21 [ 44.537125] chnl_net:caif_netlink_parms(): no params data found [ 44.548969] IPVS: Creating netns size=2712 id=5 [ 44.553815] IPVS: ftp: loaded support on port[0] = 21 [ 44.669165] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.676470] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.686236] device bridge_slave_0 entered promiscuous mode [ 44.745931] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.752429] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.762133] device bridge_slave_1 entered promiscuous mode [ 44.909499] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.937059] chnl_net:caif_netlink_parms(): no params data found [ 44.955389] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.987846] IPVS: Creating netns size=2712 id=6 [ 44.993094] IPVS: ftp: loaded support on port[0] = 21 [ 45.208477] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.214962] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.224881] device bridge_slave_0 entered promiscuous mode [ 45.320169] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.326741] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.337531] device bridge_slave_1 entered promiscuous mode [ 45.350866] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.424338] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 45.435976] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.460024] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.481352] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.490055] chnl_net:caif_netlink_parms(): no params data found [ 45.512008] IPVS: Creating netns size=2712 id=7 [ 45.517772] IPVS: ftp: loaded support on port[0] = 21 [ 45.526808] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.831266] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.838632] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.848588] device bridge_slave_0 entered promiscuous mode [ 45.866935] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.938299] bridge0: port 2(bridge_slave_1) entered blocking state [ 45.944791] bridge0: port 2(bridge_slave_1) entered disabled state [ 45.956737] device bridge_slave_1 entered promiscuous mode [ 45.975633] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.021903] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.063518] chnl_net:caif_netlink_parms(): no params data found [ 46.106909] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.163774] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.213993] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.327032] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 46.414408] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 46.421226] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.428223] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.437318] device bridge_slave_0 entered promiscuous mode [ 46.546063] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.552437] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.562709] device bridge_slave_1 entered promiscuous mode [ 46.746084] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.758189] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.769331] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.839472] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 46.999227] chnl_net:caif_netlink_parms(): no params data found [ 47.066425] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.073673] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.082404] device bridge_slave_0 entered promiscuous mode [ 47.166426] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.173764] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.182545] device bridge_slave_1 entered promiscuous mode [ 47.190567] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.257809] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.351369] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.384275] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.416215] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.436601] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.531292] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 47.666612] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.739956] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.775652] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.782138] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.792325] device bridge_slave_0 entered promiscuous mode [ 47.809568] ------------[ cut here ]------------ [ 47.814571] WARNING: CPU: 1 PID: 5881 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 47.822331] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 47.829343] Kernel panic - not syncing: panic_on_warn set ... [ 47.829343] [ 47.836683] CPU: 1 PID: 5881 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 [ 47.844182] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.853505] 0000000000000000 ffff8800b3f3efc8 ffffffff82c65e52 ffffffff85c81040 [ 47.861510] ffff8800b3f3f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 47.869522] ffff8800b3f3f090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3a9a [ 47.877497] Call Trace: [ 47.880057] [] dump_stack+0x136/0x1d4 [ 47.885477] [] ? sysfs_warn_dup+0x7b/0xa0 [ 47.891243] [] panic+0x1af/0x348 [ 47.896224] [] ? to_vmem_altmap+0x125/0x125 [ 47.902164] [] ? sysfs_warn_dup+0x7b/0xa0 [ 47.907931] [] __warn+0x18d/0x1b0 [ 47.912998] [] warn_slowpath_fmt+0x92/0xb0 [ 47.918853] [] ? __warn+0x1b0/0x1b0 [ 47.924095] [] ? kernfs_path_from_node+0x4a/0x60 [ 47.930466] [] sysfs_warn_dup+0x7b/0xa0 [ 47.936054] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 47.943031] [] sysfs_create_link+0x43/0xb0 [ 47.948882] [] device_add+0x677/0x1350 [ 47.954386] [] ? device_private_init+0x180/0x180 [ 47.960758] [] ? kfree_const+0x1d/0x20 [ 47.966265] [] ? kobject_set_name_vargs+0xb4/0x130 [ 47.972808] [] device_create_groups_vargs+0x1c8/0x220 [ 47.979613] [] device_create+0x88/0xa0 [ 47.985118] [] ? device_create_vargs+0x20/0x20 [ 47.991315] [] ? macvlan_set_mac_address+0x150/0x150 [ 47.998087] [] macvtap_device_event+0x1c4/0x2a0 [ 48.004371] [] notifier_call_chain+0x8b/0x170 [ 48.010483] [] raw_notifier_call_chain+0x11/0x20 [ 48.016856] [] call_netdevice_notifiers_info+0x47/0x80 [ 48.023748] [] register_netdevice+0x8e8/0xd00 [ 48.029860] [] ? netdev_change_features+0x80/0x80 [ 48.036315] [] ? dev_get_nest_level+0x10c/0x1a0 [ 48.042601] [] macvlan_common_newlink+0x8b9/0x1090 [ 48.049147] [] macvtap_newlink+0xbf/0x110 [ 48.054910] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.061195] [] rtnl_newlink+0xd4b/0x1230 [ 48.066871] [] ? rtnl_link_ops_get+0x5d/0x90 [ 48.072901] [] ? rtnl_newlink+0x319/0x1230 [ 48.078797] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 48.085517] [] ? rtnl_setlink+0x2f0/0x2f0 [ 48.091285] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 48.098005] [] ? __lock_acquire+0x1673/0x5990 [ 48.104119] [] ? cpuacct_charge+0x189/0x300 [ 48.110055] [] ? cpuacct_css_alloc+0x160/0x160 [ 48.116251] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 48.123231] [] ? __netlink_ns_capable+0xc7/0xf0 [ 48.129521] [] rtnetlink_rcv_msg+0x222/0x680 [ 48.135558] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 48.142361] [] ? rtnetlink_rcv+0x30/0x30 [ 48.148037] [] ? mutex_lock_nested+0x5fd/0xb30 [ 48.154408] [] ? rtnetlink_rcv+0x16/0x30 [ 48.160084] [] ? netlink_seq_start+0xe0/0xe0 [ 48.166110] [] netlink_rcv_skb+0x242/0x350 [ 48.171963] [] ? rtnetlink_rcv+0x30/0x30 [ 48.177640] [] rtnetlink_rcv+0x25/0x30 [ 48.183185] [] netlink_unicast+0x3da/0x560 [ 48.189059] [] ? netlink_sendskb+0x40/0x40 [ 48.194908] [] netlink_sendmsg+0x9bb/0xb40 [ 48.200758] [] ? nlmsg_notify+0xf0/0xf0 [ 48.206349] [] ? __might_fault+0xf1/0x1b0 [ 48.212113] [] ? nlmsg_notify+0xf0/0xf0 [ 48.217703] [] sock_sendmsg+0xb5/0xf0 [ 48.223120] [] SyS_sendto+0x1ca/0x290 [ 48.228536] [] ? SyS_getpeername+0x240/0x240 [ 48.234561] [] ? mntput_no_expire+0xce/0x600 [ 48.240584] [] ? mnt_get_count+0x1c0/0x1c0 [ 48.246433] [] ? mntput+0x52/0x70 [ 48.251502] [] ? task_work_run+0x14a/0x200 [ 48.257353] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 48.264159] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 48.270703] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 48.278595] Kernel Offset: disabled